Revised National Plumbing Code of the Philippines PDF

 History of Plumbing Practice The birth of the plumbing profession in the Philippines is traced back to the 17th century. The WALI.ED CITY known as Intramuros was established by the Spaniards as a model conununity. The Friar Engineers who built the government buildings, residential...

 History of Plumbing Practice The birth of the plumbing profession in the Philippines is traced back to the 17th century. The WALI.ED CITY known as Intramuros was established by the Spaniards as a model conununity. The Friar Engineers who built the government buildings, residential and other structures. incorporated European standards in their plumbing installations. During the 18th and 1cJh centuries, the Filipino plumbers were assigned the task of maintaining, repairing and/or remodeling plumbing systems in all "pueblos" or towns including churches, convents and government buildings. The recognized plumbers then were called upon by the ''ilustrados" or the elite group to act as consultants of plumber journeymen on matters pertaining to plumbing installations in villas and mansions. PLUMBING took a great lr.-ap at the tum of the 20th century with theo arrival of the American soldiers, engineers, Thomasite teachers, doctors and evangelists. Health and hygiene became priority when epidemics including cholera, leprosy. schistosomiasis and other contagious diseases engulfed the Philippines. Alanned, Governor General Harrison issued a letter of instruction on proper waste disposal in all municipalities. Sometime in 1902, the PLUMBING TRADE was duly recognized by the government. The City of Manila was the model community. Master Plumber John F. Hass became the first Chief of the Division of Plumbing Construction and Inspection. Through the initiative of the Filipino Master Plumbers, a plumbing code based on the Plumbing Code of the United States was incorporated into the Building Code for the City of Manila. In 1935, Francisco Geronimo, Mariano de Ocampo, lgmidio Suarez, Eusebio Mina. Jose Rivera, Raymundo Reyes, Sr., Roberto Feliciano, Gregorio Lazaro, Raymundo Gumapac, John Jones, Trinitario Ortiz, Valentin Casupanan, Catalino Casupanan. Crispin F11Ulcisco, Teodoro Pastor, Cornelio Odvina and Jesus Tangbal Dera organized the National Master Plumbers Association of the Philippines (NAMP AP) and had it registered with the Securities and Exchange Commission. Initiated by N AMP AP, the Department of Public Services of the City of Manila was created by an Act of Congress. City Ordinance 2411, otherwise known as "the Plumbing ~ode forth~ City of Manila" was enacted in consultation with NAMPAP. The practice of plumbing was eventually placed under the Department of Public Services, Manila. The National Government, through the Bureau of Public Works, and other cities and municipalities adopted the Plumbing Code of Manila. NAMP AP spearheaded the enactment of a law regulating the practice of master plumbing in the Philippines. \iii  In 1954, the Third Congress of the Republic of the Philippines in its Second Session, approved after the third reading House Bill No. 962. This became Republic Act No.l378. On June 18, 1955, R.A. 1378, otherwise known as the "PLUMBING LAW OF THE PlillJPPINES" was signed by President Ramon Magsaysay. On January 28, 1959, the National Plumbing Code of the Philippines prepared by the NAMPAP was promulsated and approved by Malacai\ang. NAMPAP also assisted in the passage of the law creating the National Waterworks and Sewerage Authority (NAWASA). In 1966-1969, the Board of Examiners for Master Plumbers and the NAMPAP prepared a Cuniculum for Plumbing Engineering that was approved by the Department of Education and was first introduced at the Feati University. · On November 28, 1967, the First Amendment to the National Plumbing Code was approved, which effected the inclusion of "Asbestos·Cement Pipe" as an approved plumbing material. Before Martial Law in 1972, Republic Act No. 6541 otherwise known as the Building Code of the Philippines" was passed with the "National Plumbing Code of 1959" as referral code in full text. In 1996, NAMPAP President JAIME M. CABASE spearheaded the updating of the Revised National Plumbing Code. Finally, in October 1999, NAMPAP submitted the Draft Code to the Board of Master Plumbers (BOMP) Chaired by Engr. FORTIJNATO H. AMOSCO. After careful review, the Professional Regulation Commission under Chairman HERMOGENES POBRE adopted the Revised Plumbing Code of 1999 wruch His Excellency, President JOSEPH EJERCITO ESTRADA approved last December 21, 1999 pursuant to Section 4 ofR.A. 1378 known as the Plumbing Law. In order to continuously upgrade the technical expertise of Master Plumbers and propagate the growth of the plumbing industry; NAMPAP have caused the holding of regular National Convention as well as Regional Conferences such as LUZON, VJSAYAS and MINDANAO, as well as the Midyear Forum where manufacturers, dealers and suppliers of plumbing tools, equipment, materials and services are given the opportunity to conduct product presentations for the benefit of the plumbing practitioners. ix  Preface An adequate Plumbing Code is one of the most important governances in modem and healthful human existence. It involve the three basic necessities of life, such as: AIR, WATER and FOOD. The plumbing systems: water supply, sewage collection and disposal and stormwater drainage involve the right choice of materials, the economical design of the systems and their proper operation and maintenance. The supply of adequate hot, cold and chilled water, the efficient conveyance and disposal of wastewater such as food wastes and human excreta from plumbing fiXtures require provision of enough air, which will result to the efficient installation of the systems. Plumbing practice has grown in scope and magnitude with the progress in complexities of constructions such as high rise buildings with multi -level basement floors that now require electro- mechanical equipment and controls. The dwindling water resources intensify water use conservation. Modem or state-of-the-art plumbing installation now require the close coordination of works among Master Plumbers, Architects and Engineers to come up with the most efficient and economical plumbing installations. I wish to thank wholeheartedly those who have given their time in making available their expertises by discussing with us certain important aspects of this Revised National Plumbing Code of the Philippines. Many of them have unselfishly rendered invaluable assistance in criticizing and improving our text and for innumerable insights into this complex subject. Also, my thanks go to my wife CONCEPCION 0. CABASE for her untiring full support in pursuing this major activities of NAMPAP. JAIME M. CABASE l 1'NAMPAP NAMPAP National President Calooron City, Philippines May 3, 2000  Basic Principles The basic principles of the 1999 National Plumbing Code of the Philippines is an update of the tenets established in the "Plumbing Law of the Philippines" approved on 18 June 1955 as amended on 28 November 1959. The basic goal of the 1999 National Plumbing Code of the Philippines is to ensure the unqualified observance of the latest provisions of the plumbing and environmental laws. Principle No. 1 A11 premises intended for human habitation, occupancy or use shall be provided with