History of Plumbing PracticeThe birth of the plumbing professionin the Philippines is traced back to the 17th century. The WALI .EDCITY known as Intramuros was established by the Spaniards as amodel conununity. The Friar Engineers who built the governmentbuildings, residential and other structures. incorporated Europeanstandards in their plumbing installations.During the 18th and 1cJhcenturies, the Filipino plumbers were assigned the task ofmaintaining, repairing and/or remodeling plumbing systems in all"pueblos" or towns including churches, convents and governmentbuildings.
The recognized plumbers then were called upon by the''ilustrados" or the elite group to act as consultants of plumberjourneymen on matters pertaining to plumbing installations invillas and mansions. PLUMBING took a great lr.-ap at the tum of the20th century with theo arrival of the American soldiers, engineers,Thomasite teachers, doctors and evangelists. Health and hygienebecame priority when epidemics including cholera, leprosy.schistosomiasis and other contagious diseases engulfed thePhilippines. Alanned, Governor General Harrison issued a letter ofinstruction on proper waste disposal in all municipalities.Sometime in 1902, the PLUMBING TRADE was duly recognized by thegovernment. The City of Manila was the model community. MasterPlumber John F. Hass became the first Chief of the Division ofPlumbing Construction and Inspection. Through the initiative of theFilipino Master Plumbers, a plumbing code based on the PlumbingCode of the United States was incorporated into the Building Codefor the City of Manila.In 1935, Francisco Geronimo, Mariano deOcampo, lgmidio Suarez, Eusebio Mina. Jose Rivera, Raymundo Reyes,Sr., Roberto Feliciano, Gregorio Lazaro, Raymundo Gumapac, JohnJones, Trinitario Ortiz, Valentin Casupanan, Catalino Casupanan.Crispin F11Ulcisco, Teodoro Pastor, Cornelio Odvina and JesusTangbal Dera organized the National Master Plumbers Association ofthe Philippines (NAMP AP) and had it registered with the Securitiesand Exchange Commission.
Initiated by N AMP AP, the Department of Public Services of theCity of Manila was created by an Act of Congress. City Ordinance2411, otherwise known as "the Plumbing ~ode forth~ City of Manila"was enacted in consultation with NAMPAP. The practice of plumbingwas eventually placed under the Department of Public Services,Manila. The National Government, through the Bureau of PublicWorks, and other cities and municipalities adopted the PlumbingCode of Manila. NAMP AP spearheaded the enactment of a lawregulating the practice of master plumbing in the Philippines.
\iii
In 1954, the Third Congress of the Republic of the Philippinesin its Second Session, approved after the third reading House BillNo. 962. This became Republic Act No.l378. On June 18, 1955, R.A.1378, otherwise known as the "PLUMBING LAW OF THE PlillJPPINES" wassigned by President Ramon Magsaysay.
On January 28, 1959, the National Plumbing Code of thePhilippines prepared by the NAMPAP was promulsated and approved byMalacai\ang. NAMPAP also assisted in the passage of the lawcreating the National Waterworks and Sewerage Authority(NAWASA).
In 1966-1969, the Board of Examiners for Master Plumbers and theNAMPAPprepared a Cuniculum for Plumbing Engineering that wasapproved by the Department of Education and was first introduced atthe Feati University. On November 28, 1967, the First Amendment tothe National Plumbing Code was approved, which effected theinclusion of "AsbestosCement Pipe" as an approved plumbingmaterial. Before Martial Law in 1972, Republic Act No. 6541otherwise known as the Building Code of the Philippines" was passedwith the "National Plumbing Code of 1959" as referral code in fulltext.In 1996, NAMPAP President JAIME M. CABASE spearheaded theupdating of the Revised National Plumbing Code. Finally, in October1999, NAMPAP submitted the Draft Code to the Board of MasterPlumbers (BOMP) Chaired by Engr. FORTIJNATO H. AMOSCO. Aftercareful review, the Professional Regulation Commission underChairman HERMOGENES POBRE adopted the Revised Plumbing Code of 1999wruch His Excellency, President JOSEPH EJERCITO ESTRADA approvedlast December 21, 1999 pursuant to Section 4 ofR.A. 1378 known asthe Plumbing Law.
In order to continuously upgrade the technical expertise ofMaster Plumbers and propagate the growth of the plumbing industry;NAMPAP have caused the holding of regular National Convention aswell as Regional Conferences such as LUZON, VJSAYAS and MINDANAO,as well as the Midyear Forum where manufacturers, dealers andsuppliers of plumbing tools, equipment, materials and services aregiven the opportunity to conduct product presentations for thebenefit of the plumbing practitioners.
ix
PrefaceAn adequate Plumbing Code is one of the most importantgovernances in modem and healthful human existence. It involve thethree basic necessities of life, such as: AIR, WATER and FOOD. Theplumbing systems: water supply, sewage collection and disposal andstormwater drainage involve the right choice of materials, theeconomical design of the systems and their proper operation andmaintenance. The supply of adequate hot, cold and chilled water,the efficient conveyance and disposal of wastewater such as foodwastes and human excreta from plumbing fiXtures require provisionof enough air, which will result to the efficient installation ofthe systems. Plumbing practice has grown in scope and magnitudewith the progress in complexities of constructions such as highrise buildings with multi -level basem*nt floors that now requireelectro- mechanical equipment and controls. The dwindling waterresources intensify water use conservation. Modem orstate-of-the-art plumbing installation now require the closecoordination of works among Master Plumbers, Architects andEngineers to come up with the most efficient and economicalplumbing installations. I wish to thank wholeheartedly those whohave given their time in making available their expertises bydiscussing with us certain important aspects of this RevisedNational Plumbing Code of the Philippines. Many of them haveunselfishly rendered invaluable assistance in criticizing andimproving our text and for innumerable insights into this complexsubject. Also, my thanks go to my wife CONCEPCION 0. CABASE for heruntiring full support in pursuing this major activities ofNAMPAP.
JAIME M. CABASE l1 'NAMPAPNAMPAP National President
Calooron City, Philippines May 3, 2000
Basic PrinciplesThe basic principles of the 1999 NationalPlumbing Code of the Philippines is an update of the tenetsestablished in the "Plumbing Law of the Philippines" approved on 18June 1955 as amended on 28 November 1959. The basic goal of the1999 National Plumbing Code of the Philippines is to ensure theunqualified observance of the latest provisions of the plumbing andenvironmental laws. Principle No. 1 A11 premises intended for humanhabitation, occupancy or use shall be provided with a supply ofpure and wholesome water, neither connected with unsafe watersupplies nor subject to hazards of backflow or back-siphonage.Principle No. 2 Plumbing fixtures, devices and appurtenances shallbe supplied with water in sufficient volume and at pressureadequate to enable them to function satisfactorily and withoutundue noise under all nonnal conditions of use. Principle No.3Plumbing shall be designed and adjusted to use the minimum quantityof water consistent with proper perfonnance and cleaning. PrincipleNo. 4 Devices for heating and storing water shall be so designedand installed as to prevent dangers from explosion throughoverheating. Principle No. 5 Every building having plumbingfixtures installed and intended for human habitation, occupancy orusc on premises abutting on a street, alley or easem*nt where thereis a public sewer, shall be connected to the sewer system.Principle No.6 Each frunily dwelling unit on premises abutting on asewer or with a private sewage-disposal system shall have at leastone water closet and one kitchentype sink. Further, a lavatory andbathtub or shower shall be installed to meet the basic requirementsof sanitation and personal hygiene . .Principle No.7 Plumbingfixtures shall be made of smooth nonabsorbent material, free fromconcealed fouling surfaces and shall be located in ventilatedenclosures.
Priaciple No. 8 - The drainage system shall be designed,constructed and maintained to safeguard against fouling, deposit ofsolids, clogging and with adequate cleanouts so arranged that thepipes may be readily cleaned.Principl~
No. 9 - All pipings of plumbing systems shall be of durableNAMPAPAPPROVED materials, free form defective workmanship, designedand constructed by Registered Master Plumbers to ensuresatisfactory service. No. 10 - Each fixture directly connected tothe drainage system shall be equipped with a water-sealed trap.
