CHAPTER 29 WATER SUPPLY AND DISTRIBUTION

14 Pages·2006·0.17 MB·English

CHAPTER 29
WATER SUPPLY AND DISTRIBUTION
ASSE 1035, ASSE 1052, CSA CAN/CSA B64.2, CSA
SECTION P2901
CAN/CSAB64.2.2,CSAB64.7.Thesedevicesshalloper-
GENERAL
ate under normal atmospheric pressure when the critical
P2901.1Potablewaterrequired.Dwellingunitsshallbepro-
level is installed at the required height.
videdwithasupplyofpotablewaterintheamountsandpres-
sures specified in this chapter. In a building where both a P2902.2.3Backflowpreventerwithintermediateatmo-
potableandnonpotablewater-distributionsystemareinstalled, sphericvent.Backflowpreventerswithintermediateatmo-
eachsystemshallbeidentifiedbycolormarking,metaltagor spheric vents shall conform to ASSE 1012 or CSA
otherappropriatemethod.Anynonpotableoutletthatcouldin- CAN/CSAB64.3.Thesedevicesshallbepermittedtobein-
advertentlybeusedfordrinkingordomesticpurposesshallbe stalled where subject to continuous pressure conditions.
posted. The reliefopening shalldischarge by airgap and shallbe
prevented from being submerged.
P2902.2.4 Pressure-type vacuum breakers. Pres-
SECTION P2902
sure-type vacuum breakers shall conform to ASSE 1020
PROTECTION OF POTABLE WATER SUPPLY
andspill-proof vacuumbreakersshallcomplywithASSE
P2902.1General.Apotablewatersupplysystemshallbede- 1056.Thesedevicesaredesignedforinstallationundercon-
signedandinstalledinsuchamannerastopreventcontamina- tinuous pressure conditions when the critical level is in-
tionfromnonpotableliquids,solidsorgasesbeingintroduced stalled at the required height. Pressure-type vacuum
intothepotablewatersupply.Connectionsshallnotbemadeto breakers shall not be installed in locations where spillage
apotablewatersupplyinamannerthatcouldcontaminatethe could cause damage to the structure.
watersupplyorprovideacross-connectionbetweenthesupply
P2902.2.5 Reduced pressure principle backflow
andsourceofcontaminationunlessanapprovedbackflow-pre-
preventer. Reduced pressure principle backflow
ventiondeviceisprovided.Cross-connectionsbetweenanin-
preventersshallconformtoASSE1013,AWWAC511or
dividualwatersupplyandapotablepublicwatersupplyshall
CSACAN/CSAB64.4.Reducedpressuredetectorassem-
beprohibited,exceptwhereanappropriatecrosscontrolcon-
bly backflow preventers shall conform to ASSE 1047.
nectiondeviceisinstalledinaccordancewithSubpart5-1.31of
Thesedevicesarepermittedtobeinstalledwheresubject
the New York State Sanitary Code (10NYCRR).
to continuous pressure conditions. The relief opening
P2902.2Backflowprotection.Ameansofprotectionagainst shalldischargebyairgapandshallbepreventedfrombe-
backflow shall be provided in accordance with Sections ingsubmerged.
P2902.2.1 through P2902.2.6. Backflow prevention applica-
P2902.2.6Doublecheckvalveassemblies.Doublecheck
tions shall conform to Table P2902.2, except as specifically
valve assembliesshall conform to ASSE 1015 or AWWA
stated in Sections P2902.2 through P2902.4.
C510. Double-detector check valve assemblies shall con-
On-sitecontainmentinconformancewithSubpart5-1.31of formtoASSE1048.Thesedevicesshallbecapableofoper-
the New York State Sanitary Code (10 NYCRR) may be re- ation under continuous pressure.
quiredbytheproviderofpublicwater,dependingonthedegree
ofhazard,toprotectpublicwatersystemsthrough theuseof P2902.3Protectionofpotablewateroutlets.Allpotablewa-
appropriatebackflowprevention device installations. ter openings and outlets shall be protected by an air gap, re-
ducedpressureprinciplebackflowpreventerwithatmospheric
P2902.2.1 Air gaps. Air gaps shall comply with ASME
vent,atmospheric-typevacuumbreaker,pressure-typevacuum
A112.1.2 and air gap fittings shall comply with ASME
breaker or hose connectionbackflowpreventer.
A112.1.3. The minimum air gap shall be measured verti-
cally from the lowest end of a water supply outlet to the P2902.3.1Fillvalves.Flushtanksshallbeequippedwithan
floodlevelrimofthefixtureorreceptorintowhichsuchpo- antisiphon fill valve conforming to ASSE 1002 or CSA
tablewateroutletsdischarge.Theminimumrequiredairgap B125.Thefillvalvebackflowpreventershallbelocatedat
shallbetwicethediameteroftheeffectiveopening ofthe least1inch(25.4mm)abovethefullopeningoftheover-
outlet,butinnocaselessthanthevaluesspecifiedinTable flow pipe.
P2902.2.1.Anairgapisrequiredatthedischargepointofa
P2902.3.2 Deck-mounted and integral vacuum break-
reliefvalveorpiping.Airgapdevicesshallbeincorporated
ers.Approveddeck-mountedvacuumbreakersandfaucets
in dishwashing and clothes washing appliances.
with integral atmospheric or spill-proof vacuum breakers
P2902.2.2Atmospheric-typevacuumbreakers.Pipe-ap- shallbeinstalledinaccordancewiththemanufacturer’sin-
plied atmospheric-type vacuum breakers shall conform to stallation instructions and the requirements for labeling
ASSE1001orCSACAN/CSAB64.1.1.Hoseconnection withthecriticallevelnotlessthan1inch(25.4mm)above
vacuumbreakersshallconformtoASSE1011,ASSE1019, the flood level rim.