a supply of pure and wholesome water, neither connected with unsafe water supplies nor subject to hazards of backflow or back-siphonage. Principle No. 2 Plumbing fixtures, devices and appurtenances shall be supplied with water in sufficient volume and at pressure adequate to enable them to function satisfactorily and without undue noise under all nonnal conditions of use. Principle No.3 Plumbing shall be designed and adjusted to use the minimum quantity of water consistent with proper perfonnance and cleaning. Principle No. 4 Devices for heating and storing water shall be so designed and installed as to prevent dangers from explosion through overheating. Principle No. 5 Every building having plumbing fixtures installed and intended for human habitation, occupancy or usc on premises abutting on a street, alley or easement where there is a public sewer, shall be connected to the sewer system. Principle No.6 Each frunily dwelling unit on premises abutting on a sewer or with a private sewage-disposal system shall have at least one water closet and one kitchen- type sink. Further, a lavatory and bathtub or shower shall be installed to meet the basic requirements of sanitation and personal hygiene..Principle No.7 Plumbing fixtures shall be made of smooth non·absorbent material, free from concealed fouling surfaces and shall be located in ventilated enclosures. Priaciple No. 8 - The drainage system shall be designed, constructed and maintained to safeguard against fouling, deposit of solids, clogging and with adequate cleanouts so arranged that the pipes may be readily cleaned. Principl~No. 9 - All pipings of plumbing systems shall be of durable NAMPAP- APPROVED materials, free form defective workmanship, designed and constructed by Registered Master Plumbers to ensure satisfactory service. ~nciple No. 10 - Each fixture directly connected to the drainage system shall be equipped with a water-sealed trap. xi Principle No. 11 The drainage piping system shall be designed to provide adequate circulation of air free from siphonage, aspiration or forcing of trap seals under ordinary use. Principle No. 12 - Vent terminals shall extend to the outer air and installed to preempt clogging and the return of foul air to the building. Principle No. 13 - Plumbing systems shall be subjected to such tests to effectively disclose all leaks and defects in the workmanship. Principle No. 14 - No substance which will clog the pipes, produce explosive mixture~ 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 - Proper protection shall be provided to prevent contamination of food, water, sterile goods and similar materials by backflow of se\vage. When necessary, the fixture, device or appliance shall be connected indirectly with the building drainage system. Principle No. 16 - No water closet shall be located in a room or compartment which is not properly lighted and ventilated. Principle No. 17 - 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 building sewage by some accepted method of sewage treatment and disposal, such as a septic tank. Principle No. 18 - Where a plumbing drainage system may be subject tb backflow of sewage, suitable provision shall be made to prevent its overflow in the building. Principle No. 19 - Plumbing systems shall be maintained in serviceable condition by Registered Master Plumbers. · Principle No. 20 - All plumbing fixtures shall be installed properly spaced, to be accessible for their intended use. Principle No. 11 - Plumbing shall be installed by Registered Master Plumbers with due regard to the preservation of the strength of structural members and the prevention of damage to walls and other surfaces through fixture usage. Principle No. 22 - Sewage or other waste from a plumbing system which may be deleterious to surface or sub-sutface waters shall not be discharged into the ground or into any waterway, unless first rendered innocuous through subjection to some acceptable form of treatment. xii  A REGISTERED MASTFR PLUMBER SHALL MAINTJ.JN A PROFESSIONAL BEARING CON~ 1 STENT WITH AN HONORABLE MTI DIGNIFIED PURSUIT OF HIS/HER PROFESSION, ADHERING TO A SET 0 1"7 CONDUCT BECOMING OF HIS/HER CALLING, AND SHALL NOT: 1. Act in an unprofessional manner and demand any remuneration other than his/her original charges except for additional services not covered in the basic contract; \ 2. Supplant another Registered Master Plumber after definite steps h::lve already been taken toward his/her being commissioned to perform the contract; 3. Underbid another Registered Master Plumber by reducing his/her professional fees after being informed of the 'Ccs charged by the other Registered Master Plumber; 4. Take the advantage of a salaried government position to compete unfairly with a practicing Registered Master Plumber; s. Allow the use of his/her License as Registered Master Plumber for a fee to an unlicensed Master Plumber in plumbing works without his jher personal supervision. 6. Injure falsely or maliciously, directly or indirectly, the reputation of another Registered Master Plumber by reviewing his/her work for the same client unless the professional services of the former have been officia lly terminated and 2-U professional fees have been fully paid by the client; 7. Advertise in self-lauda tory language, act in any manner and engage in any practice which tend to bring dishonor to the dignity of the Registered Master Plumber, the National Master Plumbers Association of the Philippines (NAMPAP) and the plumbing profession. xiii  Chapter 1 ADMINISTRATION Stction 100- PERMIT REQUIRED To ensure compliance of the provisions of this Code, the professional services of a Registered and Licensed Master Plumber shall be enlisted in accordance with Republic Act No. 1378, the "Plumbing Law". It shaH be unlawful for any person, firm or corporation, whether acting as principal, setvant, agent or employee, to do or cause to be done any plumbing or drainage work for which a permit is required without securing prior permit from the Office of lhe Building Official having jurisdiction under the Department of Public Works 3Ild Highways, Department of Interior & Local Government or City Mayors. - Section 101 -TO WHOM PERMITS MAY BE ISSUED No permit shall be issued to any person, fim1 or corporation, to do or c technical specifications and other required docwnents filed by an applicant for a permit shall be reviewed by the Administrative Authority. Other concerned departments which verify compliance with other applicable Jaws may review such plans. If the Administrative Authority finds that the work described in an appHcation for permit and the plans, specifications and other documents filed therewith conform to the requirements of the Plumbing Code and other pertinent laws and ordinances, and upon payment of the fees specified in Section I 05, a permit shaH then be issued to the Applicant. 2  Administration 103.1.2 When the Administrative Authority issues the permit he shall endorse in writing or stamp the plans and specifications as "APPROVED". Such approved plans and specifications shaH not be changed, modified or altered without authorization from the Administrative Authority and aU works shall be done in accordance with approved plans and specifications. 