2006
NATIONAL STANDARD
PLUMBING CODE
Published By
PLUMBING-HEATING-COOLING CONTRACTORS—
NATIONAL ASSOCIATION
All inquirie...
Second Printing – July 2006
FOREWORD
Since its founding as the National Association of Master Plumbers in 1883,
the National Association of Plumbing-H...
ii
NATIONAL STANDARD
PLUMBING CODE
Title:
National Standard Plumbing Code
Scope:
The development of a recommended code of pl...
iv
INTRODUCTORY NOTE
The material presented in this Code does not have legal standing unless it is adopted by
reference, or b...
2006 National Standard Plumbing Code Committee
J. Richard Wagner, PE, Chairman
The Poole & Kent Corporation
4530 Hollins F...
Contents
FOREWORD ...........................................................................................................
viii
Administration
ADM 1.1 TITLE
The regulations contained in the following chapters and sections shall be known as the “Natio...
1.4.7 Special Historic Buildings
The provisions of this Code relating to the additions, alterations, repair, replacement o...
1.6.3 Right of Entry
When inspections are required to enforce the provisions of this Code, or there is reasonable cause to...
1.7.2
Penalties
Any individual, partnership, firm or corporation who shall violate or fail to comply with any of the req...
1.9.3 Specifications
All specifications required to be on the plans shall be drawn to scale and sufficiently clear to indi...
1.10.2 Plan Review Fees
When plans are reviewed as a requirement prior to issuance of a permit, the fee shall be equal to
...
1.11.4 System Testing
All new plumbing systems and parts of existing systems shall be tested and approved as required else...
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2006 National Standard Plumbing Code
Basic Principles
This Code is founded upon certain basic principles of environmental sanitation and safety through properl...
Principle No. 8—DRAINAGE SYSTEM
The drainage system shall be designed, constructed, and maintained to guard against foulin...
Principle No. 18—PREVENT SEWER FLOODING
Where a plumbing drainage system is subject to backflow of sewage from the public ...
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2006National Standard Plumbing Code
Chapter 1
Definitions
1.1 GENERAL
For the purpose of this Code, the following terms shall have the meaning indicated in th...
Area Drain: A receptor designed to collect surface or storm water from an open area.
Aspirator: A fitting or device suppli...
Branch, Fixture: See “Fixture Branch”
Branch, Horizontal: See “Horizontal Branch Drain”
Branch Interval: A distance along ...
Clear Water Waste: Effluent in which impurity levels are less than concentrations considered harmful by the
Authority Havi...
Day Nursery: A facility for the care of children less than 2-1/2 years of age.
Dead End, Potable Water: A branch line term...
Dwelling Unit, Single: A room, or group of rooms, forming a single habitable unit with facilities that are used, or
intend...
Flooded: The condition that results when the liquid in a receptor or fixture rises to the flood level rim.
Flow Pressure: ...
Health Hazard In backflow prevention, an actual or potential threat of contamination of the potable water supply
to the pl...
Loop Vent: See “Vent, Loop”
Low Hazard: See “Hazard, Low”
Macerating Toilet System: A system that collects drainage from a...
Pitch: See “Grade”
Plenum: An enclosed portion of the building structure, other than an occupiable space being conditioned...
Plumbing Inspector: See “Authority Having Jurisdiction”
Plumbing System: Includes the water supply and distribution pipes,...
Pump Assisted Water Closet: See Water Closet, Pump Assisted.
Receptor: A fixture or device that receives the discharge fro...
Service Sink: A sink or receptor intended for custodial use that is capable of being used to fill and empty a
janitor's bu...
Special Waste Pipe: Pipes that convey special wastes.
Stack: A general term for any vertical line including offsets of soi...
Trap: A fitting or device that provides a liquid seal to prevent the emission of sewer gasses without materially
affecting...
Vent, Side: A vent connecting to a drain pipe through a fitting at an angle not greater than 45° to the vertical.
Vent, St...
Water Outlet: A discharge opening through which water is supplied to a fixture, into the atmosphere (except into
an open t...
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30
2006 National Standard Plumbing Code
Chapter 2
General Regulations
2.1
RESERVED
2.2
RESERVED
2.3
CHANGES IN DIRECTION OF DRAINAGE PIPING
2.3.1 Uses for Dr...
PIPE
MATERIAL
CAST IRON
HUB
&
SPIGOT
CAST IRON
NO-HUB
CAST IRON
DRAINAGE
(threaded)
COPPER
DWV
PLASTIC
DWV
STAINLESS
...
2.4.3 Obstruction to Flow
a. No fitting, connection, device, or method of installation that obstructs or retards the flow ...
2.6.4 Final Backfill
The trench shall be backfilled from the top of the compacted initial backfill to finish grade using s...
2.7 SAFETY
Any part of a building or premise that is changed, altered, or required to be replaced as a result of the insta...
2.11 PIPING MATERIALS EXPOSED WITHIN PLENUMS:
All piping materials exposed within plenums shall comply with the provisions...
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National standard plumbing code

National Standard Plumbing Code
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  • 1. 2006 NATIONAL STANDARD PLUMBING CODE Published By PLUMBING-HEATING-COOLING CONTRACTORS— NATIONAL ASSOCIATION All inquiries or questions relating to interpretation should be forwarded to Code Secretary 180 S. Washington St., P.O. Box 6808 Falls Church, VA 22046-1148 1-800-813-7061 © 2006 Plumbing-Heating-Cooling Contractors–National Association To order additional books call 1-800-533-7694 (if calling from New Jersey call 1-800-652-7422)
  • 2. Second Printing – July 2006
  • 3. FOREWORD Since its founding as the National Association of Master Plumbers in 1883, the National Association of Plumbing-Heating-Cooling Contractors has maintained a serious interest in plumbing standards, codes and good plumbing design practices. The Association published the NAMP “Standard Plumbing Code” in 1933 and furnished revised editions until 1942. NAPHCC participated in the development of special standards for war-time plumbing and later was represented on the National Plumbing Code Coordinating Committee, whose work ultimately resulted in the adoption of A40.8 as a standard or model plumbing code in 1955. NAPHCC served as a sponsor in the early 1960’s of the project which attempted to update the 1955 document. This project was operated through the procedures of the American National Standards Institute. However, the A40.8 revision project was not completed because consensus could not be achieved. In order to provide local and state governments, code administrative bodies and industry with a modern, updated code, NAPHCC published the “National Standard Plumbing Code,” in 1971, following the format and sequence of the A40.8 to provide for maximum convenience of users. With the June 1973 revision, the American Society of Plumbing Engineers joined this effort by co-sponsoring the National Standard Plumbing Code. ASPE maintained its co-sponsorship status until September, 1980. Upon ASPE’s withdrawal of co-sponsorship, the Code Committee composition was changed to include not only members of the contracting and engineering communities but also members of the inspection community. Contractors, engineers and inspectors now comprise the National Standard Plumbing Code Committee. i
  • 4. ii
  • 5. NATIONAL STANDARD PLUMBING CODE Title: National Standard Plumbing Code Scope: The development of a recommended code of plumbing practice, design, and installation, including the establishment of performance criteria predicated on the need for protection of health and safety through proper design, installation, and maintenance of plumbing systems. This scope excludes the development of specific standards related to the composition, dimensions, and/or mechanical and physical properties of materials, fixtures, devices, and equipment used or installed in plumbing systems. Purpose: To provide practices and performance criteria for the protection of health and safety through proper design of plumbing systems. Exceptions: In case of practical difficulty, unnecessary hardship or new developments, exceptions to the literal requirements may be granted by the authority having jurisdiction to permit the use of other devices or methods, but only when it is clearly evident that equivalent protection is thereby secured. iii
  • 6. iv
  • 7. INTRODUCTORY NOTE The material presented in this Code does not have legal standing unless it is adopted by reference, or by inclusion, in an act of state, county, or municipal government. Therefore, administration of the provisions of this Code must be preceded by suitable legislation at the level of government where it is desired to use this Code. In some places in this Code, reference is made to “Authority Having Jurisdiction.” The identity of an Authority Having Jurisdiction will be established by the act which gives legal standing to the Code provisions. Meetings for purposes of review and revision are scheduled each year with proper public notices. Suggestions and requests for revisions can be made by any interested party and should be submitted on the special forms provided by the Committee. Personal appearance before the Committee for a hearing on any Code matter can be had by interested parties after a request in writing. In the course of revision, certain outdated sections have been deleted. In order to maintain consistency and perpetuity of the numbering system, those deleted sections and numbers have been removed from this printed text, or placed in reserve. All changes from the previous edition of this Code are marked by a vertical line in the margin. v
  • 8. 2006 National Standard Plumbing Code Committee J. Richard Wagner, PE, Chairman The Poole & Kent Corporation 4530 Hollins Ferry Rd Baltimore, MD 212-27-4670 Phone: (410) 247-2200 Fax: (410) 247-2331 Dick_Wagner@emcorgroup.com Luis A. Rodriguez, C.P.D. KSI Professional Engineers P.O. Box 628 Farmingdale, NJ 07727 Phone: (732) 938.2666 Fax: (732) 938.2661 E-mail: lrodriguez@ksi-pe.com Charlie Chalk E-B-L Engineers, LLC 8005 Harford Rd Baltimore, MD 21234-5701 Phone: (410) 668-8000 Fax: (410) 668-8001 cchalk@eblengineers.com Ronald W. Stiegler Phoenix Plumbers, Inc. 5320-J Enterprise St. Eldersburg, MD 21784-9313 Phone: (410) 781-3000 Fax: (410) 781-6826 phoenixplumbers@erols.com William Chamberlin Chamberlin Plbg. & Htg Company P.O. Box 390 1274 Route 130 South Windsor, NJ 08561 Phone: (609) 448-1848 Fax: (609) 448-8683 Alex Tucciarone Old Bridge Plumbing Inspector 58 Lear Ct East Brunswick, NJ 08816-1853 Phone: (732) 721-5600 2420 Fax: (732) 607-7912 ajtuccia@oldbridge.com Michael J. Kastner Kastner Plumbing & Heating 12630 Friendship Road West Friendship, MD 21794 Phone: (301) 725-5000 Fax: (410) 442-7626 mjkjr@aol.com Jerry Van Pelt, CIPE Clive Samuels & Associates, Inc. 4000 Route 66 Tinton Falls, NJ 07753 Phone: (732) 643-9666 Fax: (732) 643-9667 jvp@csa-ce.com Leon LaFreniere City of Manchester, Dept. of Buildings One City Plaza Manchester, NH 03101 Phone: (603) 624-6475 Fax: (603) 624-6324 llafreniere@ci.manchester.nh.us Dave Viola Plumbing Manufacturers Institute 1340 Remington Rd., Suite A Schaumburg, IL 60173 Phone: (847) 884-9764 Fax: (847) 884-9775 dviola@pmihome.org Frank R. Maddalon F. R. Maddalon Plumbing & Heating 1550 Sylvan Ave Hamilton, NJ 08610-4461 Phone: (609) 587-8317 Fax: (609) 587-9848 fmaddalon@aol.com Robert Kordulak NSPC Secretariat The Arkord Company 206 1st Ave., # 603 Belmar, NJ 07719-2006 Phone: (732) 681-5400 Fax: (732) 681-5047 bkord3565@optonline.net Thomas C. Pitcherello NJ Department of Community Affairs Codes Assistance Unit 101 S. Broad Street, PO Box 802 Trenton, NJ 08625-0802 Phone: (609) 984-7609 Fax: (609) 984-7717 tpitcherello@dca.state.nj.us Frank R. Maddalon Executive Committee Liaison F. R. Maddalon Plumbing & Heating 1550 Sylvan Ave Hamilton, NJ 08610-4461 Phone: (609) 587-8317 Fax: (609) 587-9848 fmaddalon@aol.com vi Julie A. Turner Staff Liaison Plumbing-Heating-Cooling Contractors–National Association 180 S. Washington St., Falls Church, VA 22046 (703) 237-8100 or (800) 533-7694 Fax: (703) 237-7442 e-mail: turner@naphcc.org URL: http://www.phccweb.org