~nciple
xi
Principle No. 11 The drainage piping system shall be designed toprovide adequate circulation of air free from siphonage, aspirationor forcing of trap seals under ordinary use. Principle No. 12 -Vent terminals shall extend to the outer air and installed topreempt clogging and the return of foul air to the building.Principle No. 13 - Plumbing systems shall be subjected to suchtests to effectively disclose all leaks and defects in theworkmanship. Principle No. 14 - No substance which will clog thepipes, produce explosive mixture~ destroy the pipes or their jointsor interfere unduly with the sewage-disposal process shall beallowed to enter the building drainage system. Principle No. 15 -Proper protection shall be provided to prevent contamination offood, water, sterile goods and similar materials by backflow ofse\vage. When necessary, the fixture, device or appliance shall beconnected indirectly with the building drainage system.PrincipleNo. 16 - No water closet shall be located in a room or compartmentwhich is not properly lighted and ventilated.
Principle No. 17 - If water closets or other plumbing fixturesare installed in buildings where there is no sewer within areasonable distance, suitable provision shall be made for disposingof the building sewage by some accepted method of sewage treatmentand disposal, such as a septic tank.Principle No. 18 - Where aplumbing drainage system may be subject tb backflow of sewage,suitable provision shall be made to prevent its overflow in thebuilding.
Principle No. 19 - Plumbing systems shall be maintained inserviceable condition by Registered Master Plumbers. Principle No.20 - All plumbing fixtures shall be installed properly spaced, tobe accessible for their intended use.
Principle No. 11 - Plumbing shall be installed by RegisteredMaster Plumbers with due regard to the preservation of the strengthof structural members and the prevention of damage to walls andother surfaces through fixture usage.Principle No. 22 - Sewage orother waste from a plumbing system which may be deleterious tosurface or sub-sutface waters shall not be discharged into theground or into any waterway, unless first rendered innocuousthrough subjection to some acceptable form of treatment.
xii
A REGISTERED MASTFR PLUMBER PROFESSIONAL BEARING CON~ 1 STENTWITH DIGNIFIED PURSUIT OF HIS/HER PROFESSION, CONDUCT BECOMING OFHIS/HER CALLING, AND
SHALL MAINTJ.JN A AN HONORABLE MTI ADHERING TO A SET 0 1"7 SHALLNOT:
1.
Act in an unprofessional manner and demand any remunerationother than his/her original charges except for additional servicesnot covered in the basic contract;\
2.
Supplant another Registered Master Plumber after definite stepsh::lve already been taken toward his/her being commissioned toperform the contract; Underbid another Registered Master Plumber byreducing his/her professional fees after being informed of the 'Ccscharged by the other Registered Master Plumber; Take the advantageof a salaried government position to compete unfairly with apracticing Registered Master Plumber; Allow the use of his/herLicense as Registered Master Plumber for a fee to an unlicensedMaster Plumber in plumbing works without his jher personalsupervision. Injure falsely or maliciously, directly or indirectly,the reputation of another Registered Master Plumber by reviewinghis/her work for the same client unless the professional servicesof the former have been officia lly terminated and 2-U professionalfees have been fully paid by the client; Advertise in self-laudatory language, act in any manner and engage in any practice whichtend to bring dishonor to the dignity of the Registered MasterPlumber, the National Master Plumbers Association of thePhilippines (NAMPAP) and the plumbing profession.
3.
4.
s.
6.
7.
xiii
Chapter
1
ADMINISTRATION Stction 100- PERMIT REQUIRED To ensure complianceof the provisions of this Code, the professional services of aRegistered and Licensed Master Plumber shall be enlisted inaccordance with Republic Act No. 1378, the "Plumbing Law".It shaHbe unlawful for any person, firm or corporation, whether acting asprincipal, setvant, agent or employee, to do or cause to be doneany plumbing or
drainage work for which a permit is required without securingprior permit from the Office of lhe Building Official havingjurisdiction under the Department of Public Works 3Ild Highways,Department of Interior & Local Government or CityMayors.Section 101 -TO WHOM PERMITS MAY BE ISSUED
No permit shall be issued to any person, fim1 or corporation, todo or c technical specifications and other required docwnents filedby an applicant for a permit shall be reviewed by theAdministrative Authority. Other concerned departments which verifycompliance with other applicable Jaws may review such plans. If theAdministrative Authority finds that the work described in anappHcation for permit and the plans, specifications and otherdocuments filed therewith conform to the requirements of thePlumbing Code and other pertinent laws and ordinances, and uponpayment of the fees specified in Section I 05, a permit shaH thenbe issued to the Applicant.
2
Administration
103 .1.2 When the Administrative Authority issues the permit heshall endorse in writing or stamp the plans and specifications as"APPROVED". Such approved plans and specifications shaH not bechanged, modified or altered without authorization from theAdministrative Authority and aU works shall be done in accordancewith approved plans and specifications. 103 .1.3 The AdministrativeAuthority may issue a Partial Permit for the construction of a partof a large and/or complicated plumbing system before the entireplans and specifications for the whole system have been submittedor approved, provided adequate information and detailed statementshave been filed, complying with all pertinent requirements of thisCode. The holder of such partial permit may proceed at his ovm riskwithout 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 bythe Administrative Authority. Two (2) sets of approved plans,specifications and data shall be returned to the applicant a!ldOwner, one ( 1) set of which shall be kept at the jobsite at alltimes while the work is in progress.
103.3 Validity of Permit - The issuance of a permit or approvalof plans and specifications shall not be construed as a permit toviolate any provision of this Plumbing Code or of any otherapplicable ordinances. The issuance of a permit based on submittedplans. specifications or other documents shall not prevent theAdministrative Authority from thereafter requiring the correctionof errors on said plans, specifications and other documents .andfrom stopping an on-going plumbing installations violative of thisCode or of other pertinent ordinances of this Jurisdiction.
103.4 Expiration- A plumbing permit issued under the provisionsof this Code shall expire and become null and void if the plumbingwork authorized therein is not commenced within one year from thedate of such permit or if the plumbing work so authorized issuspended or abandoned at any time after having been commenced fora period of 120 days . In case of renewal of a plumbing permit, afee equivalent to one-half the amount ofthe original fee shall bepaid.
3
Revised National Plumbing Code of The Philippines
*103 .5 Suspension or Revocation - The Administrative Authoritymay, in Miting, suspend or revoke a permit issued under theprovis:ons of this Code whenever issued in error or on the basis ofincorrect information supplied or in violation of pertinentordinances, rules and regulations. S.tion 104- APPLICATION FOREXISTING PI.lJMBING SYSTEM104.1 Additions, Alterations or Repain -may be made to any existing plumbing system provided the addition,alteration or repair works confonn to requirements for a newplumbing sy~'tem. Additions, alterations or repairs shall notrender an existing system unsafe, unsanitcuy or overloaded. 104.2Changes in Building Occupancy- Plumbing systems which are a part ofany building or structure undergoing a change in use or occupancy,as defined in the National Building Code, shall comply with allrequirements of this Code applicable to the changed use oroccupancy. 104.3 Maintenance - All plumbing systems, materials andappurtenances, both existing and new, and all parts thereof shallbe maintained in proper operating condition. All devices orsafeguards required by this Code shall be maintained in conformancewith the existing Code edition at the time the plumbing system wasinstalled. The owner or his designated agent shall be responsiblefor the maintenance of plumbing systems. To detennine compliancewith this subsection, the Administrative Authority may cause there-inspection of any plumbing system.
104.4 Moved Buildings -- Plumbing systems, which are part ofbuildings or structures in one place and moved into anotherJurisdiction. shall comply with the provisions of this Code for newinstallation.
Sec. 153 NPC 1959
4
Administration
Sfction 105 - INSPECTIONS105.1 General - All plumbing systemsfor which permits are required by this Code shall be inspected bythe Administrative Authority. No portion of any plumbing svstemshall be concealed until inspected and approved. The AdministrativeAuthority or his representative shalt not be liable for expensesincurred in the removal and replacement of materials required towarrant proper inspection. When the installation of a plumbingsystem is complete, an additional and final inspection shall bemade. Plumbing systems regulated by this Code shall not beconnected to the water and energy fuel supplies nor to the sewersystem tAntil authorized by the Administrative Authority and otherAgencies concerned.