103.1.3 The Administrative Authority may issue a Partial Permit for the construction of a part of a large and/or complicated plumbing system before the entire plans and specifications for the whole system have been submitted or approved, provided adequate information and detailed statements have been filed, complying with all pertinent requirements of this Code. The holder of such partial permit may proceed at his ovm risk without assurance that the final permit for the entire building, structure or plumbing system will be granted. 103.2 Retention of Plans- One set of approved plans, specifications, computations and related data shall be retained by the Administrative Authority. Two (2) sets of approved plans, specifications and data shall be returned to the applicant a!ld Owner, one ( 1) set of which shall be kept at the jobsite at all times while the work is in progress. 103.3 Validity of Permit - The issuance of a permit or approval of plans and specifications shall not be construed as a permit to violate any provision of this Plumbing Code or of any other applicable ordinances. The issuance of a permit based on submitted plans. specifications or other documents shall not prevent the Administrative Authority from thereafter requiring the correction of errors on said plans, specifications and other documents.and from stopping an on-going plumbing installations violative of this Code or of other pertinent ordinances of this Jurisdiction. 103.4 Expiration- A plumbing permit issued under the provisions of this Code shall expire and become null and void if the plumbing work authorized therein is not commenced within one year from the date of such permit or if the plumbing work so authorized is suspended or abandoned at any time after having been commenced for a period of 120 days. In case of renewal of a plumbing permit, a fee equivalent to one-half the amount ofthe original fee shall be paid. 3  Revised National Plumbing Code of The Philippines *103.5 Suspension or Revocation - The Administrative Authority may, in Miting, suspend or revoke a permit issued under the provis:ons of this Code whenever issued in error or on the basis of incorrect information supplied or in violation of pertinent ordinances, rules and regulations. S«.tion 104- APPLICATION FOR EXISTING PI.lJMBING SYSTEM 104.1 Additions, Alterations or Repain - may be made to any existing plumbing system provided the addition, alteration or repair works confonn to requirements for a new plumbing sy~'tem. Additions, alterations or repairs shall not render an existing system unsafe, unsanitcuy or overloaded. 104.2 Changes in Building Occupancy- Plumbing systems which are a part of any building or structure undergoing a change in use or occupancy, as defined in the National Building Code, shall comply with all requirements of this Code applicable to the changed use or occupancy. 104.3 Maintenance - All plumbing systems, materials and appurtenances, both existing and new, and all parts thereof shall be maintained in proper operating condition. All devices or safeguards required by this Code shall be maintained in conformance with the existing Code edition at the time the plumbing system was installed. The owner or his designated agent shall be responsible for the maintenance of plumbing systems. To detennine compliance with this subsection, the Administrative Authority may cause the re-inspection of any plumbing system. 104.4 Moved Buildings -·- Plumbing systems, which are part of buildings or structures in one place and moved into another Jurisdiction. shall comply with the provisions of this Code for new installation. Sec. 153 NPC 1959 4  Administration Sfction 105 - INSPECTIONS 105.1 General - All plumbing systems for which permits are required by this Code shall be inspected by the Administrative Authority. No portion of any plumbing svstem shall be concealed until inspected and approved. The Administrative Authority or his representative shalt not be liable for expenses incurred in the removal and replacement of materials required to warrant proper inspection. When the installation of a plumbing system is complete, an additional and final inspection shall be made. Plumbing systems regulated by this Code shall not be connected to the water and energy fuel supplies nor to the sewer system tAntil authorized by the Administrative Authority and other Agencies concerned. AU AQ.01inistrative flumbing Personnel, Plurnbif!&.lnsoector shaH be a Registered an4. Licensed Master Plumb~r in accordance with the provision of Republic Act )378, otherwise, known as "Plumbing Law··. 105 2 Operation of Plumbing Equipment- The requirements of this Section do not prohibit the operation or use of any plumbing accessory installed to replace existing equipment or fixtures serving an occupied portion of the building when a request for inspection of such equipment or fixtures has been filed with the Administrative Authority not more than 72 hours after such replacement work is completed and before any portion of such plumbing system is concealed by any permanent portion of the building. 105 3 Testing of Systems - All plumbing systems shall be tested and approved as required by this Code or the Administrative Authority. 105 4 lnspec.tion Requests - It shaH be the duty of the person doing the plumbing work authorized by a permit to notify the Administrative Authority that such work is ready for inspection. The Administrative Authority requires that every request for inspection be filed at least three (3) working days before such inspection is intended. Such request shall be in writing and jointly signed by the Owner and the Registered and Licensed Master Plumber- Contractor. It shall be the duty of the person requesting inspections required by this Code to provide access to and means t{)r proper inspection of such work as well as provide all the equipment. the tools, power and water required tor the test. J(i5 5 Other lnspe-{tions - ln addition to the inspections required by this Code, the Administrative Authority may require othet mspections of the plumbing work to comply with the other provisions of this Code, other pertinent laws and ordinances enforced by the Administrative Authority.  REJVi&ed National Plumbing Code cA The PMippin l05.6 Rtiospedions 105.6.1 A fee will be charged on the Applicant for each inspection or re- insp~tion when a portion of the plumbing work for inspection is caJled for is not completed. 105.6.2 This provision shall not be interpreted as requiring re-inspection fees for the first time a job is rejected for failure to comply with the requirements of this Code, but as deterrent on the practice of calling for inspections before the job is ready for inspection or re-inspection. 105.6.3 Re-inspection fees shall be charged when the approved plans arc not readily available to the Inspector, for failure to provide access and facility on the date when the inspection is requested, or for deviating fro m plans requiring the approval of the Administrative Authority. 105.6.4 To obtain re-inspection, the Applicant shall file an application, in writing, on a form furnished for that purpose and pay the re-inspection fee. 105.6.5 In instances where re-inspection fees have been assessed, but pending payment of required fees, no re-inspection of the work will. be performed. Section 106- CONNECTION APPROVAL 106.1 Permanent Connections - no person shall install coMections to any water · supply line, sewer or storm drain systems as required by this Code and for which· other applications and permits are also required from other Agencies before· approval by the Administrative Authority. 