  • 9. Contents FOREWORD ............................................................................................................................................ i INTRODUCTORY NOTE ...................................................................................................................... v ADMINISTRATION ................................................................................................................................ 1 BASIC PRINCIPLES .............................................................................................................................. 9 CHAPTER 1 —Definitions ........................................................................................................ 13 CHAPTER 2 —General Regulations .......................................................................................... 31 CHAPTER 3 —Materials .......................................................................................................... 39 CHAPTER 4 —Joints and Connections ..................................................................................... 65 CHAPTER 5 —Traps, Cleanouts and Backwater Valves ........................................................... 73 CHAPTER 6 —Interceptors ...................................................................................................... 79 CHAPTER 7 —Plumbing Fixtures, Fixture Fittings and Plumbing Appliances .............................. 85 CHAPTER 8 —Hangers and Supports ................................................................................... 105 CHAPTER 9 —Indirect Waste Piping and Special Wastes ...................................................... 107 CHAPTER 10 —Water Supply and Distribution ....................................................................... 113 CHAPTER 11 —Sanitary Drainage Systems ............................................................................. 137 CHAPTER 12 —Vents and Venting ......................................................................................... 147 CHAPTER 13 —Storm Water Drainage ................................................................................... 161 CHAPTER 14 —Special Requirements for Health Care Facilities .............................................. 171 CHAPTER 15 —Tests and Maintenance .................................................................................. 177 CHAPTER 16 —Regulations Governing Individual Sewage Disposal Systems for Homes and Other Establishments Where Public Sewage Systems Are Not Available ................................................... 181 CHAPTER 17 —Potable Water Supply Systems ...................................................................... 195 CHAPTER 18 —Mobile Home & Travel Trailer Park Plumbing Standards ............................................................................. 201 APPENDIX A —Sizing Storm Drainage Systems ...................................................................... 209 APPENDIX B —Sizing the Building Water Supply System ........................................................ 217 APPENDIX C —Conversions: Customary Units to Metric ........................................................ 253 APPENDIX D —Determining the Minimum Number of Required Plumbing Fixtures ................................................................................. 255 APPENDIX E —Special Design Plumbing Systems ................................................................... 261 APPENDIX F —Requirements of the Authority Having Jurisdiction .......................................... 269 APPENDIX G —Graywater Recycling Systems ......................................................................... 271 APPENDIX H —Installation of Medical Gas and Vacuum Piping Systems ................................. 275 APPENDIX I —Fixture Unit Value Curves for Water Closets .................................................. 277 APPENDIX J —Sizing Grease Interceptors ............................................................................. 281 APPENDIX K —Flow in Sloping Drains .................................................................................. 283 APPENDIX L —An Acceptable Brazing Procedure for General Plumbing ................................ 287 INDEX —Alphabetical Index ........................................................................................ 295 vii
  • 10. viii
  • 11. Administration ADM 1.1 TITLE The regulations contained in the following chapters and sections shall be known as the “National Standard Plumbing Code" and may be cited as such, and hereinafter referred to as “this Code”. ADM 1.2 SCOPE The provisions of this Code shall apply to every installation, including the erection, installation, alteration, relocation, repair, replacement, addition to, use or maintenance of the plumbing system as defined within this Code. ADM 1.3 PURPOSE This Code establishes the minimum requirements and standards pertaining to the design, installation, use and maintenance of the plumbing system as defined within this Code. ADM 1.4 APPLICABILITY 1.4.1 Addition or Repair Additions, alterations or repairs in compliance to this Code may be made to any existing plumbing system without requiring the existing installation to comply with all the requirements of this Code. Additions, alterations or repairs shall not cause an existing system to become unsafe, insanitary or overloaded. 1.4.2 Existing Plumbing Installation Plumbing systems that were lawfully installed prior to the adoption of this Code may continue their use, maintenance or repairs, provided the maintenance or repair is in accordance with the original design, location, and no hazard has been created to life, health or property by such plumbing system. 1.4.3 Existing Use The lawful use of any plumbing installation, appliances, fixtures, fittings and appurtenances may have their use continued, provided no hazards to life, health or property have been created by their continued use. 1.4.4 Maintenance and Repairs The maintenance of all plumbing systems, materials, appurtenances, devices or safeguards, both existing and new, shall be maintained in a safe and proper condition. The owner, or his designated agent, shall be responsible for the maintenance of the plumbing system. Minor repairs to or replacement of any existing systems are permitted, provided they are made in the same manner and arrangement as the original installation and are approved. 1.4.5 Change of Building Use The plumbing systems of any building or structure that is proposed for a change in use or occupancy shall comply to all the requirements of this Code for the new use or occupancy. 1.4.6 Moved Buildings or Structures The plumbing system in any building or structure to be moved into this jurisdiction shall comply with the provisions of this Code for new construction. 2006 National Standard Plumbing Code 1
  • 12. 1.4.7 Special Historic Buildings The provisions of this Code relating to the additions, alterations, repair, replacement or restoration of those structures designated as historic buildings shall not be mandatory when such work is deemed to be safe and in the public interest of health, safety and welfare by the Authority Having Jurisdiction. 1.4.8 Appendices The provisions in the appendices are intended to supplement the requirements of this Code and are considered to be part of this Code when adopted by the Authority Having Jurisdiction ADM 1.5 APPROVALS 1.5.1 Alternates The provisions cited in this Code are not intended to prevent the use of any material or method of installation when it is determined to meet the intent of this Code and approved by the Authority Having Jurisdiction 1.5.2 Authority Having Jurisdiction The Authority Having Jurisdiction may approve any such alternate material or method of installation not expressly conforming to the requirements of this Code, provided it finds the proposed material or method of installation is at least the equivalent of that required in the Code or that the alternate material or method of installation conforms to other nationally accepted plumbing standards. A record of such approval shall be kept and shall be available to the public. 1.5.3 Tests Required The Authority Having Jurisdiction shall require sufficient evidence to substantiate any claims made regarding the equivalency of any proposed alternate material or method of installation. When the Authority Having Jurisdiction determines that there is insufficient evidence to substantiate the claims, it may require tests to substantiate the claims be made by an approved testing agency at the expense of the applicant. 1.5.4 Test Procedure The Authority Having Jurisdiction shall require all tests be made in accordance with approved standards; but, in the absence of such standards, the Authority Having Jurisdiction shall specify the test procedure. 1.5.5 Retesting The Authority Having Jurisdiction may require any tests to be repeated if, at any time, there is reason to believe that any material or method of installation no longer conforms to the requirements on which the original approval was based. ADM 1.6 ORGANIZATION AND ENFORCEMENT 1.6.1 Authority Having Jurisdiction The Authority Having Jurisdiction shall be the individual official, board, department or agency duly appointed by the jurisdiction as having the authority to administer and enforce the provisions of this Code as adopted or amended. 1.6.2 Deputies In accordance with the procedures set forth by the jurisdictional authority, the Authority Having Jurisdiction may appoint such assistants, deputies, inspectors or other designated employees to carry out the administration and enforcement of this Code. 2 2006 National Standard Plumbing Code
  • 13. 1.6.3 Right of Entry When inspections are required to enforce the provisions of this Code, or there is reasonable cause to believe there exists in any building, structure or premises, any condition or violation of this Code causing the building, structure or premises to be unsafe, insanitary, dangerous or hazardous, the Authority Having Jurisdiction or its designated representative may enter such building, structure or premises at reasonable times to inspect or perform the duties imposed by this Code. When the building, structure or premises are occupied, proper credentials shall be presented to the occupant when entry is required. In the event the building, structure or premises is unoccupied, and entry is required, a reasonable effort shall be made to locate the owner or his agent in charge of such building, structure or premises. In the event the occupant or owner of such building, structure or premises refuses entry, the Authority Having Jurisdiction shall have recourse to the remedies provided by law to gain entry. 1.6.4 Stop Work Order Upon notice from the Authority Having Jurisdiction, work being done on any building, structure or premises contrary to the provisions of this Code, or in an unsafe and dangerous manner, shall be stopped immediately. The stop work notice shall be in writing, served on the owner of the property, or his agent, or to the person doing such work. It shall state the conditions under which the Authority Having Jurisdiction may grant authorization to proceed with the work. 1.6.5 Authority to Condemn When the Authority Having Jurisdiction determines that any plumbing system or portion thereof that is regulated by this Code has become insanitary or hazardous to life, health or property, it shall order in writing that such plumbing system or portion thereof be repaired, replaced or removed so as to be in code compliance. The written order shall fix a reasonable time limit for the work to be brought into code compliance, and no person shall use the condemned plumbing system until such work is complete and approved by the Authority Having Jurisdiction. 1.6.6 Authority to Abate Any plumbing system, or portion thereof that is found to be insanitary or constitute a hazard to life, health or property is hereby declared to be a nuisance. Where a nuisance exists, the Authority Having Jurisdiction shall require the nuisance to be abated and shall seek such abatement in the manner prescribed by law. 1.6.7 Liability The Authority Having Jurisdiction, or any individual duly appointed or authorized by the Authority Having Jurisdiction to enforce this Code, acting in good faith and without malice, shall not thereby be rendered personally liable for any damage that may occur to persons or property as a result of any act, or by reason of any act or omission in the lawful discharge of his duties. Should a suit be brought against the Authority Having Jurisdiction or duly appointed representative because of such act or omission, it shall be defended by legal counsel provided by this jurisdiction until final termination of the proceedings. 1.6.8 Work Prior to Permit Where work for which a permit is required by this Code is started prior to obtaining the prescribed permit, the applicant shall pay a double fee. In the event of an emergency where it is absolutely necessary to perform the plumbing work immediately, such as nights, weekends or holidays, said fee shall not be doubled if a permit is secured at the earliest possible time after the emergency plumbing work has been performed. ADM 1.7 VIOLATIONS AND PENALTIES 1.7.1 Violations It shall be unlawful for any individual, partnership, firm or corporation to, or cause to, install, construct, erect, alter, repair, improve, convert, move, use or maintain any plumbing system in violation of this Code. 2006 National Standard Plumbing Code 3