AU AQ.01inistrative flumbing Personnel, Plurnbif!&.lnsoectorshaH be a Registeredan4. Licensed Master Plumb~r in accordance withthe provision of Republic Act )378, otherwise, known as "PlumbingLaw. 105 2 Operation of Plumbing Equipment- The requirements ofthis Section do not prohibit the operation or use of any plumbingaccessory installed to replace existing equipment or fixturesserving an occupied portion of the building when a request forinspection of such equipment or fixtures has been filed with theAdministrative Authority not more than 72 hours after suchreplacement work is completed and before any portion of suchplumbing system is concealed by any permanent portion of thebuilding. 105 3 Testing of Systems - All plumbing systems shall betested and approved as required by this Code or the AdministrativeAuthority. 105 4 lnspec.tion Requests - It shaH be the duty of theperson doing the plumbing work authorized by a permit to notify theAdministrative Authority that such work is ready for inspection.The Administrative Authority requires that every request forinspection be filed at least three (3) working days before suchinspection is intended. Such request shall be in writing andjointly signed by the Owner and the Registered and Licensed MasterPlumber- Contractor.It shall be the duty of the person requestinginspections required by this Code to provide access to and meanst{)r proper inspection of such work as well as provide all theequipment. the tools, power and water required tor the test.
J(i5 5 Other lnspe-{tions - ln addition to the inspectionsrequired by this Code, the Administrative Authority may requireothet mspections of the plumbing work to comply with the otherprovisions of this Code, other pertinent laws and ordinancesenforced by the Administrative Authority.
REJVi&ed National Plumbing Code cA The PMippin
l05.6 Rtiospedions105.6.1 A fee will be charged on the Applicantfor each inspection or reinsp~tion when a portion of the plumbingwork for inspection is caJled for is not completed. 105.6.2 Thisprovision shall not be interpreted as requiring re-inspection feesfor the first time a job is rejected for failure to comply with therequirements of this Code, but as deterrent on the practice ofcalling for inspections before the job is ready for inspection orre-inspection. 105.6.3 Re-inspection fees shall be charged when theapproved plans arc not readily available to the Inspector, forfailure to provide access and facility on the date when theinspection is requested, or for deviating fro m plans requiring theapproval of the Administrative Authority. 105.6 .4 To obtainre-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 workwill . be performed.
Section 106- CONNECTION APPROVAL
106.1 Permanent Connections - no person shall install coMectionsto any water supply line, sewer or storm drain systems as requiredby this Code and for which other applications and permits are alsorequired from other Agencies before approval by the AdministrativeAuthority. 106.2 Temporary Coonedions - Administrative Authoritywill endorse to other authorities or government agencies theissuance of temporary connections of the plumbing equipment to thewater supply mai~ sewer main, power line and gas main for thepurpose oftestjng the equipment.
6
Administration
Section 107- SPECIAL PROVISIONS107.1 All Licensed MasterPlumbers registered in accordance with the provisions of RepublicAct No. 1378 shall secure for themselves a seal of the standardsize and type as required. The same shall be used on all plumbingapplications for pemtitlJ and all plumbing plans prepan~d byRegistered and Licensed Master Plumbers as well as on all documentsrequired in the practice of their profession. The seal shall beround in shape and shall be inscribed with the following:
107. 1. I Registered and Licensed Master Plumber at upperportion of the round seal. 107.1 .2 Name of Registered and LicensedMaster Plumber at the upper center. 107.1.3 The registration numbershall 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 REQUIREDEach building shall beprovided with sanitary facilities in accordance with best practicefor mobility of disabled persons as provided in the NationalBuilding Code of the Philippines or by other government departmentshaving jurisdiction.
7
Chapter
2
DEFINITIONSStioo 201 - GENERALFor the purpose of this Code, thefollowing tenns shall bear the meanings indicated in this Chapter.No attempt is made to define ordinary words, used in accordancewith their established dictionary meanings except where a word hasbeen used loosely, that it becomes necessary to define its meaningas adopted in this Code to avoid misunderstanding. Since theprimary purpose is to define tenns in general rather than nouns,th~ definitions are arranged alphabetically according to the firstword of the term rather than the noun.Section 202 "'A"
202.1
ADS - Acrylonitrile-ButadieneStyrene ALLEY - any public space.public park or thoroughfare less than three (3) meters but not lessthan two (2) meters in width dedicated or deeded for publicuse.
-*202.3
ALTER or ALTERATION - any change, addition or modification i.1construction or occupancy.ACCESSmLE - when applied to a fixture,connection, appliance or equipment, shalt mean having accessthereto, but which may require prior removaJ of an access panel,door or similar obstruction. "Readily accessible" shall mean directaccess without the necessity of removing any panel, door or similarobstruction.AIRBREAK_- a physical separation. which may be a lowinlet into the indirect waste receptor from the fixture, applianceor device indirectly connected.
202.4
202.5
*
Sec. I NPC 19598
Revised National Plumbing Code of The Philippines
202 6
AIR GAP, DRAINAGE - the unobstructed vertical distance throughthe free atmosphere between the lowest opening fiom any pipe,plumbing fixture, appliance or apputtenance conveying waste to thetlood level rim ofthe rcc~ptor. AIR GAP, WATER DISTRmUTION- anunobstructed vertical distance through the free atmosphere betweenthe lowest opening from any pipe or faucet conveying potable waterto the tlood-level rim of any tank, vat or fixture. APPROVED -accepted or acceptable under an applicable specifications orstandard stated or cited in this Code., or accepted as suitable forany proposed use under procedures and powers of the AdministrativeAuthority.
202.7
202 9
APPROVED TESTING AGENCY - an organization primarily establishedt()r purposes of testing to approve standards and approved by theAdministrati ve Autlwrity. AUTHORITY, ADMINISTRATIVE - TheAdministrative Authority including the Building Ofiicial, theCommission, the Board and such other drpartment or agencyestablished and authorized to administer and enforce the provisionsof Republic Act 13 78 - The Plumbing Code of the Philippines,Presidential Decree No. 223~ as amended by P.D. 657 creating theProfesskmal Regulation Commission and prescribing its powers andfunctions, and Letter of Instruction No. 1000 - ordering anddirecting the Professiona\ Regulation Commission (PRC), the formerMinistry of Human Settlements, the Departments of Foreign Affairs,Education and Culture, Public Works and Highways, Tourism,Transportation and Communication all SOOT agencies concerned, toauthorize and support PRC Accredited Bonafide ProfessionalOrganizations only, and their members to organize, host, sponsor orrcprc~ent the Filipino Professionals in national, regional andinternational fora, conventions where the concerned professions arcinvolved; and further orders and directs that all governmentagencies and instrumentalities shall g.iv\.~ priority to bonafidemembers of the accredited prnfts~;i\Hlal organizations in the hi1in!l of its employees and engagement of prot~ssional services.
202. IO
Sec. 3 NPC IY5Yu Sec. -1 .Vl'C 1959
Definitions
Section 203 UB''
203.1
BACKFLOW- the flow of water or other liquids, mixtures orsubstances into the distributing pipes of a potable wpply of waterfrom any source other than from its intended source. BACKFLOWCONNECTION - condition or any arrangement whereby reverse flow canoccur. BACKPRESSURE BACKFLOW - occurs due to an increased reversepressure above the supply pressure. This may be due to pumps,boilers, gravity or other sources of pressure. BACKFI.,OW PREVENTER- device or means to prevent flow of liquid from retuming to thesource of supply. Also called vacuum breaker. BACK-SiPHONAGE - theflowing back of used, contaminated or polluted water from aplumbing fixture or vessel into a water supply pipe due to anegative pressure in such pipe. See backflow. BACKWATER VALVE - adevice installed iri a drainage system to prevent reverse flow .BACKVENT PIPE - the part of a vent line, which connects directlywith an individual trap underneath or behind the fixture andextends to the branch or main vent pipe at any point higher thanthe fixture or fixture traps it serves. This is sometimes called anindividual vent. See Revent pipe. BALL co*ck - a valve opened andclosed by the fall and rise, respective!y, of an attached ballfloating on the surface of the liquid. BALI, JOINT- a type of pipeconnection in which a ball-shaped end is held in a cuplike shelland allows movements in every direction. BATHROOM- a room equippedwith a shower stall or bathtub. BAITERY OF FIXTURES - any of two ormore similar adjacent t! xtures which discharge into a commonhorizontal soil or waste branch. BELL OR HUB - that portion of apipe which, for a short distance, is suffi ciently enlarged tort.~ceive the end of another pipe of the same diameter for thepurpose of making rt caulked or push-on joi nt Sec. 5 NPC 1959 **Sec. 6 NPC 1959 *** Sec. 7 NPC /959
203.2 203 .3
203.4 ... 203.5
203.6
** 203.7
..... 203.8
,..,.