106.2 Temporary Coonedions - Administrative Authority will endorse to other authorities or government agencies the issuance of temporary connections of the plumbing equipment to the water supply mai~ sewer main, power line and gas main for the purpose oftestjng the equipment. 6  Administration Section 107- SPECIAL PROVISIONS 107.1 All Licensed Master Plumbers registered in accordance with the provisions of Republic Act No. 1378 shall secure for themselves a seal of the standard size and type as required. The same shall be used on all plumbing applications for pemtitlJ and all plumbing plans prepan~d by Registered and Licensed Master Plumbers as well as on all documents required in the practice of their profession. The seal shall be round in shape and shall be inscribed with the following: 107. 1. I Registered and Licensed Master Plumber at upper portion of the round seal. 107.1.2 Name of Registered and Licensed Master Plumber at the upper center. 107.1.3 The registration number shall appear at the center below the name. 107.1.4 Philippines, appearing at the lower portion of the round seat Sldioa 108- PLUMBING FI.XT\JRES REQUIRED Each building shall be provided with sanitary facilities in accordance with best practice for mobility of disabled persons as provided in the National Building Code of the Philippines or by other government departments having jurisdiction. 7  Chapter 2 DEFINITIONS S«tioo 201 - GENERAL For the purpose of this Code, the following tenns shall bear the meanings indicated in this Chapter. No attempt is made to define ordinary words, used in accordance with their established dictionary meanings except where a word has been used loosely, that it becomes necessary to define its meaning as adopted in this Code to avoid misunderstanding. Since the primary purpose is to define tenns in general rather than nouns, th~ definitions are arranged alphabetically according to the first word of the term rather than the noun. Section 202 "'A" 202.1 ADS - Acrylonitrile-Butadiene·Styrene ALLEY - any public space. public park or thoroughfare less than three (3) meters but not less than two (2) meters in width dedicated or deeded for public use. -*202.3 ALTER or ALTERATION - any change, addition or modification i.1 construction or occupancy. 202.4 ACCESSmLE - when applied to a fixture, connection, appliance or equipment, shalt mean having access thereto, but which may require prior removaJ of an access panel, door or similar obstruction. "Readily accessible" shall mean direct access without the necessity of removing any panel, door or similar obstruction. 202.5 AIRBREAK_-· a physical separation. which may be a low inlet into the indirect waste receptor from the fixture, appliance or device indirectly connected. * Sec. I NPC 1959 8  Revised National Plumbing Code of The Philippines 202 6 AIR GAP, DRAINAGE - the unobstructed vertical distance through the free atmosphere between the lowest opening fiom any pipe, plumbing fixture, appliance or apputtenance conveying waste to the tlood level rim ofthe rcc~ptor. 202.7 AIR GAP, WATER DISTRmUTION- an unobstructed vertical distance through the free atmosphere between the lowest opening from any pipe or faucet conveying potable water to the tlood-level rim of any tank, vat or fixture. APPROVED - accepted or acceptable under an applicable specifications or standard stated or cited in this Code., or accepted as suitable for any proposed use under procedures and powers of the Administrative Authority. 202 9 APPROVED TESTING AGENCY - an organization primarily established t()r purposes of testing to approve standards and approved by the Administrati ve Autlwrity. 202. IO AUTHORITY, ADMINISTRATIVE - The Administrative Authority including the Building Ofiicial, the Commission, the Board and such other drpartment or agency established and authorized to administer and enforce the provisions of Republic Act 13 78 - The Plumbing Code of the Philippines, Presidential Decree No. 223~ as amended by P.D. 657 - creating the Professkmal Regulation Commission and prescribing its powers and functions, and Letter of Instruction No. 1000 - ordering and directing the Professiona\ Regulation Commission (PRC), the former Ministry of Human Settlements, the Departments of Foreign Affairs, Education and Culture, Public Works and Highways, Tourism, Transportation and Communication all SOOT agencies concerned, to authorize and support PRC Accredited Bonafide Professional Organizations only, and their members to organize, host, sponsor or rcprc~ent the Filipino Professionals in national, regional and international fora, conventions where the concerned professions arc involved; and further orders and directs that all government agencies and instrumentalities shall g.iv\.~ priority to bonafide members of the accredited prnft·s~;i\Hlal organizations in the hi1 in!l of its employees and engagement of prot~ssional services. Sec. 3 NPC IY5Y u Sec. -1.Vl'C 1959  Definitions Section 203 UB'' 203.1 BACKFLOW- the flow of water or other liquids, mixtures or substances into the distributing pipes of a potable wpply of water from any source other than from its intended source. 203.2 BACKFLOW CONNECTION - condition or any arrangement whereby reverse flow can occur. 203.3 BACKPRESSURE BACKFLOW - occurs due to an increased reverse pressure above the supply pressure. This may be due to pumps, boilers, gravity or other sources of pressure. 203.4 BACKFI.,OW PREVENTER - device or means to prevent flow of liquid from retuming to the source of supply. Also called vacuum breaker.... 203.5 BACK-SiPHONAGE - the flowing back of used, contaminated or · polluted water from a plumbing fixture or vessel into a water supply pipe due to a negative pressure in such pipe. See backflow. 203.6 BACKWATER VALVE - a device installed iri a drainage system to prevent reverse flow. ** 203.7 BACKVENT PIPE - the part of a vent line, which connects directly with an individual trap underneath or behind the fixture and extends to the branch or main vent pipe at any point higher than the fixture or fixture traps it serves. This is sometimes called an individual vent. See Revent pipe...... 203.8 BALL COCK - a valve opened and closed by the fall and rise, respective!y, of an attached ball floating on the surface of the liquid. ,..,..... 203.9 BALI, JOINT- a type of pipe connection in which a ball-shaped end is held in a cuplike shell and allows movements in every direction. 203.10 BATHROOM- a room equipped with a shower stall or bathtub. 203.11 BAITERY OF FIXTURES - any of two or more similar adjacent t! xtures which discharge into a common horizontal soil or waste branch...... "*** 203.12 BELL OR HUB - that portion of a pipe which, for a short distance, is suffi ciently enlarged to rt.~ceive the end of another pipe of the same diameter for the purpose of making rt caulked or push-on joi nt Sec. 5 NPC 1959 ** Sec. 6 NPC 1959 *** Sec. 7 NPC /959 **** Sec. 8 NPC 1959... ,... Sec. 9 NPC 1959 ****** Sec. 10 NPC 1959 ****** 5'e£:. 1 I NPC 1959 ******** S£~c. 12 NPC 1959 I(\  Revised National Plumbing Code of the Philippines 203.13 BENDING PIN (or IRON)- a tool for straightening or bending lead pipe. 203.14 BIBB- synonymous with faucet, cock, tap, plug, etc. The word "faucet" is preferred. u 203.15 BIDET - A plumbing fixtures used for washing the middle private part of the body, especially the genitals. Also called a "sitz" bath. 203.16 BLANK H.,ANGE- A pipe tlange that is not drilled for bolt holes. 