  • 14. 1.7.2 Penalties Any individual, partnership, firm or corporation who shall violate or fail to comply with any of the requirements , and if convicted, shall be punishable by a fine or imprisonment of this Code shall be deemed guilty of a or both as established by this jurisdiction. Each day during which a violation occurs or continues, shall constitute a separate offense. ADM 1.8 PERMITS 1.8.1 Permits Required It shall be unlawful for any individual, partnership, firm or corporation to commence, or cause to commence, any installation, alteration, repair, replacement, conversion or addition to any plumbing system, or part thereof, regulated by this Code, except as permitted in Section 1.8.2, without first obtaining a plumbing permit for each separate building or structure, on forms prepared and provided by the Authority Having Jurisdiction. 1.8.2 Permits Not Required for the Following a. Permits shall not be required for the following work: 1. The stoppage of leaks in drains, soil, waste or vent pipes. However, should the defect necessitate removal and replacement with new material, it shall constitute new work and a permit shall be obtained and inspection made as required in this Code. 2. The clearing of stoppages. 3. The repairing of leaks in valves or fixtures. 4. The removing and reinstallation of a water closet for a cleanout opening provided the reinstallation does not require replacement or rearrangement of valves, pipes or new fixtures. b. Exemptions from obtaining a permit required by this Code shall not be construed as to authorize any work to be performed in violation of this Code. ADM 1.9 PROCESS FOR OBTAINING PERMITS 1.9.1 Application a. Applications for a permit shall be made in writing by the person, or his agent, proposing to do such work covered by the permit. The applicant shall file such application in writing on a form prepared and provided by the Authority Having Jurisdiction. Every such permit shall: 1. Describe in detail the work to be done for which the permit was obtained. 2. Describe in detail the parcel of land on which the proposed work is to be done by legal description, street address or other means to definitely locate the site or building where the work is to be performed. 3. List the type of occupancy or use. 4. Provide plans, drawings, diagrams, calculations or other data as required by Section 1.9.2. 5. Be signed by the person or agent making application. 6. Provide any other information the Authority Having Jurisdiction may require. 1.9.2 Plans Two or more sets of plans shall be submitted with each permit application. The plans shall contain all the engineering calculations, drawings, diagrams and other data as required for approval. The Authority Having Jurisdiction may also require that the plans, drawings, diagrams and calculations be designed by an engineer and/or architect licensed by the state in which the work is to be performed. Except that the Authority Having Jurisdiction may waive the submission of plans and other data, provided it is determined that the nature of the work covered by the permit does not require plan review to obtain code compliance. 4 2006 National Standard Plumbing Code
  • 15. 1.9.3 Specifications All specifications required to be on the plans shall be drawn to scale and sufficiently clear to indicate the nature, location and extent of the proposed work so as to show how it will conform to the requirements of this Code. 1.9.4 Permit Issuance If, after reviewing the plans and specifications, the Authority Having Jurisdiction finds that they are complete and conform to the requirements of this Code, it shall authorize a permit to be issued upon payment of all the fees specified in Section 1.10.1. 1.9.5 Approved Plans When the Authority Having Jurisdiction issues a permit and plans were required, it shall endorse, either in writing or stamp the plans “APPROVED”, and all work shall be done in accordance with the plans without deviation. 1.9.6 Plans Retention The Authority Having Jurisdiction shall retain one set of approved plans until final approval of the work contained therein. One set of approved plans shall be returned to the applicant and this set of approved plans shall be kept on the job site at all times until final approval of the work contained therein. 1.9.7 Permit Validity The issuance of a permit by the Authority Having Jurisdiction is not and shall not be construed to be authorization or approval of any violation of the requirements of this Code. Any presumption of a permit to be authorization to violate or cancel any provisions of this Code shall be invalid. The issuance of a permit based on plans submitted shall not prevent the Authority Having Jurisdiction from requiring the correction of any errors in the plans or preventing the progress of the construction when it is in violation of any provision of this Code. 1.9.8 Permit Expiration Every permit issued by the Authority Having Jurisdiction, in accordance with the provisions of this Code, shall expire by limitation and become null and void when such work authorized by the permit has not commenced within days from the date of issuance or if such work is suspended or abandoned for a period of days after commencement of such work. In order for such work to recommence, a new permit shall be obtained and a fee of percent of the original permit fee shall be charged, provided no changes have been made or will be made to the original plans as submitted. The Authority Having Jurisdiction may grant an extension to any permit provided the request is in writing by the permittee stating the reason or circumstances that prevented him from completing such work as required by this Code. 1.9.9 Revocation or Suspension At any time, the Authority Having Jurisdiction may suspend or revoke a permit issued in error or on the basis of incorrect information submitted or in violation of any section of this Code. The suspension or revocation of such permit shall be in written form by the Authority Having Jurisdiction stating the reason or purpose of such suspension or revocation. ADM 1.10 PERMITS 1.10.1 Fees Schedule The permit fees for all plumbing work shall be set forth by the Authority Having Jurisdiction of the jurisdiction having authority. 2006 National Standard Plumbing Code 5
  • 16. 1.10.2 Plan Review Fees When plans are reviewed as a requirement prior to issuance of a permit, the fee shall be equal to of the total permit fee as set forth in Section 1.10.1. percent 1.10.3 Plan Review Expiration Permit application and plan review for which no permit is issued shall expire by limitation within days following the date of application. All plan review fees shall be forfeited and the plans may be destroyed by the Authority Having Jurisdiction or returned to the applicant. l.10.4 Work Without a Permit When any plumbing work is commenced without first obtaining a permit from the Authority Having Jurisdiction, an investigation of such work shall be made before a permit may be issued. The investigation fee shall be collected whether or not a permit is then or subsequently issued. Any investigation fee shall equal the amount of the permit fee, if a permit were to be issued in accordance with this Code. If the investigation fee is collected, it shall not exempt any person from compliance or penalties set forth in this Code. 1.10.5 Refunding of Fees Any fee collected by the Authority Having Jurisdiction that was erroneously paid or collected may be refunded, provided not more than percent of the fee payment shall be refunded when no work has been done. Any request for the refunding of any fee shall be in writing by the applicant no later than days after the date of fee payment. ADM 1.11 INSPECTIONS 1.11.1 Required Inspections All new plumbing systems, and parts of existing systems that require a permit shall be tested and inspected by the Authority Having Jurisdiction prior to being covered or concealed. Where any such work has been covered or concealed, the Authority Having Jurisdiction shall require such work exposed for inspection and testing. All equipment, material and labor required for testing the plumbing system shall be furnished by the permittee. The Authority Having Jurisdiction shall not be liable for any expense incurred by the removal or replacement of materials required to permit inspection or testing. Such expense is the responsibility of the permittee. Upon completion of the rough plumbing installation, prior to covering or concealing any such work, the Authority Having Jurisdiction shall inspect the work and any such test, as prescribed hereinafter, to disclose any leaks or defects. After completion of the plumbing system and the plumbing fixtures are set and their traps filled with water, a final inspection shall be conducted as required by this Code. Additional inspections may be required when alternate materials or methods of installation are approved by the Authority Having Jurisdiction. 1.11.2 Exception: For moved-in or relocated structures, minor installations and repairs, the Authority Having Jurisdiction may make other such inspections or tests as necessary to assure that the work has been performed and is safe for use in accordance with the intent of this Code. 1.11.3 Use of Existing Plumbing The operation of any plumbing installation to replace existing systems or fixtures serving an occupied portion of any building or structure shall not be considered by the requirements of this Code to prohibit such operation, provided a request for inspection has been made to the Authority Having Jurisdiction within 48 hours of such work and before any such work is covered or concealed. 6 2006 National Standard Plumbing Code
  • 17. 1.11.4 System Testing All new plumbing systems and parts of existing systems shall be tested and approved as required elsewhere in this Code. 1.11.5 Requests for Inspection The Authority Having Jurisdiction shall be notified by the person doing the work, authorized by the permit, that such work is subjected to the required tests and is ready for inspection. The method of request, whether in writing or by telephone, shall be established by the Authority Having Jurisdiction. It shall be the duty of the permittee doing the work authorized by a permit to provide reasonable access and means for accomplishing proper inspections. 1.11.6 Other Inspections The Authority Having Jurisdiction may require other inspections, in addition to those required by this Code, of any plumbing work in order to ascertain compliance with the requirements of this Code. 1.11.7 Reinspection Fees a. The assessment of a reinspection fee may be required for any of the following: 1. For any portion of work not completed for which inspection was requested. 2. For any required corrections that have not been completed and for which reinspection was requested. 3. For not having the approved plans on site and readily available to the inspector. 4. Failure to provide access for inspection on the date inspection was requested. 5. Deviation from the approved plans that would require reapproval of the Authority Having Jurisdiction. 6. Failure to provide correct address. b. This provision is intended to control the practice of calling for inspections prior to having work ready for inspection and not for the first time job rejection for not complying with the installation requirements. c. Upon the assessment of a reinspection fee, the applicant shall pay the reinspection fee in accordance with Section 1.10.1 and no additional inspections shall be performed until all fees have been paid. ADM 1.12 FINAL CONNECTIONS 1.12.1 Energy or Fuel It shall be unlawful for any person to make, or cause to make, any connection to any source of energy or fuel to any plumbing system or equipment regulated by this Code prior to the approval of the Authority Having Jurisdiction. 1.12.2 Water and Sewer It shall be unlawful for any person to make, or cause to make, any connection to any water supply or sewer system to any plumbing system or equipment regulated by this Code prior to the approval of the Authority Having Jurisdiction. 1.12.3 Temporary Connection By authorization of the Authority Having Jurisdiction, a temporary connection may be made to any plumbing equipment to a source of energy or fuel for testing purposes only. ADM 1.13 UNCONSTITUTIONALITY Should any chapter, section, subsection, sentence, clause or phrase of this Code be held for any reason as unconstitutional, such decision shall not affect the validity of the remaining chapters, sections, subsections, sentences, clause or phrases of this Code. 2006 National Standard Plumbing Code 7
  • 18. Blank Page 8 2006 National Standard Plumbing Code