....
203 .9203.10
203.11
....."***
203.12
**** Sec. 8 NPC 1959 ... ,... Sec. 9 NPC 1959 ****** Sec. 10 NPC1959 **** 5'e:. 1 I NPC 1959 ******** S~c. 12 NPC 1959
**
I(\
Revised National Plumbing Code of the Philippines
203.13 203.14 203.15
BENDING PIN (or IRON)- a tool for straightening or bending leadpipe. BIBB- synonymous with faucet, co*ck, tap, plug, etc. The word"faucet" is preferred. BIDET - A plumbing fixtures used for washingthe middle private part of the body, especially the genitals. Alsocalled a "sitz" bath. BLANK H.,ANGE- A pipe tlange that is notdrilled for bolt holes. BLIND FLANGE- a flange that closes the endof a pipe. There is no opening for the passage of liquid or gas.BLOWOFF detritus.
u
203.16 203.17 203.18 203.19 203.20
a
controHed outlet of a pipeline to discharge liquid or
BOARO - the Licensure Board for Master Plumbers
BOILER BLOW-OFF- a valved outlet of a boiler that permitsdischargeof accumulated sediment.
203.21 BRANCH -- any part of the piping system other than amain, riser or stack. BRANCH INTERVAL- a length of soil or wastestack corresponding in general to a story height, but in no caseless than 2.43 meters within which the horizontal branches from onefloor or story of a building are connected to the stack BRANCH,FIXTURE- see Fixture Branch BRANCH, HORIZONTAL- see HorizontalBranch
.... 203.22
203.23 203.24
203.25 BRANCH VENT- a hmizontal vent connecting one or moreindividual vertical back vents with the vent stack or stack vent.203.26 BRAZED JOINT - any joint obtained by joining of metal partswith alloys which melt at temperatures higher than 449 degreescentigrade, but lower than t.he melting temperature of the parts tobe joined.
* Sec. I 3 NPC IV59 ** ~fi(!c. J.l NJ>C !959*** Sec. 15 NPC1959 **** Sec. 16 NPC 1959 ***** Sec. 17 NPC lC 1959 ****Sec. 25NPC 1959
Revised National Plumbing Code of the Philippines
* 204.5
CESSPOOL - a non-watertight lined excavation in .thl! groundwhich receives the discharge of a sanitttry drainage system or partthereof, d~signed to retain the organic matter and solidsdischarging thcretrom, 0ut permitting the li4uid to seep throughthe bottom and sides of the cesspool.
204.6 204.7
CHASE- a vertical shaft for installarion of different pipestacks.CHECK VAl.VE- a valve that automatically closes to preventthe flow of liquid or gas in a reverse direction
... 2048
CIRCUIT VENT - a group vent pipe which starts in front of theextremefixture connection on a h01izontal branch and connects tothe vent stack. Sec loop' vent, also .
204.9 204.10
CLARIFIER- Sec Interceptor.CODF. -The word ''Code" or "thisCode," when U5ed alone, shall mean these regulations, subsequentamendments thereto or any emergency rule or regulation which theAdministrative Authority having jurisdiction may lawfully adopt .COMMON VENT- sec unit vent and dual vent. COMBINATION WASTE ANDVENT SYSTEM - a specially designed system of waste piping embodyingthe horizontal wet venting of one or more sinks or floor drains bymeans of a common horizontal waste and vent pipe. adequately sizedto provide free movement of air above the flow line of the drain.COMBUSTIBLE CONSTRUCTION - a structure which any part of it!>stmctural framework will ignite and burn at a temperature of 756degrees centigrade or less.
204.11
204.12
204.13
204.14 204.15204.16
COMMISSION -The Professional Regulation Commission (PRC). COMMON- that part of a plumbing system designed and installed toservemore than one ( 1) appliance, fixture, building or system.
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 allfuelbmning applianc~s installed in that space*Sec. 29 NJ'('195Y
** s(!(:. Jo Nrc 1959 St'C.
**** Stc.
31 NJ'(' JI)5Y 32 NPC /959
1.1
Definitions
204.17
CONTAMINATION - an impairment of the quality of the potablewater which creates an actual hazard to the public health throughpoisoning or spread of disease by sewage, industrial fluids orwaste. Also, defined as High Hazard. CONTINUOUS VENT - a continuousvent is vertical vent that is a continuation of the drain to whichthe vent connects. CONTINUOUS WASTE - a drain connecting thecompartments of a set of fixtures to a trap or connecting otherpermitted fixtures to a common trap. CONDUCfOR OR DOWNSPOUT- avertical pipe to convey rainwater.
.. 204.18
204.19
.. 204.20
.... 204.21
CORPORATION co*ck - a stop valve placed at the connection of thewater service pipe to the water main.COURT- an open, unoccupiedspace, bounded on two (2) or more sides by the walls of thebuilding. An inner court is a court entirely within the exteriorwalls of a building. All other courts are outer courts.
204.22
*"'
204.23
.. 204.24
CRITICAL LEVEL- C-L or C/L marking on a backflow preventiondevice or vacuum breaker is a point conforming to approvedstandards (;:fld established by the testing laboratory (usuallystamped on the device by the manufacturer) which determines theminimum elevation above the flood level rim of the fixture orrcceptable served where the device may be installed. When abackflow prevention device does not bear a critical level marking,the bottom of the vacuum breaker, combination valve or the bottomof any such approved device shaH constitute the criticallevel.CROSS-CONNECfiON- any connection or arrangement, physicalorotherwise, between a potable water supply system and anyplumbing
fixture or any tank. receptable, equipment or device, throughwhichenables non-potable, used, unclean, polluted, contaminatedwater or other substances to enter into any part of such potablewater system under any condition.
*Sec. **Sec. ... Sec. u Sec. Sec.
33 NPC 1959 34 NPC' /95( ' lC 1959... Sec. 92 NPC 1959
23
217.2
PB - Polybutylene. Tube made of plastic material and coloredblack. The cross-sectional shape is nonnally oval and is denoted byits outside diameter or 0.0. Nom1ally used as water serviceconnection from main to meter. PE - Polyethylene. Tube made ofplastic material and colored black. The cross-sectional shape iscir~lar and is denoted by its outside diameter orO.D.
217.3
217.4
PIPE - a cylindrical conduit or conductor conforming to theparticular dimensions commonly known as ..pipe size, and is denotedby its interior diameter or l.D.PITCH - see Grade.
217.5 217.6
PLUMBING- the Nt and t~hnique of installing pipes, fixtures andother apparatuses in buildings for bringing in the supply, liquids,substances and/or ingredients and removing them~ and such water,liquid and other carriedwastes hazardous to health, sanitation,life) property~ also the pipes and fixtures after installationi.e., the plumbing system.
217.7
PLUMBING APPLIANCE - any one of a special class of device orequipment intended to perform a speciaf plumbing function. Itsoperation and/or control may be dependent upon one or more energ~components, such as motors, controls, heating elements andpressure-temperature-sensing elements. Such device or equipment mayoperate automatically through one or more of the following actions:a time cycle, a temperature range, a pressure range, a measutedvolume or weight~ or the device or equipment may be manuallyadjusted or controlled by the user or operator.PLUMBINGAPPURTENANCE - a manufactured device or a prefabricated assembly oran on-the-job assembly of component parts, and serves as adjunct tothe basic piping sy~tem and plumbing fixtures. An appurtenancedemands no additional water supply nor does it add any dischargeload to a fixture or the drainage system. It performs some usefulfunctions in the operation, maintenance, servicing, eccnomy orSclfety of the plumbing system.