203.17 BLIND FLANGE- a flange that closes the end of a pipe. There is no opening for the passage of liquid or gas. 203.18 BLOW·OFF - a controHed outlet of a pipeline to discharge liquid or detritus. 203.19 BOARO - the Licensure Board for Master Plumbers 203.20 BOILER BLOW-OFF- a valved outlet of a boiler that permits discharge of accumulated sediment. 203.21 BRANCH -- any part of the piping system other than a main, riser or stack..... 203.22 BRANCH INTERVAL- a length of soil or waste stack corresponding in general to a story height, but in no case less than 2.43 meters within which the horizontal branches from one floor or story of a building are connected to the stack 203.23 BRANCH, FIXTURE- see Fixture Branch 203.24 BRANCH, HORIZONTAL- see Horizontal Branch 203.25 BRANCH VENT- a hmizontal vent connecting one or more individual vertical back vents with the vent stack or stack vent. 203.26 BRAZED JOINT - any joint obtained by joining of metal parts with alloys which melt at temperatures higher than 449 degrees centigrade, but lower than t.he melting temperature of the parts to be joined. * Sec. I 3 NPC IV59 ** ~f·i(!c. J.l NJ>C !959 *** Sec. 15 NPC 1959 **** Sec. 16 NPC 1959 ***** Sec. 17 NPC lC 1959 ****Sec. 25 NPC 1959 ***** ,)'ec. 2() NPC 1959 ******Sec. 27 NPC 1959..***+*Sec. 28 NP(' 1959  Revised National Plumbing Code of the Philippines * 204.5 CESSPOOL - a non-watertight lined excavation in.thl! ground which receives the discharge of a sanitttry drainage system or part thereof, d~signed to retain the organic matter and solids discharging thcretrom, 0ut permitting the li4uid to seep through the bottom and sides of the cesspool. 204.6 CHASE- a vertical shaft for installarion of different pipe stacks. 204.7 CHECK VAl.VE- a valve that automatically closes to prevent the flow of liquid or gas in a reverse direction... 2048 CIRCUIT VENT - a group vent pipe which starts in front of the extreme fixture connection on a h01izontal branch and connects to the vent stack. Sec loop' vent, also. 204.9 CLARIFIER- Sec Interceptor. 204.10 CODF. -The word ''Code" or "this Code," when U5ed alone, shall mean these regulations, subsequent amendments thereto or any emergency rule or regulation which the Administrative Authority having jurisdiction may lawfully adopt. 204.11 COMMON VENT- sec unit vent and dual vent. 204.12 COMBINATION WASTE AND VENT SYSTEM - a specially designed system of waste piping embodying the horizontal wet venting of one or more sinks or floor drains by means of a common horizontal waste and vent pipe. adequately sized to provide free movement of air above the· flow line of the drain. 204.13 COMBUSTIBLE CONSTRUCTION - a structure which any part of it!> stmctural framework will ignite and burn at a temperature of 756 degrees centigrade or less. 204.14 COMMISSION -The Professional Regulation Commission (PRC). 204.15 COMMON - that part of a plumbing system designed and installed to serve more than one ( 1) appliance, fixture, building or system. 204.16 CONFINED SPACE·- a mom or space having a volume less than I 4 cu. m with 250 kilogram calorie of the aggregate input rating of all fuel- bmning applianc~s installed in that space *Sec. 29 NJ'(' 195Y ** s(!(:. Jo Nr·c 1959 St'C. 31 NJ'(' JI)5Y **** St c. 32 NPC /959 1.1  Definitions 204.17 CONTAMINATION - an impairment of the quality of the potable water which creates an actual hazard to the public health through poisoning or spread of disease by sewage, industrial fluids or waste. Also, defined as High Hazard... 204.18 CONTINUOUS VENT - a continuous vent is vertical vent that is a continuation of the drain to which the vent connects. 204.19 CONTINUOUS WASTE - a drain connecting the compartments of a set of fixtures to a trap or connecting other permitted fixtures to a common trap... 204.20 CONDUCfOR OR DOWNSPOUT- a vertical pipe to convey rainwater..... 204.21 CORPORATION COCK - a stop valve placed at the connection of the water service pipe to the water main. *"' 204.22 COURT- an open, unoccupied space, bounded on two (2) or more sides by the walls of the building. An inner court is a court entirely within the exterior walls of a building. All other courts are outer courts. 204.23 CRITICAL LEVEL- C-L or C/L marking on a backflow prevention device or vacuum breaker is a point conforming to approved standards (;:fld established by the testing laboratory (usually stamped on the device by the manufacturer) which determines the minimum elevation above the flood level rim of the fixture or rcceptable served where the device may 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 such approved device shaH constitute the critical level... 204.24 CROSS-CONNECfiON- any connection or arrangement, physical or otherwise, between a potable water supply system and any plumbing fixture or any tank. receptable, equipment or device, through which enables non-potable, used, unclean, polluted, contaminated water or other substances to enter into any part of such potable water system under any condition. *Sec. 33 NPC 1959 **Sec. 34 NPC' /95c. 39 :\PC /959 u -"ec. -13.\PC /95C 1959 ,)'ec. 120 NPC 1959..... Sec. 116 Nl'C 1959.. Sec. 121 NPC 1959 28  Hevised National Plumbing Code of tha Philippines 220.13 SIAMF..S.t: CONNECTION -· a huse fitting with clapper valves for combining the flow from two or more Jines of hose into a single stream. The inlet fitting of a fire standpipe located above ground level. 220.14 SIPHONAGE ··· a suction created by the t1ow of liquids m p1pes. A pressure less than atmospheric.... 220. IS · SHALL - the word "shall" denotes mandatory acceptation. 220.16 SHIELDED COUPLING- an approved clastomeric sealing gasket with an approved outer shield and a tightening mechanism. 220.17 SL"iGLE FAMILY D\\'ELLJNG- a building designed as a home by the owner of such building, and shalJ be the only dwelling located on a parcel of ground with the usual accessory building. 220.18 SIZE AND TYPE Oil~ TUBING -· see Diameter. 220.19 SLIP JOINT - an adjustable tubing connection, consisting of a compression nut, a friction ring, and a compression washer. designed to fit a threaded adapter fitting or a standard taper pipe thread. 220.20 SLOPE - see Grade... 220.21 SOIL STACK PIPE - a vertical soil pipe conveying fecal matter and. 220.22 wastewater. SOIL PIPE - any pipe, which conveys the discharge of water closet, urina! or fixtures having similar functions, with or without the discharges from other fixtures to the building drain or building sewer. %20.23 SOLDERED JOINT - a pipe joint obtained by joining metal parts with metallic mixtures or alloys which melt at a temperature below 427 degrees centigrade and above 149 degrees centigrade..,.!LO 24 SPIGOT - the end of a pipe which fits into a bell. Also a word used synonymousl y with faucet. =t).25 SPECIAL WASTES - wastes which require some special methods of handling such as thJiows: 315. 1. 1 Cast Iron SoiJ Pipe - Bell & Spigot and Hubless p1pe shall be supported at every storey or clo~er. 315.1.2 Snewed Pi1)e -· Iron Pipe Size (IPS) shall be supported at not less than every other storey height../· 3 15. I 3 Copper Tubing - shall be ~up ported at each storey or at max1mum intervals of J nwters on center. J 15.1.4 Lead Pipf... shall be supported at intervals not exc.eeding 1.20 meters at centers with a rigid vertical back-up ) 15. I. S Plastic Pipe ·· shall be supported at every one- ( 1) meter interval. 