  • 19. Basic Principles This Code is founded upon certain basic principles of environmental sanitation and safety through properly designed, acceptably installed, and adequately maintained plumbing systems. Some of the details of plumbing construction may vary but the basic sanitary and safety principles desirable and necessary to protect the health of the people are the same everywhere. The establishment of trade jurisdictional areas is not within the scope of this Code. This inclusion of material, even though indicated as approved for purposes of this Code, does not infer unqualified endorsement as to its selection or serviceability in any or every installation. As interpretations may be required, and as unforeseen situations arise which are not specifically covered in this Code, the twenty-two principles which follow shall be used to define the intent. Principle No. 1—ALL OCCUPIED PREMISES SHALL HAVE POTABLE WATER All premises intended for human habitation, occupancy, or use shall be provided with a supply of potable water. Such a water supply shall not be connected with unsafe water sources, nor shall it be subject to the hazards of backflow. Principle No. 2—ADEQUATE WATER REQUIRED Plumbing fixtures, devices, and appurtenances shall be supplied with water in sufficient volume and at pressures adequate to enable them to function properly and without undue noise under normal conditions of use. Principle No. 3—HOT WATER REQUIRED Hot water shall be supplied to all plumbing fixtures which normally need or require hot water for their proper use and function. Principle No. 4—WATER CONSERVATION Plumbing shall be designed and adjusted to use the minimum quantity of water consistent with proper performance and cleaning. Principle No. 5—SAFETY DEVICES Devices for heating and storing water shall be so designed and installed as to guard against dangers from explosion or overheating. Principle No. 6—USE PUBLIC SEWER WHERE AVAILABLE Every building with installed plumbing fixtures and intended for human habitation, occupancy, or use, and located on premises where a public sewer is on or passes said premises within a reasonable distance, shall be connected to the sewer. Principle No. 7—REQUIRED PLUMBING FIXTURES Each family dwelling unit shall have at least one water closet, one lavatory, one kitchen-type sink, and one bathtub or shower to meet the basic requirements of sanitation and personal hygiene. All other structures for human habitation shall be equipped with sufficient sanitary facilities. Plumbing fixtures shall be made of durable, smooth, non-absorbent and corrosion resistant material and shall be free from concealed fouling surfaces. 2006 National Standard Plumbing Code 9
  • 20. Principle No. 8—DRAINAGE SYSTEM The drainage system shall be designed, constructed, and maintained to guard against fouling, deposit of solids and clogging, and with adequate cleanouts so arranged that the pipes may be readily cleaned. Principle No. 9—DURABLE MATERIALS AND GOOD WORKMANSHIP The piping of the plumbing system shall be of durable material, free from defective workmanship and so designed and constructed as to give satisfactory service for its reasonable expected life. Principle No. 10—FIXTURE TRAPS Each fixture directly connected to the drainage system shall be equipped with a liquid seal trap. Principle No. 11—TRAP SEALS SHALL BE PROTECTED The drainage system shall be designed to provide an adequate circulation of air in all pipes with no danger of siphonage, aspiration, or forcing of trap seals under conditions of ordinary use. Principle No. 12—EXHAUST FOUL AIR TO OUTSIDE Each vent terminal shall extend to the outer air and be so installed as to minimize the possibilities of clogging and the return of foul air to the building. Principle No. 13—TEST THE PLUMBING SYSTEM The plumbing system shall be subjected to such tests as will effectively disclose all leaks and defects in the work or the material. Principle No. 14—EXCLUDE CERTAIN SUBSTANCES FROM THE PLUMBING SYSTEM No substance which will clog or accentuate clogging of pipes, produce explosive mixtures, destroy the pipes or their joints, or interfere unduly with the sewage-disposal process shall be allowed to enter the building drainage system. Principle No. 15—PREVENT CONTAMINATION Proper protection shall be provided to prevent contamination of food, water, sterile goods, and similar materials by backflow of sewage. When necessary, the fixture, device, or appliance shall be connected indirectly with the building drainage system. Principle No. 16—LIGHT AND VENTILATION No water closet or similar fixture shall be located in a room or compartment which is not properly lighted and ventilated. Principle No. 17—INDIVIDUAL SEWAGE DISPOSAL SYSTEMS If water closets or other plumbing fixtures are installed in buildings where there is no sewer within a reasonable distance, suitable provision shall be made for disposing of the sewage by some accepted method of sewage treatment and disposal. 10 2006National Standard Plumbing Code
  • 21. Principle No. 18—PREVENT SEWER FLOODING Where a plumbing drainage system is subject to backflow of sewage from the public sewer or private disposal system, suitable provision shall be made to prevent its overflow in the building. Principle No. 19—PROPER MAIN TENANCE Plumbing systems shall be maintained in a safe and serviceable condition from the standpoint of both mechanics and health. Principle No. 20—FIXTURES SHALL BE ACCESSIBLE All plumbing fixtures shall be so installed with regard to spacing as to be accessible for their intended use and for cleaning. Principle No. 21—STRUCTURAL SAFETY Plumbing shall be installed with due regard to preservation of the strength of structural members and prevention of damage to walls and other surfaces through fixture usage. Principle No. 22—PROTECT GROUND AND SURFACE WATER Sewage or other waste shall not be discharged into surface or sub-surface water unless it has first been subjected to some acceptable form of treatment. 2006 National Standard Plumbing Code 11
  • 22. Blank Page 12 2006National Standard Plumbing Code
  • 23. Chapter 1 Definitions 1.1 GENERAL For the purpose of this Code, the following terms shall have the meaning indicated in this chapter. No attempt is made to define ordinary words that are used in accordance with their established dictionary meaning, except where it is necessary to define their meaning as used in this Code to avoid misunderstanding. 1.2 DEFINITION OF TERMS Accessible and Readily Accessible: Accessible: access thereto without damaging building surfaces, but that first may require the removal of an access panel, door or similar obstructions with the use of tools. Readily accessible: access without requiring the use of tools for removing or moving any panel, door or similar obstruction. Acid Waste: See “Special Wastes” Adopting Agency (See also “Authority Having Jurisdiction”) The agency, board or authority having the duty and power to establish the plumbing code that will govern the installation of all plumbing work to be performed in the jurisdictions. Air Break (drainage system): A piping arrangement in which a drain from a fixture, appliance, or device discharges into a fixture, receptor, or interceptor at a point below the flood level rim and above the trap seal of the receptor. Air Chamber: A pressure surge absorbing device operating through the compressibility of air. Air Gap (drainage system): The unobstructed vertical distance through the free atmosphere between the outlet of the waste pipe and the flood level rim of the receptor into which it is discharging. Air Gap (water distribution system): The unobstructed vertical distance through the free atmosphere between the lowest opening from any pipe or faucet supplying water to a tank, plumbing fixture or other device and the flood level rim of the receptor. Anchors: See “Supports” Anti-scald Valve: See “Water Temperature Control Valve” Approved: Accepted or acceptable under an applicable standard stated or cited in this Code, or accepted as suitable for the proposed use under procedures and powers of the Authority Having Jurisdiction as defined in Section 3.12. 2006 National Standard Plumbing Code 13
  • 24. Area Drain: A receptor designed to collect surface or storm water from an open area. Aspirator: A fitting or device supplied with water or other fluid under positive pressure that passes through an integral orifice or “constriction” causing a vacuum. Authority Having Jurisdiction (See also “Adopting Agency”) The individual official, board, department or agency established and authorized by a state, county, city or other political subdivision created by law to administer and enforce the provisions of the plumbing code as adopted or amended. Automatic Flushing Device: A device that automatically flushes a fixture after each use without the need for manual activation. Auxiliary Floor Drain: A floor drain that does not receive the discharge from any indirect waste pipe. Auxiliary floor drains have no DFU loading. Backflow Connection: Any arrangement whereby backflow can occur. Backflow (drainage): A reversal of flow in the drainage system. Backflow Preventer: A device or means to prevent backflow. Backflow (Water Distribution): The flow of water or other liquids, mixtures or substances from any source or sources into the distribution pipes of a potable water system. Back-siphonage is one type of backflow. Backpressure Backflow: Backflow caused by a higher pressure in the non-potable system than in the potable supply system. Back-siphonage: Backflow caused by a greater negative pressure in the potable system than in the non-potable supply system. Backwater Valve: A device installed in a drain pipe to prevent backflow. Baptistery: A tank or pool for baptizing by total immersion. Bathroom Group: A group of fixtures in a dwelling unit bathroom consisting of one water closet, one or two lavatories, and either one bathtub, one combination bath/shower or one shower stall. Other fixtures within the bathing facility shall be counted separately when determining the water supply and drainage fixture unit loads. Battery of Fixtures: Any group of two or more similar adjacent fixtures that discharge into a common horizontal waste or soil branch. Bedpan Steamer: A fixture used for scalding bedpans or urinals by direct application of steam. Boiler Blow-off: An outlet on a boiler to permit emptying or discharge of sediment. Boiler Blow-off Tank: A vessel designed to receive the discharge from a boiler blow-off outlet and to cool the discharge to a temperature that permits its safe discharge to the drainage system. Branch: Any part of the piping system other than a riser, main or stack. 14 2006 National Standard Plumbing Code
  • 25. Branch, Fixture: See “Fixture Branch” Branch, Horizontal: See “Horizontal Branch Drain” Branch Interval: A distance along a soil or waste stack corresponding, in general, to a story height, but in no case less than 8 feet within which the horizontal branches from one floor or story of a building are connected to the stack. Branch Vent: See “Vent, Branch” Building: A structure having walls and a roof designed and used for the housing, shelter, enclosure, or support of persons, animals, or property. Building Classification: The arrangement adopted by the Authority Having Jurisdiction for the designation of buildings in classes according to occupancy. Building Drain: The lowest piping in a drainage system that receives the discharge from stacks and horizontal fixture branches within a building that convey sewage, waste, or other drainage to a building sewer beginning three (3) feet outside the building wall. Horizontal fixture branches are sized according to Table 11.5.1B until they connect to the building drain or a branch of the building drain that serves two or more horizontal fixture branches. Building Drain, Combined: A building drain that conveys both sewage and storm water or other drainage. Building Drain, Sanitary: A building drain that conveys sewage only. Building Drain, Storm: A building drain that conveys storm water or other drainage, but no sewage. Building Sewer: That part of the drainage system that extends from the end of the building drain and conveys its discharge to a public sewer, private sewer, individual sewage disposal system or other point of disposal. The building sewer begins at a point three feet beyond the outside face of the building. Building Sewer, Combined: A building sewer that conveys both sewage and storm water or other drainage. Building Sewer, Sanitary: A building sewer that conveys sewage only. Building Sewer, Storm: A building sewer that conveys storm water or other drainage but no sewage. Building Subdrain: That portion of a drainage system that does not drain by gravity into the building sewer or building drain. Building Trap: A device, fitting, or assembly of fittings, installed in the building drain to prevent circulation of air between the drainage system of the building and the building sewer. Cesspool: A lined and covered excavation in the ground that receives the discharge of domestic sewage or other organic wastes from a drainage system, so designed as to retain the organic matter and solids, but permitting the liquids to seep through the bottom and sides. Chemical Waste: See “Special Wastes” Circuit Vent: See “Vent, Circuit” 2006 National Standard Plumbing Code 15