217.8
217.9
PLUMBING FIRM- a sole proprietorship or corporation composed ofRegistered and Licen:)ed Master Plumbers together with alliedprofessionals, wi.th the Master Plumbers composing the majority ofthe members~ip, incorporators, directors and/or executive officersand Licensed Master Plumber only render work and services withinthe cognizance of a Registered Master PJumber and members of theallied professions also only render work and services within thecognizance of their respective professions. Sec. 93 Nrc 1959u
Sec. 94 NPC 1959
Revised National Plumbin~J Code r:A the Philippines
217.10
PLU MBJNG Fl.XTURF.S - are approved-type installed receptacles.devices or appliances supplied with water or receive liquid orliquid-borne wastes and discharge such wastes into the drainagesystem to which they may be directly or indirectly connected.Jndustrial or commercial tanks, vats and similar processingequipment are not plumbing fixtures, but may be connected to ordischarged into approved traps or plumbing fixtures as provided forjn this Code. PLUMBING OFFICIAL - the Administrative Authority orthe officer charged with the administration and enforcement of theNational Plumbing Code, or his regularly authorized deputy.PLUMBING SYSTEM - includes all potable water supply anddistribution pipes, ali plumbing fix.tures and traps; all sanitaryand storm drainage systems~ vent pipes, roof drains, leaders anddownspouts; and all building drains and sewers, including theirrespective joints and connections; devices, receptacles, andappurtenances within the property~ water lines in the premises:potable, tap, hot and chilled watt!r pipings~ potable watertreating or using equipment; fuel gas piping; water heaters andvents for same. PLUMBING UNIT - a minimum standard quantityofplumbing fixtures that discharge wastes into a plumbinginstallation induding: one (I) water meter, one (I) water closet,one (I) lavatory, one ( l) shower head and drain tor a bathtub orshower stall, one ( 1) kitchen sink, one ( 1) Iau ndry tray andthree ( 3) t1oor drains ~n,d ~ou~ (4) faucets/hose bibb. POLLUTION-an impairment of the quality of the water to a degree which createshazard to the public health and adversely affects the aesthetic andpotable qual it irs of waters for domestic usc . POTABLE WATER --water satisfactory for drinking, culinary ar.d domestic purposesand meets the requirements of the Philippine National Standards forDrinking Water. PRESSURE- the normal force exerted by a hom*ogeneousliquid or gas, per unit of area on the wall of the container STATICPRI!:SSlJRE -- the pressure existing without any flow motion.
217.11
211.12
217.13
217. 14
... 217.15
217.l6
217.16. 1
*Sec. 95 NPC 1959 .. Sec. 97 NPC /959 ***Sec 96 NPC 1959****Sec. 98 NPC {959
25
Definition&
217. 16.2
RESlDlJAL PRESSURE -- the pressure available at the fixture orwater outlet; allowance is made for pressure drop due to frictionloss, head, meter and other losses in the system during maximumdemand period.
217.17 ** 217. 18
PRIMARY BRANCH -- of the building drain is the single slopingdrain from the base of a stack to its junction with the mainbuilding drain. PRIVATE OR PRIVATE USE- In classification ofplumbing fixtures, "private" applies to plumbing fixtures inresidences and apartments, to private bathrooms in hotels andhospital s, to rest rooms in commercial establishments forrestricted use, single fixture or group of single fi xtures and tosimilar installations where the fixtures are intended for the uscof a fam ily or an individual. PRJVATE SEWAGE DISPOSAL SYSTEM - aseptic tank with theeffluent discharging into a subsurface disposalfield, into one or more seepage pits or into a combination ofsubsurface disposal field and seepage pit or of such otherfacilities as may be permitted under the procedures set forthelsewhere in this Code.
217. 19
*** 217.20
PRIVATE s:WER - a building sewer, which receives the dischargefrom more than one building drain and conveys it to a public sewer,private sewage disposal system, or other points of disposaL PRIVY -an outhouse or structure used for the deposition of excrement.PRIVY VAULT- a pit beneath a privy where excrement collects.
217.21
.. 217.22
217.23
.... 217.24 217.25
PUBLIC OR PUBLIC USJec. J/8 NPC 1959 &c. 119 NPC 1959,)'ec.
Sec. ll 7 NPC 1959
120 NPC 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 forcombining the flow from two or more Jines of hose into a singlestream. The inlet fitting of a fire standpipe located above groundlevel. SIPHONAGE a suction created by the t1ow of liquids m p1pes.pressure less than atmospheric. SHALL - the word "shall" denotesmandatory acceptation. SHIELDED COUPLING- an approved clastomericsealing gasket with an approved outer shield and a tighteningmechanism. SL"iGLE FAMILY D\\'ELLJNG- a building designed as a homeby the owner of such building, and shalJ be the only dwellinglocated on a parcel of ground with the usual accessorybuilding.SIZE AND TYPE Oil~ TUBING - see Diameter.
220.14 ... 220. IS 220.16 220.17
A
220.18 220.19
SLIP JOINT - an adjustable tubing connection, consisting of acompression nut, a friction ring, and a compression washer.designed to fit a threaded adapter fitting or a standard taper pipethread. SLOPE - see Grade. SOIL STACK PIPE - a vertical soil pipeconveying fecal matter and wastewater.
220.20
.. 220.21
.
220.22
SOIL PIPE - any pipe, which conveys the discharge of watercloset, urina! or fixtures having similar functions, with orwithout the discharges from other fixtures to the building drain orbuilding sewer.SOLDERED JOINT - a pipe joint obtained by joiningmetal parts with metallic mixtures or alloys which melt at atemperature below 427 degrees centigrade and above 149 degreescentigrade .
%20.23
.,.!LO 24=t).25
SPIGOT - the end of a pipe which fits into a bell. Also a wordused synonymousl y with faucet.SPECIAL WASTES - wastes whichrequire some special methods of handling such as thJiows: 315. 1. 1Cast Iron SoiJ Pipe - Bell & Spigot and Hubless p1pe shall besupported at every storey or clo~er. 315.1.2 Snewed Pi1)e - IronPipe Size (IPS) shall be supported at not less than every otherstorey height ../3 15 . I 3 Copper Tubing - shall be ~up ported ateach storey or at max1mum intervals of J nwters on center.
J 15 .1.4 Lead Pipf ... shall be supported at intervals notexc.eeding 1.20 meters at centers with a rigid vertical back-up )15 . I. S Plastic Pipe shall be supported at every one- ( 1) meterinterval.
1152 Horizontal PipingJ 15.2.1 Supports hori zontal pipes shallbe supported at sufliciently close intervals to keep them inalignment and prevent sagging. 315.2.2 Cast Iron Soil Pipe- Wherejoints occur, suspended cast iron soil pipe shall be supported atnot more than 1. 5 meters intervals; except that pipe exceeding I.S meters length, may be supported at not more than J metersintervals. Supp011s shall be adequate to maintain alignment and toprevent sagging and shall be placed within 0.45 meters of the hubor joiat. Hubless or compression gasket joints must be supported atleast at every other joint except that when the developed lengthbetween supports exceeds 1.2 meters, they shall be provided at
each joint Support shall also be provided at each horizontulbranch 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 inother Sections of this Code, shall be supported at approximately3.0 meters intervals for piping 19 .mm diam.eter and smaller and3.6 meters intervals for piping 25 mm and larger in diameter.315.2.4 Copper Tubing - shall be supported at approximately 1.8t:-t~~ :-: :..: 11 intervals for piping 38 mm diameter and smallerand 3.0 meters in!-::rvc'.n for pipings 51 mm and larger indiameter. 315.2.5 uad Pipe - shall be supported by stiff metal orwooden backing for its entire length with hangers properly spaced.315.2.6 In Ground - piping buried in the ground shall be laid on aflTYll bed for its entire length, except where concrete cradlesupport is provided, which is adequate and approved by theAdministrative Authority. 315. 2.7 Plastic Tube - sh~l be supportedby stiff metal or wood backing with hangers in its entire lengthfor small-size tubings up to 38 mm diameter and without backingsbut with spaced metal hangers at approved spacing for larger-sizetubings.