1152 Horizontal Piping J 15.2.1 Supports ··· hori zontal pipes shall be supported at sufliciently close intervals to keep them in alignment and prevent sagging. 315.2.2 Cast Iron Soil Pipe- Where joints occur, suspended cast iron soil pipe shall be supported at not more than 1. 5 meters intervals; except that pipe exceeding I. S meters length, may be supported at not more than J meters intervals. Supp011s shall be adequate to maintain alignment and to prevent sagging and shall be placed within 0.45 meters of the hub or joiat. Hubless or compression gasket joints must be supported at least at every other joint except that when the developed length between supports exceeds 1.2 meters, they shall be provided at  each joint Support shall also be provided at each horizontul branch coMection, placed on or immediately adjacent to the ' ::; ~~:!!s. Suspended lines shall be suitably braced to prevent l.. i.; ~tal movement. 315.2.3 Screwed Pipe- IPS except as provided in other Sections of this Code, shall be supported at approximately 3.0 meters intervals for piping 19.mm diam.eter and smaller and 3.6 meters intervals for piping 25 mm and larger in diameter. 315.2.4 Copper Tubing - shall be supported at approximately 1.8 t:-t~~ :-: :..:· 11 intervals for piping 38 mm diameter and smaller and 3.0 meters in!-::rvc'.n for pipings 51 mm and larger in diameter. 315.2.5 uad Pipe - shall be supported by stiff metal or wooden backing for its entire length with hangers properly spaced. 315.2.6 In Ground - piping buried in the ground shall be laid on a flTYll bed for its entire length, except where concrete cradle support is provided, which is adequate and approved by the Administrative Authority. 315. 2.7 Plastic Tube - sh~l be supported by stiff metal or wood backing with hangers in its entire length for small-size tubings up to 38 mm diameter and without backings but with spaced metal hangers at approved spacing for larger-size tubings. 315.3 Hangers and Anchon 3 I 5.3.I Materials - for hangers and anchors shall be of sufficient strength to maintain their proportional share with the weight of the pipe and its content. 3 I 5.3.2 All pipings, fixtures and equipment shall be adequately anchored or supported to the satisfaction of the Administrative Authority. Section 316 - TRENCHING, EXCAVATION AND BACKFILL 3 l 6.1 Tunneling and driving may be done in yard, court or driveway of any building site. Where there is suffici ent depth, tunneling may be used between open cut trench~s. Tunnels shall have a clear height of 0.6 meter above the pipe and hall be limited in le ngth to one-half (1/2) the :iepth of the trench, wd. a maximum length of 2.4 meters. When pi pe is driven, the drive pi. l· shall be at least one pipe size larger than the pipet;:> be laid. 41  R~visod National Plumbing COde of the Philippines )16.2 Open Trenches - all excavations required to be made for the installation of a building drainage system or any part thereof, within the walls of a building, shall be open trench work and kept open until the piping has been inspected, tcs!ed and accepted. 316 3 All excavations shaH he completely back-tilled as soon as possible after inspection. Adequate precaution shall be taken to ensure proper compactness of backfill around pipes without damage to such pipe Trenches shall be back-filled in thin layers of0.3 meter above the top of the pipe with clean earth which shall not contain stones, boulders, cinders ~ other mate.rials which can damage or break the pipes or cause con:osfve action. Mechanical devices or equipment such as bulldozer, grader, etc., may then be used to complete the back-filhng to grade. The filling shall be properly compacted Suitable precautions shall be taken to ensure permanent stability for pipes la.id in filled or made ground.  Chapter 4 PLUMBING FIX1,URES Section 401 - MATERIALS- GENERAL REQUIREMENTS Quality of Fixture8 - plumbing fixtures shall be manufactured of dense, durable, non-absorbent materials an.d must have smoot~ impervious surfaces, free from unnecessary concealed fouling surfaces. Except as permitted elsewhere in this Code. all fixtures shall conform in quality aad design to nationally recognized applicable standards or to other approved standards acceptable to the Administrative Authority. All porcelain enamel swfaces on plumbi.ng fixtures shall be acid resistant (for the convenience of users of this Code, a list of generally accepted Plumbing Fixtures is included in Table 14-4 Plumbing Material Referenced Standards.) Water doset bowls fur public use shall be the elongated bowl types equipped with open-front seats. Water closet seats shall be of smooth non·absorbent material and properly sized for the water closet bowl used. Section 402 - MATERIALS- ALTERNATIVES Special-use fixtures may be made of soapstone) chemical stoneware or may be lined with lead, copper base alloy, nickel-copper alloy, corrosion-resisting steel or other materials specially suited for the use which the fixture is intended. Restaurant kitchen and other special-use sinks may be made of approved-type bonderized and galvanized sheet steel of not less than Gauge No. 16 U.S. B&S or 1.6 mm thick. All sheet metal plumbing fixtures shall be adequately designed, constructed and braced in an approved manner to satisfactorily accomplish th~ intended purposes. Section 403 - OVERFLOWS When any fixture is provided with an overflow outlet,.the waste shall be so arranged that the standing water inside the fixture cannot rise inside the overflow way when the stopper is closed nor remain inside the overflow way when the fixture is empty. The overflow pipe from a fixture shall be connected to the house or inlet side of the fixture trap. Water Closet or Urinal flush tanks shall discharge into the bowls or wares served by them, but it shall be unlawful to connect such overflows with any other part of the drainage system. Sec. 205 NPC /959 Sec. 210 NPC 1959 42  Revised l'rotional Plumbing Code ~ the Philippines Stction 404- STRAINERS AND CONNEL"TTONS 404.1 Straiuen -all plumbing fixtures other than water closets and siphon action washdown or blowout urinals, shall be equipped with approved strainers having an approved w?Jerway area. The strainers serving shower drains shall have waterway equivalent to the area of the tailpiece~ (meaning, the sum of all the areas of the perforations of the strainer is equivalent to the outlet area). 4:J4.2 Connections - Fixtures having concealed slip joint connections shall be provided with an access panel or utility at least 0.3 meter in its least dimension and arranged so that the O" 12 I per 12 Add I fixtun: for each Over I 50, add Over ISO, add I fixture for additiO!lB.l 25 males (on:r I liXIure !'Or each additional20 males 'I 10) and I for ateh additional 20 females (over _!!) each additional 50 mllle:s and I for each IS a~ 3: -' 6-55 4: 36-55 for c.'11~.:h Ovcr 55, add l iixturc lor P.dilitional 50 each additi~J.!!_~~- 40 ~son;>_ ~~lcs Penal lnsliruuon - r or Prison usc bloc.k floor i Cell 1 per cell I pc:r cell I Exercise Room l per e>;err 30 1 per 75 12 Malt>: Fe~nale. ~,ftC. ) Male I pel' 40 l·emalc I per 30 1 p..:r 40 I pa- 30 p-~uPlaces Male Female' ~ l pa-25 I per 2 water closets 1 per 7517 £-Ja;tJtional and 1 per 25 1 per 75 '.J,;:!Yities Uni~ 2: !26-250 2: 76-125 ~ : 126-250 ~pPiaccs Male F~.