  • 26. Clear Water Waste: Effluent in which impurity levels are less than concentrations considered harmful by the Authority Having Jurisdiction, such as cooling water and condensate drainage from refrigeration and air conditioning equipment, cooled condensate from steam heating systems, and residual water from ice making processes. Clinical Sink: A sink designed primarily to receive wastes from bedpans, having a flushing rim, intergral trap with a visible trap seal, and having the same flushing and cleansing characteristics as a water closet. Code: These regulations, or any emergency rule or regulation that the Authority Having Jurisdiction may lawfully adopt. Combination Fixture: A fixture combining one sink and laundry tray, or a two- or three-compartment sink or laundry tray in one unit. Combination Thermostatic/Pressure Balancing Valve: See “Thermostatic/Pressure Balancing Valve, Combined” Combination Waste and Vent System: A designed system of waste piping embodying the horizontal wet venting of one or more sinks or floor drains by means of a common waste and vent pipe adequately sized to provide free movement of air above the flow line of the drain. Combined Building Drain: See “Building Drain , Combined” Combined Building Sewer: See “Building Sewer , Combined” Common Vent: See “Vent, Common” Conductor: A pipe within a building that conveys stormwater from a roof to its connection to a building storm drain or other point of disposal. Contamination: The impairment of the quality of the potable water that creates an actual hazard to the public health through poisoning or through the spread of disease by sewage, industrial fluids or waste. (See the definition of “pollution”). Continuous Vent: See “Vent, Continuous” Continuous Waste: A drain from two or more fixtures connected to a single trap. Critical Level: The marking on a backflow prevention device or vacuum breaker established by the manufacturer, and usually stamped on the device by the manufacturer, that determines the minimum elevation above the flood level rim of the fixture or receptor served at which the device must be installed. When a backflow prevention device does not bear a critical level marking, the bottom of the vacuum breaker, combination valve, or the bottom of any approved device constitutes the critical level. Cross Connection: Any connection or arrangement between two otherwise separate piping systems, one of that contains potable water and the other either water of questionable safety, steam, gas, or chemical, whereby there may be a flow from one system to the other, the direction of flow depending on the pressure differential between the two systems (See “Backflow and Back-Siphonage). Day Care Center: A facility for the care and/or education of children ranging from 2-1/2 years of age to 5 years of age. 16 2006 National Standard Plumbing Code
  • 27. Day Nursery: A facility for the care of children less than 2-1/2 years of age. Dead End, Potable Water: A branch line terminating at a developed length of two (2) feet or more from an active potable water line by means of a plug or cap. Dead End, Soil, Waste, or Vent: A branch leading from a soil, waste or vent pipe, building drain, or building sewer line and terminating at a developed length of two (2) feet or more by means of a plug, cap, or other closed fitting. Developed Length: The length of a pipe line measured along the center line of the pipe and fittings. Diameter: See “Size of Pipe & Tubing” Domestic Sewage: The water-borne wastes derived from ordinary living processes. Double Check Valve Assembly: A backflow prevention device consisting of two independently acting check valves, internally force loaded to a normally closed position between two tightly closing shut-off valves, and with means of testing for tightness. Double Offset: See “Offset, Double” Downspout: See “Leader” Drain: Any pipe that carries waste or water-borne wastes in a building drainage system. Drainage Pipe: See “Drainage System” Drainage, Sump : A liquid and air-tight tank that receives sewage and/or liquid waste, located below the elevation of a gravity drainage system, that is emptied by pumping. Drainage System: All the piping within public or private premises that conveys sewage, rain water, or other liquid wastes to a point of disposal. It does not include the mains of a public sewer system or private or public sewage-treatment facilities. Drainage System, Building Gravity: A drainage system that drains by gravity into the building sewer. Drainage System, Sub-building: See “Building Subdrain” Dry Vent: See “Vent, Dry” Dry Well: See “Leaching Well” Dual Vent: See “Vent, Common” Dwelling Unit, Multiple: A room, or group of rooms, forming a single habitable unit with facilities that are used, or intended to be used, for living, sleeping, cooking and eating; and whose sewer connections and water supply, within its own premise, are shared with one or more other dwelling units. Multiple dwelling units include guest rooms in hotels and motels. 2006 National Standard Plumbing Code 17
  • 28. Dwelling Unit, Single: A room, or group of rooms, forming a single habitable unit with facilities that are used, or intended to be used, for living, sleeping, cooking and eating; and whose sewer connections and water supply are, within its own premise, separate from and completely independent of any other dwelling. DWV: An acronym for “drain-waste-vent” referring to the combined sanitary drainage and venting systems. This term is equivalent to “soil-waste-vent” (SWV). Effective Opening: The minimum cross-sectional area at the point of water supply discharge, measured or expressed in terms of (1) diameter of a circle, or (2) if the opening is not circular, the diameter of a circle of equivalent cross-sectional area. Equivalent Length: The length of straight pipe of a specific diameter that would produce the same frictional resistances as a particular fitting or line comprised of pipe and fittings. Existing Plumbing System: An existing plumbing system, or any part thereof, installed prior to the effective date of this Code. Existing Work: A plumbing system, or any part thereof, installed prior to the effective date of this Code. Family: One or more individuals living together and sharing the same facilities. Fixture: See “Plumbing Fixture” Fixture Branch, Supply: A branch of the water distribution system supplying one fixture. Fixture Branch, Drainage: A drain serving one or more fixtures that discharges into another drain. Fixture Drain: The drain from the trap of a fixture to the junction of that drain with any other drain pipe. Fixture Unit (Drainage -DFU): An index number that represents the load of a fixture on the drainage system so that the load of various fixtures in various applications can be combined. The value is based on the volume or volume rate of drainage discharge from the fixture, the time duration of that discharge, and the average time between successive uses of the fixture. One DFU was originally equated to a drainage flow rate of one cubic foot per minute or 7.5 gallons per minute through the fixture outlet. Fixture Unit (Water Supply - WSFU): An index number that represents the load of a fixture on the water supply system so that the load of various fixtures in various applications can be combined. The value is based on the volume rate of supply for the fixture, the time duration of a single supply operation, and the average time between successive uses of the fixture. Water supply fixture units were originally based on a comparison to a flushometer valve water closet, which was arbitrarily assigned a value of 10 WSFU. Flexible Water Connector: A connector under continuous pressure in an accessible location that connects a supply fitting, faucet, dishwasher, cloths washer, water heater, water treatment unit, or other fixture or equipment to a stop valve or its water supply branch pipe. Flood Level: See “Flood Level Rim” Flood Level Rim: The edge of the receptor or fixture over which water flows if the fixture is flooded. 18 2006 National Standard Plumbing Code
  • 29. Flooded: The condition that results when the liquid in a receptor or fixture rises to the flood level rim. Flow Pressure: The pressure in the water supply pipe near the faucet or water outlet while the faucet or water outlet is fully open and flowing. Flush Pipes and Fittings: The pipe and fittings that connect a flushometer valve or elevated flush tank to a water closet, urinal, or bed pan washer. Flushing Type Floor Drain: A floor drain that is equipped with an integral water supply connection, enabling flushing of the drain receptor and trap. Flush Valve: A device located at the bottom of a tank for flushing water closets and similar fixtures. Flushometer Tank: A water closet flush tank that uses an air accumulator vessel to discharge a predetermined quantity of water into the closet bowl for flushing purposes. Flushometer Valve: A device that discharges a predetermined quantity of water to fixtures for flushing and is closed by direct water pressure or other means. Force Main: A main that delivers waste water under pressure from a sewage ejector or pump to its destination. Full-way valve: Full-way valves include gate valves, full port ball valves, and other valves that are identified by their manufacturer as full port or full bore. Grade: The fall (slope) of a line of pipe in reference to a horizontal plane. Grease Interceptor: A plumbing appurtenance that is installed in the sanitary drainage system to intercept oily and greasy wastes from wastewater discharges, typically in commercial kitchens and food processing plants. Such equipment has the ability to intercept commonly occurring free-floating fats and oils. Grease Recovery Device (GRD): A plumbing appurtenance that is installed in the sanitary drainage system to intercept and remove free-floating fats, oils, and grease from wastewater discharges, typically in commercial kitchens and food processing plants. Such equipment operates on a time or event- controlled basis and has the ability to remove the entire range of commonly occurring free-floating fats, oils, and grease automatically without intervention from the user except for maintenance. The removed material is essentially water-free, which allows for recycling of the removed product. Grease Trap: See “Interceptor” Grinder Pump: A pump for sewage that shreds or grinds the solids in the sewage that it pumps. Ground Water: Subsurface water occupying the zone of saturation. (a) confined ground water - a body of ground water overlaid by material sufficiently impervious to sever free hydraulic connection with overlying ground water. (b) free ground water - ground water in the zone of saturation extending down to the first impervious barrier. Half-Bath: A room that contains one water closet and one lavatory within a dwelling unit. Hangers: See “Supports” 2006 National Standard Plumbing Code 19
  • 30. Health Hazard In backflow prevention, an actual or potential threat of contamination of the potable water supply to the plumbing system of a physical or toxic nature that would be a danger to health. Health hazards include any contamination that could cause death, illness, or spread of disease. Horizontal Branch Drain: A drain pipe extending laterally from a soil stack, waste stack or building drain with or without vertical sections or branches, that receives the waste discharged from one or more fixture drains and conducts the waste to a soil stack, waste stack, or building drain. Horizontal Pipe: Any pipe or fitting that makes an angle of less than 450 with the horizontal. Hot Water: Potable water that is heated to a required temperature for its intended use. House Drain: See “Building Drain” House Sewer: See “Building Sewer” House Trap: See “Building Trap” Indirect Connection (Waste): The introduction of waste into the drainage system by means of an air gap or air break. Indirect Waste Pipe: A waste pipe that does not connect directly with the drainage system, but which discharges into the drainage system through an air break or air gap into a trap, fixture, receptor or interceptor. Individual Vent: See “Vent, Individual” Industrial Wastes: Liquid or liquid-borne wastes resulting from the processes employed in industrial and commercial establishments. Insanitary: Contrary to sanitary principles -- injurious to health. Installed: Altered, changed or a new installation . Interceptor: A device designed and installed so as to separate and retain deleterious, hazardous, or undesirable matter from normal wastes while permitting normal sewage or liquid wastes to discharge into the drainage system by gravity. Invert: The lowest portion of the inside of a horizontal pipe. Leaching Well or Pit: A pit or receptor having porous walls that permit the liquid contents to seep into the ground. Leader: An exterior vertical drainage pipe for conveying storm water from roof or gutter drains. Load Factor: The percentage of the total connected fixture unit flow that is likely to occur at any point in the drainage system. Local Ventilating Pipe: A pipe on the fixture side of the trap through which vapor or foul air is removed from a fixture. 20 2006 National Standard Plumbing Code