315.3 Hangers and Anchon3 I 5.3 .I
Materials - for hangers and anchors shall be of sufficientstrength to maintain their proportional share with the weight ofthe pipe andits content.
3 I 5.3.2
All pipings, fixtures and equipment shall be adequately anchoredor supported to the satisfaction of the AdministrativeAuthority.
Section 316 - TRENCHING, EXCAVATION AND BACKFILL 3 l 6.1
Tunneling and driving may be done in yard, court or driveway ofanybuilding site. Where there is suffici ent depth, tunneling maybe used between open cut trench~s. Tunnels shall have a clearheight of 0.6 meter above the pipe and hall be limited in le ngthto one-half (1/2) the :iepth of the trench, wd. a maximum length of2.4 meters. When pi pe is driven, the drive pi. l shall be at leastone 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 theinstallation of a building drainage system or any part thereof,within the walls of a building, shall be open trench work and keptopen until the piping has been inspected, tcs!ed and accepted. Allexcavations shaH he completely back-tilled as soon as possibleafter inspection. Adequate precaution shall be taken to ensureproper compactness of backfill around pipes without damage to suchpipe Trenches shall be back-filled in thin layers of0.3 meter abovethe top of the pipe with clean earth which shall not containstones, boulders, cinders ~ other mate.rials which can damage orbreak the pipes or cause con:osfve action. Mechanical devices orequipment such as bulldozer, grader, etc., may then be used tocomplete the back-filhng to grade. The filling shall be properlycompacted Suitable precautions shall be taken to ensure permanentstability for pipes la.id in filled or made ground.
316 3
Chapter
4
PLUMBING FIX1,URES Section 401 - MATERIALS- GENERALREQUIREMENTS
Quality of Fixture8 - plumbing fixtures shall be manufactured ofdense, durable, non-absorbent materials an.d must have smoot~impervious surfaces, free from unnecessary concealed foulingsurfaces. Except as permitted elsewhere in this Code. all fixturesshall conform in quality aad design to nationally recognizedapplicable standards or to other approved standards acceptable tothe Administrative Authority. All porcelain enamel swfaces onplumbi.ng fixtures shall be acid resistant (for the convenience ofusers of this Code, a list of generally accepted Plumbing Fixturesis included in Table 14-4 Plumbing Material Referenced Standards.)Water doset bowls fur public use shall be the elongated bowl typesequipped with open-front seats. Water closet seats shall be ofsmooth nonabsorbent material and properly sized for the watercloset bowl used.Section 402 - MATERIALS- ALTERNATIVES
Special-use fixtures may be made of soapstone) chemicalstoneware or may be lined with lead, copper base alloy,nickel-copper alloy, corrosion-resisting steel or other materialsspecially suited for the use which the fixture is intended.Restaurant kitchen and other special-use sinks may be made ofapproved-type bonderized and galvanized sheet steel of not lessthan Gauge No. 16 U.S. B&S or 1.6 mm thick. All sheet metalplumbing fixtures shall be adequately designed, constructed andbraced in an approved manner to satisfactorily accomplish th~intended purposes. Section 403 - OVERFLOWS
When any fixture is provided with an overflow outlet, .the wasteshall be so arranged that the standing water inside the fixturecannot rise inside the overflow way when the stopper is closed norremain inside the overflow way when the fixture is empty. Theoverflow pipe from a fixture shall be connected to the house orinlet side of the fixture trap. Water Closet or Urinal flush tanksshall discharge into the bowls or wares served by them, but itshall be unlawful to connect such overflows with any other part ofthe 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 -allplumbing fixtures other than water closets and siphon actionwashdown or blowout urinals, shall be equipped with approvedstrainers having an approved w?Jerway area. The strainers servingshower drains shall have waterway equivalent to the area of thetailpiece~ (meaning, the sum of all the areas of the perforationsof the strainer is equivalent to the outlet area) .
4:J4.2
Connections - Fixtures having concealed slip joint connectionsshall beprovided with an access panel or utility at least 0.3 meterin its least dimension and arranged so that the r
apartment wli l
lJCPIITUlli."'II ~tal Waiting
I per dwelling I per dwelling or epartmc:nt unit
! perrwm0: 1-9 I : 10-50
I pc:r7517'
L;Jool5
ibpital for . ,Ioyecuse
Male Female14 1: t-15 l : 1-15 2: 16-35 2: 16-35 3 36-55 3 36-55Over 5~. 11_ ~~lcs
2:201-400 3 40 1-750
2: 201-400 3: 401-750 Over 750, add l f;xtuJr e-a~h aJdilionai~0 persons
I Jlc:ryi
~!s-for
Male
-------- r-----t em ale
Male
I
t
)e!r.entar)'
1: 1-20 1: l-20 2 21-)0 2: 2-l-50 Over 50, udd 1 lhltuc forc;;~h uddttinMl 50I't.1.S()!I
Fl1Il8.!e I: 1-25 2:2650 2: 26-50 Ovct 50, utld I fixturefor
-
I pa75 12
1: I-ISO
01ch &ddit;onal 50
sh:mal..:
l per 75
pCl ::Klll!\
lper7S12!" (2) luw1 dry tray:; or two automati.; washerstandpipes, or t:ombin::tion thCI'eOf, for each ten (10)apartments. Kitchen sinks. one ( 1) I"Or cal~h dwelling or apurtmmtWlit. As rt.:quin:d by ANSllA. l, Sanil.tltion in Places ()fEmplo}n1e11t. Wllere there is exposure to skin contamination v.-ithpoisonous, infectiou~, or irritating materials, provide one (l)Javatoty for each five- (5) persons. W~tk 6{)9 6 nun or "'ac;h sink457.2-mm diameter a cif(:ular be.sin, when provided \\ith wateroutlets 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 backflowprotection shall be in accordance with the Table 6-1 .
603.2.2 Atmospheric Vacuum Breaker (AVB) - consists of a body, achecking member and an atmospheric opening.
603.2.3 Double Check Valve Backflow Prevention Assembly (DC)consists of two independently acting internally or externallyloaded check valves, four properly located test co*cks withcormectors and two isolation gate valves.
603.2.4 Pressure Vacuum Breaker Backflow Prevention As!embly(PVB)- consists of a loaded air inlet valve, an internallyloadt1ona1Plumbio Code of the Philippines
tlh 8
Size of Branrhes. The number of fixture units handled by abranch shal ldetem1ine the size of tbat branch, fol lowing themethods outlined in
subs...-ction 609.7 of this section."-~ 9
SiLing for Flushoml."'ael' Valves. Bratlches and snains servingwater dosets or s\m ilar tlushometer valves may be ~ 1 zed fromTable 6-6 when the values in Table 6-4 are assigned to ca1.:htlushomcter valve beginning with the most remot e valve in ea ~.:hhmnch. Any sy s~':m using f1ushometer valves may be sized also bythe procedures set fo11h in Appendix A (Recommended rules forsizing the water supply system). Piping supplying a flushomctervalve ~hall not be less in size than the valv l! inlet.
TABlE 6-4Flushometcr Fixture Units for Water Sizing UsingTableA
1 :~re Cat~or~e~
Number of
Flushomcter Valvesl 2
Fixture Units Assignt d f0r Water Clm;e.ts and SimilarFixtures
___ Fixtures Units Assigned for Urinals and Similar Fixtures
----
l . .. . . . ~ ....
40 7090 105115 plus I 0 tor each additional fixture lfl excessof5
20 3545
1~
34
~~~
5358 plus 5 for each additional fixture II\excess of 5
5 or more
I
!{19.10
Sizing Systems for Flushomrter Tanks. The size of branches andmains ~erving flu shomcter tanks shaH be consistent with the sizingprocedures for
tlush tank water closets.(.09 ll
Sizing syst142
16 i6 30
')
''" J
3703iti(,~0
318 368--
!2'12:\--
:>5 1 :tl67 170 205[jl)
3~
}IJ
102
949~
]()
~!
370
!51 340 370
lW 3 !8500
ll
.1 8 51 51
04610535
654 [
I!.