·matc'~ 1 p.:r I SO 1 J'C!f l wttiLT closets I per7S'- ~1001 lp:~_!?O I pc! 75 \tno."·er unnals are prO\ tded, one ( l) water closet ts subtracted Irom the number specified on the table, ~that the number of water closets in such cases shall not be reduced to less than lwo-tttirds (2/3) of tc Jlli-'limum specified. The fibures sho·,..n are based upon one (I) f.ixt~m: bcing the minimwn n..oquired for the nwnber of pe~scns indicated or any fediiln then-of Building categ01is not sho\\U on this table shiD.I be 1:0n5idered separately by the Administrative Authority. Drinking Jount.ai..ns shall not be installed in toilet n.x11ns. Laundry truys. One (I) lntu\dry tray or one ( 1) automatic washer standpipe for each dwelling writ IJf twt> (2) luw1dry tray:; or two automati.; washer standpipes, or t:ombin::tion thCI'eOf, for each ten (10) apartments. Kitchen sinks. one ( 1) I"Or cal~h dwelling or apurtmmt Wlit. As rt.:·quin:d by ANSllA. l, Sanil.tltion in Places ()f Emplo}n1e11t. Wllere there is exposure to skin contamination v.-ith poisonous, infectiou~, or irritating materials, provide one (l) Javatoty for each five·- (5) persons.. W~tk 6{)9 6 nun or "'ac;h sink 457.2-mm diameter a cif(:ular be.sin, when provided \\ith water outlets for such space, shall be considered equivalent to one (I) lavatory. Laundr)· trays, one (I) for ea.:h fifty (50) perl! NP(' 195Y  Water Supply and Distrib~.>tion 603.2 Backflow Prevention Devices, Ass~mblies, and Methods 603.2.1 Airgap - the minimum airgap to provide backflow protection shall be in accordance with the Table 6-1. 603.2.2 Atmospheric Vacuum Breaker (AVB) - consists of a body, a checking member and an atmospheric opening. 603.2.3 Double Check Valve Backflow Prevention Assembly (DC) consists of two independently acting internally or externally loaded check valves, four properly located test cocks with cormectors and two isolation gate valves. 603.2.4 Pressure Vacuum Breaker Backflow Prevention As!embly (PVB)- consists of a loaded air inlet valve, an internally loadt1ona1Plumbi o Code of the Philippines tlh 8 Size of Branrhes. The number of fixture units handled by a branch shal l detem1ine the size of tbat branch, fol lowing the methods outlined in subs...-ction 609.7 of this section. "-~ 9 Si·Ling for Flushoml."'ael' Valves. Bratlches and snains serving water dosets or s\m ilar tlushometer valves may be ~ 1 zed from Table 6-6 when the values in Table 6-4 are assigned to ca1.:h tlushomcter valve beginning with the most remot e valve in ea ~.:h hmnch. Any sy s~':m using f1ushometer valves may be sized also by the procedures set fo11h in Appendix A (Recommended rules for sizing the water supply system). Piping supplying a flushomcter valve ~hall not be less in size than the valv l! inlet. TABlE 6-4 Flushometcr Fixture Units for Water Sizing Using Table 1 :~re Cat~or~e~ ___ A ---- Number of Flushomcter Valves l 2 Fixture Units Assignt d f0r Water Clm;e.ts and Similar Fixtures 40 70 Fixtures Units Assigned for Urinals and Similar Fixtures 20 35 1 ~ l......~.... ~ 3 90 45 ~ ~ 4 105 53 5 or more 115 plus I 0 tor each 58 plus 5 for each !{19.10 additional fixture lfl excess of5 additional fixture II\ excess of 5 Sizing Systems for Flushomrter Tanks. The size of branches and mains I ~erving flu shomcter tanks shaH be consistent with the sizing procedures for tlush tank water closets. (.09 ll Sizing syst. nd of such shape and capacity to prevent splashing or flooding and shall be located where readily accessible for inspection and cleaning. No standpipe receptOr for any clotheswasher shaH extend more than 0.8 meter nor less than 0.45 m above its trap. No trap for any clotheswasher standpipe receptor shall be installed below the floor, but shaH be roughed no less than 15 em and. not more than 45 em above the flo or. No indirect waste receptor shall be installed in any toilet room, closet, cupboard or storeroom nor in any other portioil of tcs, or other discharges under pressure shall be directly connected to any part ofthe drai11age system. The foregoing shall not apply to any approved sump pump or to any approved pressure-wasting plumbing fixture or device when the Administrative Authority has satisfied himself that the drainage system i~ ad'O!quately sized to accommodate the anticipated discharge thereof Section 806 - STERll,J«: EQU IPl\tENT Appliances, devices or apparatus such as stills, sterilizers and similar equipment requiring water and waste and used for sterile material~ shall be drained through an a!rgap. Section 807- APPLIANCES 807.1 Appliances, devices, equipment or other apparatus not regularly classified a3 plumbing fixtures equipped with pumps, drips or drainage outlets may be drained by indirect waste pipes discharging into an approved-type opeD. receptor. 807.2 When the cond~nsate waste from air conditioning coils is discharged b ; direct connection to a lavatory tailpiece or to an approved accessible inlet 0; a bathtub overflow, the cormection shali be located in the area controlled h the same person controlling the air conditioned space. ' 807.3 When undiluted condensate waste from a thcl buming condensing applianc~ is discharged into the drainage system ~he material in the dra!nag.e syste;:; shall be rast iron, galvanized iron, plastic or other materials approved f:,, t.his use. 92  Revisad National Plumbing Code d the Philippin~ Exceptions: 807.3.1 When the above condensate is discharged to an exposed fixture tailpiece and trap. s11ch tailpiece and trap may be brass. 807.3.2 Any materials approved in Section 701 may be used when, in the opinion of the Administrative Authority, condensate waste from a fuel burning condensing appliance is diluted either before or after discharge into the drainage.\)'Stem. 807.4 No domestic dishwashing machine shall be directly connected to a drainage system of food waste disposer without the use of an approved dishwasher airgap fitting on the discharge side of the dishwt.shing machine. Listed airgaps shall be installed with the flood level (FL) marking at or above the flood level of the sink or drainboard, whichever is higher. Stdion 808 -· COOLING \VATER When permitted by the Department having jurisdiction, clean running water used exclusively as a cooling medium in an appliance, device or apparatus, may discharge into the drainage system through the inlet side of a fixture trap in the event that a suitable fixture is not. available to receive such discharge. Sud1 trap connection shall be by means of a pipe connected to the inlet side of an approved fixture trap, the upper end terminating in a funnel shaped receptacle set adjacent, a.TJd not less than !52 mm above the overflow· rim of the fu ture. Section 809- DRINKING FOUNTAINS Drinking fountains may be installed with indirect wastes. 