  • 31. Loop Vent: See “Vent, Loop” Low Hazard: See “Hazard, Low” Macerating Toilet System: A system that collects drainage from a single water closet, lavatory and/or bathtub located in the same room. It consists of a receiving container, a grinder pump, and associated level controls. The system pumps shredded or macerated sewage up to a point of discharge Main: The principal pipe artery to which branches may be connected. Main Sewer: See “Public Sewer” May: The word “may” is a permissive term. Medical Gas System: The complete system used to convey medical gases for direct application from central supply systems (bulk tanks, manifolds and medical air compressors) through piping networks with pressure and operating controls, alarm warning systems, etc., and extending to station outlet valves at use points. Medical Vacuum Systems: A system consisting of central-vacuum-producing equipment with pressure and operating controls, shut-off valves, alarm warning systems, gauges and a network of piping extending to and terminating with suitable station inlets to locations where suction may be required. Multiple Dwelling: A building containing two or more dwelling units. Non-Health Hazard: In backflow prevention, an actual or potential threat to the physical properties or potability of the water supply to the plumbing system, but which would not constitute a health or system hazard. Non-potable Water: Water not safe for drinking, personal or culinary use. Nominal Size: A standard expression in inches and fractions thereof to denote equal. Existing in name only and not in actuality. Nuisance: Public nuisance at common law or in equity jurisprudence; whatever is dangerous to human life or detrimental to health; whatever building, structure, or premises is not sufficiently ventilated, sewered, drained, cleaned, or lighted in reference to its intended or actual use; and whatever renders the air, human food, drink or water supply unwholesome. Offset: A combination of elbows or bends that brings one section of the pipe out of line but into a line parallel with the other section. Offset, Double: Two offsets installed in succession or series in a continuous pipe. Offset, Return: A double offset installed so as to return the pipe to its original alignment. Oil Interceptor: See “Interceptor” Person: A natural person, his heirs, executors, administrators or assigns; including a firm, partnership or corporation, its or their successors or assigns. Singular includes plural; male includes female. 2006 National Standard Plumbing Code 21
  • 32. Pitch: See “Grade” Plenum: An enclosed portion of the building structure, other than an occupiable space being conditioned, that is designed to allow air movement, and thereby serve as part of an air distribution system. Plumbing The practice, materials, and fixtures within or adjacent to any building structure or conveyance, used in the installation, maintenance, extension, alteration and removal of any piping, plumbing fixtures, plumbing appliances, and plumbing appurtenances in connection with any of the following: a.. b. c. d. e. f. g. Sanitary drainage system and its related vent system, Storm water drainage facilities, Public or private potable water supply systems, The initial connection to a potable water supply upstream of any required backflow prevention devices and the final connection that discharges indirectly into a public or private disposal system, Medical gas and medical vacuum systems, Indirect waste piping including refrigeration and air conditioning drainage, Liquid waste or sewage, and water supply, of any premises to their connection with an approved water supply system or to an acceptable disposal facility. NOTE: The following are excluded from the definition: 1. 2. 3. 4. 5. All piping, equipment or material used exclusively for environmental control. Piping used for the incorporation of liquids or gases into any product or process for use in the manufacturing or storage of any product, including product development. Piping used for the installation, alteration, repair or removal of automatic sprinkler systems installed for fire protection only. The related appurtenances or standpipes connected to automatic sprinkler systems or overhead or underground fire lines beginning at a point where water is used exclusively for fire protection. Piping used for lawn sprinkler systems downstream from backflow prevention devices. Plumbing Appliance: Any one of a special class of plumbing fixture that is intended to perform a special plumbing function. Its operation and/or control may be dependent upon one or more energized components, such as motors, controls, heating elements, or pressure or temperature-sensing elements. Such fixtures may operate automatically through one or more of the following actions: a time cycle, a temperature range, a pressure range, a measured volume or weight; or the fixture may be manually adjusted or controlled by the user or operator. Plumbing Appurtenance: A manufactured device, a prefabricated assembly, or an on-the-job assembly of component parts, that is an adjunct to the basic piping system and plumbing fixtures. An appurtenance demands no additional water supply, nor does it add any discharge load to a fixture or to the drainage system. It is presumed that an appurtenance performs some useful function in the operation, maintenance, servicing, economy, or safety of the plumbing system. Plumbing Fixture: A receptacle or device connected to the water distribution system of the premises, and demands a supply of water there from; or discharges used water, liquid-borne waste materials, or sewage either directly or indirectly to the drainage system of the premises; or which requires both a water supply connection and a discharge to the drainage system of the premises. Plumbing appliances as a special class of fixture are further defined. 22 2006 National Standard Plumbing Code
  • 33. Plumbing Inspector: See “Authority Having Jurisdiction” Plumbing System: Includes the water supply and distribution pipes, plumbing fixtures and traps; soil, waste and vent pipes; sanitary and storm drains and building sewers; including their respective connections, devices and appurtenances to an approved point of disposal. Pollution "Potable Water": An impairment of the quality of the potable water to a degree that does not create a hazard to the public health but that does adversely and unreasonably affect the aesthetic qualities of such potable water for domestic use. (See the definition of “contamination”). Pool: See “Swimming Pool” Potable Water: Water free from impurities present in amounts sufficient to cause disease or harmful physiological effects and conforming in its bacteriological and chemical quality to the requirements of the Public Health Service Drinking Water Standards or the regulations of the public health authority having jurisdiction. Powder Room: See “Half-Bath.” Pressure Assisted Water Closet: See Water Closet, Pressure Assisted. Pressure Balancing Valve: A mixing valve that senses incoming hot and cold water pressures and compensates for fluctuations in either to stabilize its outlet temperature. Private Sewage Disposal System: A system for disposal of domestic sewage by means of a septic tank or mechanical treatment, designed for use apart from a public sewer to serve a single establishment or building. Private Sewer: Any sewer not directly controlled by public authority. Private Use, Public Use: Private Use - Plumbing facilities for the private and restricted use of one or more individuals in dwelling units (including hotel and motel guest rooms), and other plumbing facilities that are not intended for public use. Refer to the definition of “Public Use”. Public Use - Plumbing facilities intended for the unrestricted use of more than one individual (including employees) in assembly occupancies, business occupancies, public buildings, transportation facilities, schools and other educational facilities, office buildings, restaurants, bars, other food service facilities, mercantile facilities, manufacturing facilities, military facilities, and other plumbing installations that are not intended for private use. Refer to the definition of “Private Use”. Private Water Supply: A supply, other than an approved public water supply, that serves one or more buildings. Public Sewer: A common sewer directly controlled by public authority. Public Toilet Room: A toilet room intended to serve the transient public, such as in, but not limited to the following examples: service stations, train stations, airports, restaurants, and convention halls. Public Water Main: A water supply pipe for public use controlled by public authority. 2006 National Standard Plumbing Code 23
  • 34. Pump Assisted Water Closet: See Water Closet, Pump Assisted. Receptor: A fixture or device that receives the discharge from indirect waste pipes. Reduced Pressure Backflow Preventer Assembly: See Reduced Pressure Zone Backflow Preventer Assembly Reduced Pressure Principle Assembly: A reduced pressure zone backflow preventer assembly. Reduced Pressure Zone Backflow Preventer Assembly: A backflow prevention device consisting of two independently acting check valves, internally force loaded to a normally closed position and separated by an intermediate chamber (or zone), in which there is an automatic relief means of venting to atmosphere internally loaded to a normally open position, and with means for testing for tightness of the checks and opening of the relief means. Relief Vent: See “Vent, Relief” Return Offset: See “Offset, Return” Revent Pipe: See “Vent, Individual” Rim: An unobstructed open edge of a fixture. Riser: A water supply pipe that extends vertically one full story or more to convey water to branches or to a group of fixtures. Roof Drain: A drain installed to receive water collecting on the surface of a roof and to discharge it into a leader or a conductor. Roughing-in: The installation of all parts of the plumbing system that can be completed prior to the installation of fixtures. This includes drainage, water supply, and vent piping, and the necessary fixture supports, or any fixtures that are built into the structure. Safe Waste: See “Indirect Waste Pipe” Sand Filter: A treatment device or structure, constructed above or below the surface of the ground, for removing solid or colloidal material of a type that cannot be removed by sedimentation, from septic tank effluent. Sand Interceptor: See “Interceptor” Sand Trap: See “Interceptor” Sanitary Sewer: A sewer that carries sewage and excludes storm, surface and ground water. SDR: An abbreviation for “standard dimensional ratio” that relates to a specific ratio of the average specified outside diameter to the minimum wall thickness for outside controlled diameter plastic pipe. Seepage Well or Pit: See “Leaching Well” 24 2006 National Standard Plumbing Code
  • 35. Service Sink: A sink or receptor intended for custodial use that is capable of being used to fill and empty a janitor's bucket. Included are mop basins, laundry sinks, utility sinks, and similar fixtures. (See Table 7.21.1) Septic Tank: A watertight receptacle that receives the discharge of a building sanitary drainage system or part thereof; and that is designed and constructed so as to separate solids from the liquid, digest organic matter through a period of detention, and allow the liquids to discharge into the soil outside of the tank through a system of open joint or perforated piping, or a seepage pit. Sewage: Liquid containing human waste (including fecal matter) and/or animal, vegetable, or chemical waste matter in suspension or solution. Sewage Ejector, Pneumatic Type: A unit that uses compressed air to discharge and lift sewage to a gravity sewage system. Sewage Pump or Pump-Type Ejector: A non-clog or grinder-type sewage pump or ejector. Sewage pumps and pump-type ejectors are either the submersible or vertical type. Shall: “Shall” is a mandatory term. Shock Arrestor (mechanical device): A device used to absorb the pressure surge (water hammer) that occurs when water flow is suddenly stopped. Short Term: A period of time not more than 30 minutes. Side Vent: See “Vent, Side” Sink, Commercial: A sink other than for a domestic application. Commercial sinks include, but are not limited to: 1. 2. 3. 4. pot sinks scullery sinks sinks used in photographic or other processes laboratory sinks Size of Pipe and Tubing: The nominal inside diameter in inches as indicated in the material standards in Table 3.1.3. If outside diameter is used, the size will be followed by “o.d.”. Size of Pipe and Tubing, Incremental: Where relative size requirements are mentioned, the following schedule of sizes is recognized, even if all sizes may not be available commercially: 1/4, 3/8, 1/2, 3/4, 1, 1-1/4, 1-1/2, 2, 2-1/2, 3, 3-1/2, 4, 4-1/2, 5, 6, 7, 8, 10, 12, 15, 18, 21, 24. Slip Joint: A connection in drainage piping consisting of a compression nut and compression washer that permits drainage tubing to be inserted into the joint and secured by tightening the compression nut. Slip joints are typically used in trap connections for lavatories, sinks, and bathtubs. They permit the trap to be removed for cleaning or replacement, and to provide access to the drainage piping. Slope: See “Grade” Soil Pipe or Soil Stack: Pipes that convey sewage containing fecal matter to the building drain or building sewer. Special Wastes: Wastes that require special treatment before entry into the normal plumbing system. 2006 National Standard Plumbing Code 25