370 580
-+70 '
400
5_ L.._ } l5 . 1f>1.. L.._3,_
2S5
W2 '267
2) 0
I psi = 6.895 Kpa
75
TABLE 6-6.3
PRESSl JRE RANGE- Over 413 KPa O;er 60 psi) Meter Building
Item
and Maximum Allowable Length in Feet (meters)RAINAGESYSTEl\t1Section 701- MATERIAl.S701.1
Excreta Drainage pipings shall be cast iron, ductile iron,galvanized stee~ galvanized wrought iron, lead, copper, brass,Series 1000 PVC DWV. extra-strength vitrified clay pipe or otherapproved materials having smooth and uniform bore except that: Nogalvanized wrought iron or galvanized steel pipe shaH be usedunderground and shall be kept at least 152 mrn above ground. ABSand PVC DWV piping installations shall be used in higlHisebuildings, provided that its use shall be the discretion of theMaster Plumber/Designer and also with the full consent of theowner. No vitrified clay pipes or fittings for building drain orsewer shdl be used above ground or whenever piping is pressurizedby a pump or ejector. They shall be kept at least 0.3 meter belowfinish ground level. Drainage fittings shall be of cast iron,malleable iron, lead, brass, copper, ABS, PVC, vitrified clay, orother approved materials having a smooth interior waterway of thesame diameter as the piping served and all such fittings shall becompatible with the type of pipe used. Fittings on screwed pipejoints shall be of the recessed drainage type. Burred ends shall bereamed to the full bore of the pipe. The threads of drainagefittings shall be tapped to allow two (2) percent or 21 m.m/mgrade.
701.1.1 701.1.2
701.1.3
701.2
70 1.2.) 701.2.2
Stion 702- FIXTURE UNIT EQUIVALENT702.1
The Fixture lJnit (F.lJ.) rating of plumbing fixtures shown onTable 7-2 shall be based on the size of the trap required, and thefixture Unit equivalent of fixtures and devices not shown in Table7-2 shall be based on the rated discharge capacity in liters persecond in accordance with the Table 7-3
Maximum trap loadings for sizes up to 102 mm arc as follows:
* Sc?c.
2-IJ
2-13 2-l.f 2.f5 NIY' 1959
78
Revi!>ad N. nd of such shape and capacity to preventsplashing or flooding and shall be located where readily accessiblefor inspection and cleaning. No standpipe receptOr for anyclotheswasher shaH extend more than 0.8 meter nor less than 0.45 mabove its trap. No trap for any clotheswasher standpipe receptorshall be installed below the floor, but shaH be roughed no lessthan 15 em and. not more than 45 em above the flo or. No indirectwaste receptor shall be installed in any toilet room, closet,cupboard or storeroom nor in any other portioil of tcs, or otherdischarges under pressure shall be directly connected to any partofthe drai11age system. The foregoing shall not apply to anyapproved sump pump or to any approved pressure-wasting plumbingfixture or device when the Administrative Authority has satisfiedhimself that the drainage system i~ ad'O!quately sized toaccommodate the anticipated discharge thereof
Section 806 - STERll,J: EQU IPl\tENTAppliances, devices orapparatus such as stills, sterilizers and similar equipmentrequiring water and waste and used for sterile material~ shall bedrained through an a!rgap.
Section 807- APPLIANCES807.1 Appliances, devices, equipment orother apparatus not regularly classified a3 plumbing fixturesequipped with pumps, drips or drainage outlets may be drained byindirect waste pipes discharging into an approved-type opeD.receptor. When the cond~nsate waste from air conditioning coils isdischarged b; direct connection to a lavatory tailpiece or to anapproved accessible inlet 0; a bathtub overflow, the cormectionshali be located in the area controlled h the same personcontrolling the air conditioned space. '
807.2
807.3
When undiluted condensate waste from a thcl buming condensingapplianc~ is discharged into the drainage system ~he material inthe dra!nag.e syste;:; shall be rast iron, galvanized iron, plasticor 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 fixturetailpiece and trap. s11ch tailpiece and trap may be brass. Anymaterials approved in Section 701 may be used when, in the opinionof the Administrative Authority, condensate waste from a fuelburning condensing appliance is diluted either before or afterdischarge into the drainage .\)'Stem.No domestic dishwashingmachine shall be directly connected to a drainage system of foodwaste disposer without the use of an approved dishwasher airgapfitting on the discharge side of the dishwt.shing machine. Listedairgaps shall be installed with the flood level (FL) marking at orabove the flood level of the sink or drainboard, whichever ishigher.
807.3 .2
807.4
Stdion 808 - COOLING \VATERWhen permitted by the Departmenthaving jurisdiction, clean running water used exclusively as acooling medium in an appliance, device or apparatus, may dischargeinto the drainage system through the inlet side of a fixture trapin the event that a suitable fixture is not. available to receivesuch discharge. Sud1 trap connection shall be by means of a pipeconnected to the inlet side of an approved fixture trap, the upperend terminating in a funnel shaped receptacle set adjacent, a.TJdnot less than !52 mm above the overflow rim of the fu ture.
Section 809- DRINKING FOUNTAINSDrinking fountains may beinstalled with indirect wastes.
93
Section 810- STEAM AND HOT WATER I)R-\INAGE CONDENSERS ANDSU1\1PS 810.1
No steam pipe shall be directly connected to any part of aplumbing or drainage system, nor shall any water having atemperature above 60C bedischarged under pressure directly into anypart of a drainage system. Pipes from boilers shall discharge bymeans of indirect waste piping as detennined by AdministrativeAuthority or the boiler manufacturer's recommenda.tions. Such pipesmay be indirectly connected by discharging into an open or closedcondenser or intercepting sump of approved type that will preventthe entrance of steam or such water under pressure into thedrainage system. All closed condensers or sumps shall be providedwith a vent taken off from the top and extended separately, fullsize above the roof. All condensers and sumps shall be properlytrapped at the outlet with a deep seal trap extending to within 152mm of the bottom of the tank . The top of the deep seal trap shallhave a 19 rnm diameter opening located at the highest point of thetrap to serve as a siphon breaker. Outlets shall be tr.ken off fromthe side in a manner to allow a water line to be mai ntained thatpermanently occupies not less than one-half( 'l2) the capacity ofthe condenser or sump AJI inlets shall enter above the water line.Wearing plates or baftles shall be installed in the tank to protectthe shell. The sizes of the blowoff line inlets, the water outletsand the vent shall be as shown in Table 8-l. The contents ofcondensers 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 concreteshall have walls and bottom not less than 102 mm thickness, and theinside 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 condensersshall be protected from exten:al corrosion by an approvedbituminous coating. Sumps and condensers shan be provided withsuitable means of access for cleaning and shall contain a volume ofnot less than twice the volume of water removed from the boiler orboilers connected thereto when the normal water level of suchboiler or boilers is reduced not less than 102 mm .
810.3
94
Re\ti5ed Nationel Plumbing Code of the Philippines
TABLES..l PIPE CONNECTIONS lN BLOWOFF CONDENSERS AND SUMPSNo.1
2 34
5 6
Boiler Blowoff, mm 19 25.4 32 38 51 64
Water Outlet, mm19
25.4
32 3851
Size of Vent, mm 51 64 76
64
102 127 I 52
*
To he used only with hoi/as of 9.29 m2 ofheatmg surface orless.
Srction 811- CHEMICAL WASTES811.1 Chemical or industrial liquidwastes likely to damage or increase maintenance costs on theexcreta sewer system, detrimentally affect sewt.ge treatment orcontaminate surface or subsurface waters, shall be pretre:1ted torender them innocuous prior to their discharge into a drainagesystem. Detailed plans and specifications of pretreatmentfacilities shaH be requir~d by the Administrative Authority. Pipingconveying industrial. chemical or process wastes from their pointof origin to sewer-connected pretreatment facilities !iliall be ofsuch material and design to adequately perform its intendedfunction to the satisfaction of the Administrative Authority.Drainage discharge piping from pretreatm~nt facilities orintercep.tors shall conform to standard drainage installationprocedure. 811 .2 Each waste pipe receiving or intended to receivethe discharge of any fixture where acid or coiTosive chemical isplaced and each vent pipe connected thereto, shall be constructedof chemical-resistant glass-lined pipe, high silicon iron pipe,lead pipe not less than 3.2 mm wall thickness, an approved type ofceramic glazed or unglazed vitrified clay or other approvedcorrosion resistant rnaterit:!IS.