93 Section 810- STEAM AND HOT WATER I)R-\INAGE CONDENSERS AND SU1\1PS 810.1 No steam pipe shall be directly connected to any part of a plumbing or drainage system, nor shall any water having a temperature above 60°C be discharged under pressure directly into any part of a drainage system. Pipes from boilers shall discharge by means of indirect waste piping as detennined by Administrative Authority or the boiler manufacturer's recommenda.tions. Such pipes may be indirectly connected by discharging into an open or closed condenser or intercepting sump of approved type that will prevent the entrance of steam or such water under pressure into the drainage system. All closed condensers or sumps shall be provided with a vent taken off from the top and extended separately, full size above the roof. All condensers and sumps shall be properly trapped at the outlet with a deep seal trap extending to within 152 mm of the bottom of the tank. The top of the deep seal trap shall have a 19 rnm diameter opening located at the highest point of the trap to serve as a siphon breaker. Outlets shall be tr.ken off from the side in a manner to allow a water line to be mai ntained that permanently occupies not less than one-half( 'l2) the capacity of the condenser or sump AJI inlets shall enter above the water line. Wearing plates or baftles shall be installed in the tank to protect the shell. The sizes of the blowoff line inlets, the water outlets and the vent shall be as shown in Table 8-l. The contents of condensers receiving steam or hot water under pressure must pas~ first through an open sump before entering the drainage system. 810.2 Sumps, condensers or intercepting tanks constructed of concrete shall have walls and bottom not less than 102 mm thickness, and the inside shall be cement plastered not less than 13 mm in thickness. Condensers constructed of metal shall be not less than No. 12 U.S. Standard gauge (2.77 men thickness) and all such metal condensers shall be protected from exten:al corrosion by an approved bituminous coating. 810.3 Sumps and condensers shan be provided with suitable means of access for cleaning and shall contain a volume of not less than twice the volume of water removed from the boiler or boilers connected thereto when the normal water level of such boiler or boilers is reduced not less than 102 mm. 94  Re\ti5ed Nationel Plumbing Code of the Philippines TABLES..l PIPE CONNECTIONS lN BLOWOFF CONDENSERS AND SUMPS No. Boiler Blowoff, mm Water Outlet, mm Size of Vent, mm 1 19 19 51 2 25.4 25.4 64 3 32 32 76 4 38 38 102 5 51 51 127 6 64 64 I 52 * To he used only with hoi/as of 9.29 m2 ofheatmg surface or less. Srction 811- CHEMICAL WASTES 811.1 Chemical or industrial liquid wastes likely to damage or increase maintenance costs on the excreta sewer system, detrimentally affect sewt.ge treatment or contaminate surface or subsurface waters, shall be pretre:1ted to render them innocuous prior to their discharge into a drainage system. Detailed plans and specifications of pretreatment facilities shaH be requir~d by the Administrative Authority. Piping conveying industrial. chemical or process wastes from their point of origin to sewer-connected pretreatment facilities !iliall be of such material and design to adequately perform its intended function to the satisfaction of the Administrative Authority. Drainage discharge piping from pretreatm~nt facilities or intercep.tors shall conform to standard drainage installation procedure. 811.2 Each waste pipe receiving or intended to receive the discharge of any fixture where acid or coiTosive chemical is placed and each vent pipe connected thereto, shall be constructed of chemical-resistant glass-lined pipe, high silicon iron pipe, lead pipe not less than 3.2 mm wall thickness, an approved type of ceramic glazed or unglazed vitrified clay or other approved corrosion resistant rnaterit:!IS. 95  indirect Waste Piping, Wet-Vented Systems and Special Wastes 811.3 Ali jointing materials shall be of approved type and quality. 811.4 Whenever practicable, nH piping shalt be readily accessible and installed with the maximum of clearance from other services. 811.5 The owner shall make and keep a permanent record of the location of all pipings and venting carrying chemical waste. 811.6 No chemical vent shall be connected or intersect vents fo r other services. 811.7 No chemical wastes shall be discharged into the ground, local sewer or other disposal means without approval of the local Administrative Authority. 811.8 The provisions of this Section reiative to materials and methods of construction, need not apply to minor installations such as small photographic or x-ray dark rooms or small research or control laboratories where small amounts uf adequately water-diluted chemicals are disch.::rged Section 812- VERTICAL WET VENTING 812. 1 \Vet venting is limited to vertical drainage piping receiving the ctischarg ~ from the trap arm of one (1) and two (2) fixture unit. Fixtures that a\~o serves as a vent for not to exc~d four (4) fixtures. All wet-vented fi xtu~cs shall be on the same floor level, provided further, that fixtures 'Nith a continuous vent discharge into a wet vent shall be on the same level ;;.s the wet-vented ftxtures. 812.2 The vertical piping between any two (2) consecutive inlet levels shall be- considered a wet-vented section. Each wet-vented section shall be a minimum of one (I) pipe size larger than the required minimum waste pipe size of the upper fixture or shall be one (I) pipe size larger than the required minimum pip~ size for the sum of the fixture units served by such wet. vented section, whichever is larger, but in no case less than S I mm in diameter. 812.3 Common vent sizing shall be the sum of the fixture units served but in no case smaller than the minimum vent pipe size require'j for rmy fixttre served, or by Section 904. Section 813 -·SPECIAL Vl:NTING FOR ISLAND FIXTURES Traps for island sinks and similar equipment shall be roughed~in above the floor and may be vented by extending the vent as high as possible, but not less than the drainboard height and then returning it downward and connecting it to the horizontal sink drain immediately downstream from the vertical fixture drain. The retumed vent shall be connected to the horizontal drain through a wye-branch fitting and shall, in addition, be provided with a foot vent taken oft' the vertical fixture vent by means of a wye--branch immediately below the floor and thence extending the vent line to the nearest partition and then through the roof to the open air or may be connected to other veats at a point not less than 152 mm above the flood level rim of the fixtures served. Drainage fittings shall be used on all parts of the vent below the floor level and such a vent line shall have a minimum slope of 2 percent or 21 mrnlm back toward the drain where it is connected shall be maintained. The retum bend used under the drainboard shall be a one ( 1) piece fitting or an assembly of a forty-five (45) degree elbows. Pipe sizing shall be as elsewhere required in this Code. The island sink drain. upstream of the returned vent, shall serve no other fixtures. Acansion.!oints -- Expansion joints shall be accessible, except for vent and stacks, and is used in soil and waste stacks to provide tor necessary expansion and txmtraction joints of the pipes for high-rise buildings. In all cases such jl)ints shall be tree and accessible l304.4 Unions-· Approved unions may he used in drainage work when accessibly locatf;d in the traJ> s~a! or between a tixturc and its trap; in th;: vent system except underground or in wet vents, at a.,ges Fitt:cgs CCiass IS~--- J B 16 ·2.~----- j L ~ ~ j______ _j I I I ' I. I ~: (asr Br:lSS and Tubi~~ P-Traps r I : I l PS 2 i -~~--.l.---.J_ ~~ote 4 ! I : ! ' I ~! I j ; I I I I I : ! ' ?-' (~.~.~::opp:_~~- A_!l_