  • 36. Special Waste Pipe: Pipes that convey special wastes. Stack: A general term for any vertical line including offsets of soil, waste, vent or inside conductor piping. This does not include vertical fixture and vent branches that do not extend through the roof or that pass through not more than two stories before being reconnected to the vent stack or stack vent. Stack Group: A group of fixtures located adjacent to the stack so that by means of proper fittings, vents may be reduced to a minimum. Stack Vent: The extension of a soil or waste stack above the highest horizontal drain connected to the stack. Stack Venting: A method of venting a fixture or fixtures through the soil or waste stack. Standpipe (indirect waste receptor): A vertical drain pipe that has an open top inlet that provides an air break or air gap for indirect waste discharge. Storm Drain: See “Drain, Storm” Storm Sewer: A sewer used for conveying rainwater, surface water, condensate, cooling water, or similar liquid wastes. Subsoil Drain: A drain that collects subsurface or seepage water and conveys it to a place of disposal. Suction Line: The inlet pipe to a pump on which a negative pressure may exist under design conditions. Sump: A tank or pit that receives only liquid wastes, located below the elevation of a gravity discharge, that is emptied by pumping. Sump, Drainage (sewage): A liquid and air-tight tank that receives sewage and/or liquid waste, located below the elevation of a gravity drainage system, that is emptied by pumping. Sump Pump: A permanently installed mechanical device for removing clear water or liquid waste from a sump. Supports: Devices for supporting and securing pipe, fixtures and equipment. Swimming Pool: Any structure, basin, chamber or tank containing a body of water for swimming, diving, or recreational bathing. Tempered Water: A mixture of hot and cold water to reach a desired temperature for its intended use. Thermostatic/Pressure Balancing Valve, Combination: A mixing valve that senses outlet temperature and incoming hot and cold water pressure and compenstates for fluctuations in incoming hot and cold water temperatures and/or pressures to stabilize its outlet temperatures. Thermostatic (Temperature Control) Valve: A mixing valve that senses outlet temperature and compensates for fluctuations in incoming hot or cold water temperatures. Toilet Facility: A room or combination of interconnected spaces in other than a dwelling that contains one or more water closets and associated lavatories, with signage to identify its intended use. 26 2006 National Standard Plumbing Code
  • 37. Trap: A fitting or device that provides a liquid seal to prevent the emission of sewer gasses without materially affecting the flow of sewage or waste water through it. Trap Arm: That portion of a fixture drain between a trap and its vent. Trap Primer: A device or system of piping to maintain a water seal in a trap. Trap Seal: The maximum vertical depth of liquid that a trap will retain, measured between the crown weir and the top of the dip of the trap. Vacuum: Any pressure less than that exerted by the atmosphere. Vacuum Assisted Water Closet: See Water Closet, Vacuum Assisted. Vacuum Breaker: See “Backflow Preventer” Vacuum Breaker, Atmospheric Type: A vacuum breaker that is not designed to be subject to static line pressure. Vacuum Breaker, Pressure Type: A vacuum breaker designed to operate under conditions of static line pressure. Vacuum Breaker, Spill-resistant (SVB): A pressure-type vacuum breaker specifically designed to avoid spillage during operation, consisting of one check valve force-loaded closed and an air inlet vent valve force-loaded open to atmosphere, positioned downstream of the check valve, and located between and including two tightly closing shut-off valves and a means for testing. Vacuum Relief Valve: A device to admit atmospheric air into a vessel if a vacuum is developed in that vessel. Vent, Branch: A vent connecting one or more individual vents with a vent stack or stack vent. Vent, Circuit: A vent that connects to a horizontal drainage branch and vents from two to eight traps or trapped fixtures connected in a battery. Vent, Common: A vent connected at the common connection of two fixture drains and serving as a vent for both fixtures. Vent, Continuous: A vertical vent that is a continuation of the drain to which it connects. Vent, Dry: A vent that does not receive the discharge of any sewage or waste. Vent, Individual: A pipe installed to vent a single fixture drain. Vent, Loop: A circuit vent that loops back to connect with a stack vent instead of a vent stack. Vent, Relief: An auxiliary vent that permits additional circulation of air in or between a drainage and vent system. 2006 National Standard Plumbing Code 27
  • 38. Vent, Side: A vent connecting to a drain pipe through a fitting at an angle not greater than 45° to the vertical. Vent, Sterilizer: A separate pipe or stack, indirectly connected to the building drainage system at the lower terminal, that receives the vapors from non-pressure sterilizers, or the exhaust vapors from pressure sterilizers, and conducts the vapors directly to the outer air. Sometimes called vapor, steam, atmosphere or exhaust vent. Vent, Wet: A vent that receives the discharge of wastes from fixtures other than water closets or kitchen sinks. Vent, Yoke: A pipe connecting upward from a soil or waste stack to a vent stack for the purpose of equalizing the pressures in the stacks. Vent Pipe: Part of the vent system. Vent Stack: A vertical vent pipe that extends through one or more stories and that is intended to provide circulation of air to and from the drainage system. Vent System: A pipe, or pipes, installed to provide a flow of air to or from a drainage system or to provide a circulation of air within such system to protect trap seals from siphonage and back pressure. Vertical Pipe: Any pipe or fitting that makes an angle of 45o or more with the horizontal. Wall Hung Water Closet: A water closet installed in such a way that no part of it touches the floor. Waste: Any remaining liquid, or liquid-borne material or residue intended to be discharged to the drainage system after any activity or process, but not including any such materials that contain animal or human fecal matter. Waste Pipe: A pipe that conveys only waste. Waste Stack, Pipe or Piping: Pipes that convey the discharge from fixtures (other than water closets), appliances, areas, or appurtenances, that do not contain fecal matter. Water Closet, Pressure Assisted: A low consumption water closet with an air accumulator vessel in the tank that stores water and air under pressure, using the water supply pressure. When flushed, the air produces a high velocity jet of water and air that forces the contents out of the bowl. Water Closet, Pump Assisted: A low consumption water closet with a fractional horsepower pump in the tank that produces a high velocity jet in the trap way that assists the flushing action. Water Closet, Vacuum Assisted: A low consumption water closet that uses the falling water level in the tank to induce a vacuum near the outlet of the trap way that assists the flushing action. Water Distribution Piping: Piping within the building or on the premises that conveys water from the waterservice pipe to the point of use. Water Lift: See “Sewage Ejector” Water Main: A water supply pipe available for public connection. 28 2006 National Standard Plumbing Code
  • 39. Water Outlet: A discharge opening through which water is supplied to a fixture, into the atmosphere (except into an open tank that is part of the water supply system), to a boiler or heating system, to any devices or equipment requiring water to operate but that are not part of the plumbing system. Water Riser Pipe: See “Riser” Water Service Pipe: The pipe from the water main, or other source of potable water supply, to the water distribution system of the building served. Water Supply System: The water service pipe, the water distribution pipes, and the necessary connecting pipes, fittings, control valves, and appurtenances in or adjacent to the building or premises. Water Temperature Control Valve: A valve of the pressure balance, thermostatic mixing, or combination pressure balance/thermostatic mixing type that is designed to control water temperature to reduce the risk of scalding. Wet Vent: See “Vent, Wet” Whirlpool Bathtub: A plumbing appliance consisting of a bathtub fixture that is equipped and fitted with a circulation piping system, pump, and other appurtenances and is so designed to accept, circulate, and discharge bathtub water upon each use. Weir (trap or crown): The overflow level of a trap outlet. Yoke Vent: See “Vent, Yoke” 2006 National Standard Plumbing Code 29
  • 40. Blank Page 30 2006 National Standard Plumbing Code
  • 41. Chapter 2 General Regulations 2.1 RESERVED 2.2 RESERVED 2.3 CHANGES IN DIRECTION OF DRAINAGE PIPING 2.3.1 Uses for Drainage Fittings a. Changes in direction of drainage piping shall be made with long radius drainage fittings. See Table 2.3.1. EXCEPTION: Short radius drainage fittings shall be permitted in the drain piping for individual fixtures. See Table 2.3.1. b. Short radius drainage fittings are those having radius or centerline dimensions that are approximately equal to or less than their nominal pipe size. The radius or centerline dimensions of long radius drainage fittings are greater than their nominal pipe size. c. Long radius drainage fittings shall not be used to connect fixture trap arms to vertical drain and vent piping. Connections to fixture vents shall be above the top weir of the fixture trap. 2.3.2 Double Pattern Fittings The uses for double pattern drainage fittings shall be the same as for single pattern fittings in Table 2.3.1. EXCEPTION: Double sanitary tees and crosses shall not be used to connect blowout fixtures, back-outlet water closets, and fixtures or appliances having pumped discharge. 2.3.3 Back-to-Back Fixtures Stack fittings, including carriers, for back-outlet fixtures installed back-to-back shall be either the wye pattern, incorporate baffles within the drainage fitting, or otherwise be designed to prevent crossflow or mixing of the discharges from the two fixtures prior to the change in direction. 2.4 FITTINGS AND CONNECTIONS IN DRAINAGE SYSTEMS 2.4.1 Prohibited Fittings No running threads or saddles shall be used in the drainage or vent system. No drainage or vent piping shall be drilled, tapped, burned or welded. 2006 National Standard Plumbing Code 31
  • 42. PIPE MATERIAL CAST IRON HUB & SPIGOT CAST IRON NO-HUB CAST IRON DRAINAGE (threaded) COPPER DWV PLASTIC DWV STAINLESS STEEL push-fit DWV Table 2.3.1 PERMISSIBLE DRAINAGE FITTINGS FOR CHANGES IN DIRECTION CHANGE IN DIRECTION HORIZONTAL HORIZONTAL VERTICAL TO TO TO HORIZONTAL VERTICAL HORIZONTAL long sweep sanitary tee (1) eighth bend and wye short sweep eighth bend and wye (2) combination wye & eighth bend wye combination wye & eighth bend (2) long sweep combination wye & eighth bend long sweep short sweep 3" or larger fifth bend (72-deg) short sweep quarter bend (1) sixth bend (60-deg) quarter bend (1) short sweep (1) eighth bend (45-deg) sixteenth bend (22 ½ deg) quarter bend (1) extra long turn 90-deg elbow drainage tee (1) long turn 90-deg TY long turn 90-deg elbow short turn 90-deg TY (1) extra long turn 90-deg elbow long turn 45-deg elbow long turn 90-deg TY (2) long turn 90-deg elbow short turn 22 ½ deg elbow 45-deg elbow and 45-deg Y branch (2) short turn 90-deg elbow (1) short turn 11 ¼ deg elbow extra long turn 90-deg elbow 45-deg elbow & 45-deg Y branch (1) long turn 90-deg TY long turn 90-deg elbow short turn 45-deg Y branch short turn 90-deg elbow (1) short turn 90-deg elbow (1) short turn 60-deg elbow (1) short turn 45-deg elbow (1) DWV 90-deg long radius elbow DWV tee (1) DWV long turn T-Y 90-deg elbow - long radius DWV 90-deg sanitary tee (1) 45-deg elbow and DWV 45-deg Y DWV long turn T-Y DWV long turn T-Y (2) DWV 90-deg long radius elbow DWV 45-deg Y 45-deg elbow & DWV 45-deg Y (2) 90-deg elbow - long radius DWV 90-deg elbow (1) DWV 90-deg long radius elbow DWV 90-deg elbow (1) DWV 45-deg elbow (1) 90-deg elbow - long radius DWV 90-deg elbow (1) 90-deg long turn elbow sanitary tee (1) long radius TY long sweep 1/4 bend fixture tee (1) 45-deg elbow and 45-deg wye 60-deg elbow or 1/6 bend long radius TY (2) 90-deg long turn elbow 45-deg elbow or 1/8 bend 45-deg elbow and 45-deg wye (2) 90-deg elbow or 1/4 bend (1) 22 ½ deg elbow or 1/16 bend 90-deg long turn elbow long radius TY 90-deg elbow or 1/4 bend (1) 45-deg wye 90-deg elbow or 1/4 bend (1) long sweep tee (1) eighth bend & wye (2) wye sanitary tee (1) combination wye & eighth bend combination wye & eighth bend eighth bend & wye (2) long sweep 15-degree 1/24 bend combination wye & eighth bend 90-degree 1/4 bend (1) 22 ½ degree 1/16 bend long sweep 30-degree 1/12 bend 90-degree 1/4 bend (1) 45-degree 1/8 bend 90-degree 1/4 bend (1) Footnotes for Table 2.3.1 (1) Short radius fittings shall be permitted only in drain piping for individual fixtures. (2) Long radius fittings shall not be used to connect fixture trap arms to vertical drain and vent piping. 2.4.2 Heel or Side-Inlet Bends A heel or side-inlet quarter bend shall not be used as a dry vent when the inlet is placed in a horizontal position or any similar arrangement of pipe or fittings producing a similar effect. EXCEPTION: When the entire fitting is part of a dry vent arrangement system the heel or side-inlet bend shall be acceptable. 32 2006 National Standard Plumbing Code