95
indirect Waste Piping, Wet-Vented Systems and Special Wastes
811.3 811.4
Ali jointing materials shall be of approved type and quality .Whenever practicable, nH piping shalt be readily accessible andinstalled with the maximum of clearance from other services. Theowner shall make and keep a permanent record of the location of allpipings and venting carrying chemical waste.
811.5
811.6811.7
No chemical vent shall be connected or intersect vents fo rother services.No chemical wastes shall be discharged into theground, local sewer or otherdisposal means without approval of thelocal Administrative Authority.
811.8
The provisions of this Section reiative to materials and methodsof construction, need not apply to minor installations such assmall photographic or x-ray dark rooms or small research or controllaboratories where small amounts uf adequately water-dilutedchemicals are disch.::rged
Section 812- VERTICAL WET VENTING812. 1
\Vet venting is limited to vertical drainage piping receivingthe ctischarg ~
from the trap arm of one (1) and two (2) fixture unit. Fixturesthat a\~o serves as a vent for not to exc~d four (4) fixtures. Allwet-vented fi xtu~cs shall be on the same floor level, providedfurther, that fixtures 'Nith a continuous vent discharge into a wetvent shall be on the same level ;;.s thewet-vented ftxtures.812.2
The vertical piping between any two (2) consecutive inlet levelsshall beconsidered a wet-vented section. Each wet-vented sectionshall be a minimum of one (I) pipe size larger than the requiredminimum waste pipe size of the upper fixture or shall be one (I)pipe size larger than the required minimum pip~ size for the sum ofthe fixture units served by such wet. vented section, whichever islarger, but in no case less than S I mm in diameter.
812.3
Common vent sizing shall be the sum of the fixture units servedbut in no case smaller than the minimum vent pipe size require'jfor rmy fixttre served, or by Section 904.
Section 813 -SPECIAL Vl:NTING FOR ISLAND FIXTURESTraps forisland sinks and similar equipment shall be roughed~in above thefloor and may be vented by extending the vent as high as possible,but not less than the drainboard height and then returning itdownward and connecting it to the horizontal sink drain immediatelydownstream from the vertical fixture drain. The retumed vent shallbe connected to the horizontal drain through a wye-branch fittingand shall, in addition, be provided with a foot vent taken oft' thevertical fixture vent by means of a wye--branch immediately belowthe floor and thence extending the vent line to the nearestpartition and then through the roof to the open air or may beconnected to other veats at a point not less than 152 mm above theflood level rim of the fixtures served. Drainage fittings shall beused on all parts of the vent below the floor level and such a ventline shall have a minimum slope of 2 percent or 21 mrnlm backtoward the drain where it is connected shall be maintained. Theretum bend used under the drainboard shall be a one ( 1) piecefitting or an assembly of a forty-five (45) degree elbows. Pipesizing shall be as elsewhere required in this Code. The island sinkdrain. upstream of the returned vent, shall serve no otherfixtures. Ac..1 ,C>()Qi6 75
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Chapter
13
JOINTS AND CONNECTIONS Section 1301 - TIGHTNESS Pressure test onjoints and cormections of pipes and fittings in the plumbing systemshall be required to ensure ga!>tight and watertightconnections. Section 1302 !302.1TYPF~S
OF JOINTS
Caulked Joints - for bell-and-spigot cast iron soil pipe (CISP)and other similar joints shall be firmly packed with oakum or hempand filled with molten pig lead to a depth of not less than 25.4mm. The lead shall be caulked thoroughly at the inside and outsideedges of the joint. After caulking, the finished joint shall notextend more than 3.2 mm below the rim of the hub. No paitit,varnish or other coatings shall be permitted on the jointingmaterial until after the joint has been tested and approved.Caulked joints in centrifugally cast iron (CClP) belt-and-spigotwater pipe shall be made with non-toxic materials.
1302.2
Threadt>d Joints - for iron pipe size (IPS) pipe and fittingsshall be standard taper pipe threads. Threads on plastic pipe shallbe f2 .ctory cut or molded. Threaded plastic pipe shall be Schedule80 minimum wall thickness. Tubing threads shall conform to finetubing thread standards. When a pipe joint material is used, itshall be applied only on the male threads and such materials shallbe approved type, insoluble in water and nontoxic. Cleanout plugsand caps shall be lubricated with water-insoluble, non-hardeningmateriaL Tape is acceptable for use on male threads, onty ifscrewed pjpe joint. \Viped Joints - Joints in lead pipe or fittingsor between lead pipe ( lr fittings and brass cr copper pipe,fernlles, solder nipples or traps shall be fuli-wipcd lead joints.Wiped lead joints shall have an exposed surface on ea~~h side of ajoint not less than 19 nun and at least as thick as the rrr.~!erialbeing joined. Wall or floor flange lead-wiped joints shall be madet:; _;sir.g a lead ring or flange placed behind the joint at wallor floor . .loints b ..:~v, ~cn lead pipe and cast iron, steel orwrought iron pipe shall be made by me::.r.~ of a caulking ferruleor sold~ring nipple.
13023
Sec. 168 NPC 1959 Sec. 170 173 NPC 1959
137
Revised National Plumbing Code of the Phlllppines
1302.4
Solder and Sweat Joints Joints in copper tubing shall be made bythe appropriate use of approved brass or coprer fittings. Surfacesto be joined by soldering shall be cleaned bright by manual ormechanical means. The jnints shall be properly fluxed with anapproved noncDrrosive type flux and made up with approved solder.All solder and fluxes shall be manufactured to approved standards.Solders ano fluxes with a le~.d content which exceeds 0.002 areprohibited in piping systems used to convey potable water.
1302.5
Flared Joints - for soft copper water tubing shall be made withfittings meeting approved standmds. The tubing shall be e,.pandcdwith a proper flaring tool.Cement Mortar Joints - Except forrepairs and connections to existing lines constructed with suchjoints, cement mortar joints arc prohibited on new buildingsewers.
1302.6
1302.7
Burned Lead Joints - shall be lapped and the assembly shall befuse(. N5 9
Revised National Plumbing Code of the Philippines
1406.2
Caulked-on closet rings or closet flanges shall not be less than6.4 mm thick and not less than 51 in overall depth.Closet rings ordosct flanges shall be burned or soldered to lead bends or leadferrule or c-aulked to cast iron soil pipe, solvent cemented to ABSor PVC tubes and ~crewcu or fastened in an approved manner to otherpipe materials
1406.3
\406.4
All such closet rings or closet flan ges shall be adequatelydesigned and sccur~d tu the water closet to support the fixtureconnected thereto and the water closet base shall be anchored withadditional pair of bolts to the concrete Hour. There wi ll be tour(4) bolts per water closet. Closets screws, bolts, washers, andsimilar fasteners shall be of brass, copper, or ot her listedequally corrosi~.) n resistunt materi als. All such screws andbolts shall be of adequate size and number to properly connect thefloor flange and anchor the fixture to the tloor.
1406.5
Section 1407- CLEANOUT Fl1TINGSll07. 1
Each clcanout fitting for cast iron soil pipe shall consist of acast iron or brass body and an approved screwed brass plug. Eachcleanout for galvanized wrought iron, galvani zed steel, copper orbrass pipe shall consist of a brass plug as specified in Table 14-4or a standard weight brass cap ~>r an approved ABS or PVCplastic coupling and plug. Plugs shall have raised square heads orapproved countersunk rectangular slots. when cleanout is installedalong travel ways. Each cleanout fitting and each cleanout plug orcap shall be of an approved type. Materials used fi)r cleanoutsshall conform t.o approved standards acceptable to theAdministrative Authority. C'lcancuts shall be designed to be gasand wate11igbt wi1hout !he any gasket, packing or washer.us~
1407.2
1407.3
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Stction 1408 - TH RF:AOI of Materials. Plumbing Matenals a~.,gesFitt:cgs CCiass IS~--I
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