  • 43. 2.4.3 Obstruction to Flow a. No fitting, connection, device, or method of installation that obstructs or retards the flow of water, wastes, sewage, or air in the drainage or venting systems in an amount greater than the normal frictional resistance to flow, shall be used unless it is indicated as acceptable in this Code. b. 4x3 closet bends and 4x3 closet flanges shall not be considered as obstructions to flow. 2.4.4 Prohibited Joints Cement mortar joints are prohibited. EXCEPTION: When used for repairs and/or when used for connections to existing lines constructed with such joints. 2.5 HEALTH AND SAFETY Where a health or safety hazard is found to exist on a premise, the owner or his agent shall be required to make such corrections as may be necessary to abate such nuisance, and bring the plumbing installation within the provisions of this Code. 2.6 TRENCHING, BEDDING, TUNNELING AND BACKFILLING 2.6.1 Trenching and Bedding a. Trenching and excavation for the installation of underground piping shall be performed in compliance with occupational safety and health requirements. Trenches shall be of sufficient width to permit proper installation of the pipe. Where shoring is required, additional allowance shall be made in the width of the trench to provide adequate clearance. b. A firm, stable, uniform bedding shall be provided under the pipe for continuous support. Bell holes shall be provided for joints in bell and spigot pipe and for other joints requiring such clearance. Blocking shall not be used to support the pipe. c. The trench bottom may provide the required bedding when adequate soil conditions exist and when excavated to the proper depth and grade. Where trenches are excavated to depths below the bottom of the pipe, bedding shall be added beneath the pipe as required. Such bedding shall be of clean sand, gravel, or similar select material that is compacted sufficiently to provide the support required under 2.6.1.b. d. Where rock is encountered in trenching, it shall be removed to a depth of not less than 6 inches below the bottom of the pipe and bedding shall be added as required under 2.6.1.c. The pipe shall not rest on rock at any point, including joints. 2.6.2 Side-fill The haunch areas adjacent to the pipe between the bottom of the pipe and its horizontal centerline shall be filled with a clean coarse-grain material such as sand, gravel, or soil. Such side-fill shall be placed by hand, extending to the sides of the trench, and be compacted to provide lateral support for the pipe. 2.6.3 Initial Backfill After installation of the side-fill, the trench shall be backfilled to a level not less than 2 feet above the top of the pipe. Backfill material shall be sand, gravel, or loose soil that is free of rocks and debris. Maximum particle size shall be 1-1/2 inches. Backfill shall be placed in not more than 6-inch layers, each tamped and compacted. Heavy compacting equipment shall not be used for the initial backfill. 2006 National Standard Plumbing Code 33
  • 44. 2.6.4 Final Backfill The trench shall be backfilled from the top of the compacted initial backfill to finish grade using suitable material. Heavy compacting equipment may be used for the final backfill. 2.6.5 Tunneling When pipe is installed in a dug or bored earth tunnel, the space around the pipe between the pipe and the wall of the tunnel shall be completely filled with packed concrete or grout. When pipe is installed in a jacked-inplace conduit or sleeve, the space around the pipe between the pipe and the inside of the conduit or sleeve shall be sealed in an approved manner in accordance with Section 2.12.d. 2.6.6 Underground Plastic Pipe a. Underground plastic pipe shall be installed in accordance with the requirements of Section 2.6. EXCEPTIONS: (1) The maximum particle size in the side-fill and initial backfill shall be not more than 1/2-inch for pipe 6" size and smaller, and 3/4-inch for pipe 8" and larger. (2) For water service piping, refer to ASTM D2774, Standard Practice for Underground Installation of Thermoplastic Pressure Piping. (3) For gravity-flow drainage pipe, refer to ASTM D2321, Underground Installation of Thermoplastic Pipe for Sewers and Other Gravity-flow Applications. b. An insulated copper tracer wire or other approved conductor shall be installed adjacent to underground non-metallic water service piping and non-metallic force mains, to facilitate finding. One end shall be brought above ground inside or outside the building wall. The tracer wire for the water service shall originate at the curb valve required in Section 10.12.1. The tracer wire for the force main shall originate at the final point of disposal. The tracer wire shall not be less than 18 AWG insulated. The insulation shall not be yellow in color. 2.6.7 Underground Copper Piping Underground copper piping shall be installed in accordance with the requirements of Section 2.6. EXCEPTION: The maximum particle size in the side-fill and initial backfill shall be not more than 1/2-inch for pipe 6" size and smaller, and 3/4-inch for pipe 8" and larger. 2.6.8 Safety Precautions Rules and regulations pertaining to safety and protection of workers, other persons in the vicinity, and neighboring property shall be adhered to where trenching or similar operations are being conducted. 2.6.9 Supervision Where excavation, bedding or backfilling are performed by persons other than the installer of the underground piping, the pipe installer shall supervise the bedding, side-fill, and initial backfill, and shall be responsible for its conformance to this Code. 2.6.10 Trenchless Pipe Replacement Systems Trenchless replacement of water and sewer piping shall be performed using equipment and procedures recommended by the equipment manufacturer. Where underground piping beneath paved surfaces or concrete floor slabs is replaced by this method, the manufacturer’s recommendations for the specific conditions shall be used. Approved mechanical couplings shall be used to make the connections between new and existing piping. 34 2006 National Standard Plumbing Code
  • 45. 2.7 SAFETY Any part of a building or premise that is changed, altered, or required to be replaced as a result of the installation, alteration, renovation, or replacement of a plumbing system, or any part thereof, shall be left in a safe, non-hazardous condition. 2.8 INSTALLATION PRACTICES Plumbing systems shall be installed in a manner conforming to this Code and industry installation standards. 2.9 PROTECTION OF PIPES 2.9.1 Breakage Pipes passing under or through foundation walls shall be protected from breakage. 2.9.2 Corrosion Pipe subject to corrosion by passing through or under corrosive fill, such as, but not limited to, cinders, concrete, or other corrosive material, shall be protected against external corrosion by protective coating, wrapping, or other means that will resist such corrosion. 2.9.3 Cutting or Notching Any structural member weakened or impaired by cutting, notching, or otherwise, shall be reinforced, repaired or replaced, so as to be left in a safe structural condition in accordance with the requirements of the Building Code or as required by the proper Authority Having Jurisdiction. 2.9.4 Penetration a. Plastic and copper piping run through framing members to within one inch of the edge of the framing shall be protected by steel nail plates not less than 18 gauge. Where such piping penetrates top plates or sole plates of the framing, the nail plate shall extend at least two inches below top plates and two inches above sole plates. b. Where plastic and copper piping runs through metal framing members, it shall be protected from abrasion caused by expansion and contraction of the piping or movement of the framing. 2.10 EXCLUSION OF MATERIALS DETRIMENTAL TO THE SEWAGE SYSTEM 2.10.1 General No material shall be deposited into a building drainage system or sewer that would or could either obstruct, damage, or overload such system; that could interfere with the normal operation of sewage treatment processes; or that could be hazardous to people or property. This provision shall not prohibit the installation of special waste systems when approved by the Authority Having Jurisdiction. 2.10.2 Industrial Wastes Waste products from manufacturing or industrial operations shall not be introduced into the public sewer system until it has been determined by the Authority Having Jurisdiction that the introduction thereof will not cause damage to the public sewer system or interfere with the functioning of the sewage treatment plant. 2006 National Standard Plumbing Code 35
  • 46. 2.11 PIPING MATERIALS EXPOSED WITHIN PLENUMS: All piping materials exposed within plenums shall comply with the provisions of other applicable Codes. 2.12 SLEEVES a. All piping passing through concrete walls, floors, slabs, and masonry walls shall be provided with sleeves for protection. EXCEPTION: Sleeves shall not be required for pipes passing through drilled or bored holes. Such holes shall provide 1/2 inch minimum clearance around the pipe and any thermal insulation. b. Sleeves shall be sized so there is a minimum of 1/2-inch clearance around the pipe and/or insulation. c. Piping through concrete or masonry walls shall not be subject to any load from building construction. d. The annular space between sleeves and pipes shall be filled or tightly caulked with coal tar, asphaltum compound, lead, or other material found equally effective and approved as such by the Authority Having Jurisdiction. e. All penetrations of construction required to have a fire resistance rating shall be protected in accordance with the applicable building regulations. 2.13 OPENINGS FOR PIPING a. Openings for plumbing piping shall be sealed as required to maintain the integrity of the wall, floor, ceiling, or roof that has been penetrated. b. Collars or escutcheon plates shall be provided to cover the openings around pipes where the piping penetrates walls, floors, or ceilings in finished areas that are exposed to view. 2.14 USED MATERIAL OR EQUIPMENT Used plumbing material or equipment that does not conform to the standards and regulations set forth in this Code shall not be installed in any plumbing system. 2.15 CONDEMNED EQUIPMENT Any plumbing equipment condemned by the Authority Having Jurisdiction because of wear, damage, defects or sanitary hazards, shall not be used for plumbing purposes. 2.16 FREEZING OR OVERHEATING a. The plumbing system shall be protected from freezing or overheating. The following conditions shall be met: 1. Water service piping shall be installed below recorded frost lines. Minimum earth cover shall be _____ inches. 2. Minimum earth cover for building sewers that connect to public sewage systems shall be inches. Minimum earth cover for building sewers that connect to individual sewage disposal systems shall be inches. 3. In systems that are used seasonally, water piping shall be installed to be drained. 4. Piping shall be installed so that the contents will not be heated due to close proximity to any heat source or from direct solar radiation. 5. In areas with seasonal freezing temperatures, all waste and water supply piping in exterior walls and other areas shall be protected from freezing. 2.17 PROTECTING FOOTINGS Trenching parallel to and below the bottom of footings or walls shall not penetrate a 45° plane extending outward from the bottom corner of the footing or wall, unless the soil type is approved by the Authority Having Jurisdiction for a different angle of repose. 36 2006 National Standard Plumbing Code

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