RESIDENTIAL CODE OF NEW YORK STATE 381
WATER SUPPLY AND DISTRIBUTION
TABLE P2902.2
APPLICATION FORBACKFLOWPREVENTERS
DEGREE OF APPLICABLE
DEVICE HAZARDa APPLICATIONb STANDARDS
Air gap High or low hazard Backsiphonageorbackpressure ASME A112.1.2
Air gap fittings for use with plumbing fixtures,
High or low hazard Backsiphonageorbackpressure ASME A112.1.3
appliances and appurtenances
Antisiphon-typefill valves for gravity water closet ASSE1002
High hazard Backsiphonageonly
flush tanks CSACAN/CSAB125
Backflowpreventerwith intermediate atmospheric Backpressureorbacksiphonage ASSE1012
Low hazard
vents Sizes1/ ″–3/ ″ CSACAN/CSA-B64.3
4 4
Double checkbackflowprevention assembly and
Backpressureorbacksiphonage ASSE1015
double check fire protectionbackflowprevention Low hazard Sizes3/ ″– 16″ AWWAC510
assembly 8
Backpressureorbacksiphonage
Double check detector fire protectionbackflow
Low hazard (Fire sprinkler systems) ASSE1048
prevention assemblies
Sizes 2″– 16″
Backpressureorbacksiphonage
Dual-check-valve-typebackflowpreventer Low hazard ASSE1024
Sizes1/ ″– 1″
4
Lowheadbackpressure,ratedworking
Hose connectionbackflowpreventer High or low hazard pressurebackpressureorbacksiphonage ASSE1052
Sizes1/ ″–1″
2
Lowheadbackpressureorbacksiphonage ASSE1011
Hose-connection vacuum breaker High or low hazard
Sizes1/ ″,3/ ″, 1″ CSACAN/CSA-B64.2
2 4
Laboratory faucetbackflowpreventer High or low hazard Lowheadbackpressureandbacksiphonage ASSE1035,CSAB64.7
Backsiphonageonly ASSE1001
Pipe-applied atmospheric-type vacuum breaker High or low hazard
Sizes1/ ″– 4″ CSACAN/CSA-B64.1.1
4
Backsiphonageonly
Pressure vacuum breaker assembly High or low hazard ASSE1020
Sizes1/ ″– 2″
2
Reduced pressure detector fire protectionbackflow Backsiphonageorbackpressure
High or low hazard ASSE1047
prevention assemblies (Fire sprinkler systems)
Reduced pressure principlebackflowpreventerand ASSE1013
Backpressureorbacksiphonage
reduced pressure principle fire protectionbackflow High or low hazard Sizes3/ ″- 16″ AWWAC511
preventer 8 CSACAN/CSAB64.4
Backsiphonageonly
Spillproofvacuum breaker High or low hazard ASSE1056
Sizes1/ ″- 2″
4
ASSE1019
Vacuum breaker wall hydrants, frost-resistant, Low headbackpressureor
automatic draining type High or low hazard backsiphonageSizes3/ ″, 1″ CSA
4 CAN/CSA-B64.2.2
For SI: 1 inch = 25.4 mm.
a. Low hazard—See Pollution (Section 202). High hazard—See Contamination (Section 202).
b. SeeBackpressure(Section 202). SeeBackpressure, Low Head (Section 202). SeeBacksiphonage(Section 202).
P2902.3.3 Hose connection. Sillcocks, hose bibbs, wall chines where backflow prevention is otherwise
hydrantsandotheropeningswithahoseconnectionshallbe provided or is integral with the machine.
protectedbyanatmospheric-typeorpressure-typevacuum
P2902.4 Protectionofpotablewaterconnections.Allcon-
breakerorapermanentlyattachedhoseconnectionvacuum
nections to the potable water shall conform to Sections
breaker.
P2902.4.1 through P2902.4.5.
Exceptions: P2902.4.1 Connections to boilers.Thepotablesupply to
theboilershallbeequippedwithabackflowpreventerwith
1. This section shall not apply to water heater and
an intermediate atmospheric vent complying with ASSE
boiler drain valves that are provided with hose
1012orCSACAN/CSAB64.3.Whereconditioningchemi-
connectionthreadsandthatareintendedonlyfor
calsareintroducedintothesystem,thepotablewatercon-
tank or vessel draining.
nectionshallbeprotectedbyanairgaporareducedpressure
2. Thissectionshallnotapplytowatersupplyvalves principlebackflowpreventercomplyingwithASSE1013,
intended for connection of clothes washing ma- CSACAN/CSAB64.3 orAWWAC511.
382 RESIDENTIAL CODE OF NEW YORK STATE
WATER SUPPLY AND DISTRIBUTION
P2902.4.2Heatexchangers.Heatexchangersutilizingan mand,thecapacitiesatthepointofoutletdischargeshallnotbe
essentially toxic transfer fluid shall be separated from the lessthanshowninTableP2903.1.Thereshallbeadequatepro-
potablewaterbydouble-wallconstruction.Anairgapopen visiontodrainthewatersystem.Theuseofcompressedairto
totheatmosphereshallbeprovidedbetweenthetwowalls. drainthewatersystemshallbeconsideredanadequateprovi-
Heat exchangers utilizing an essentially nontoxic transfer sion.
fluid shall bepermitted to be of single-wall construction.
P2903.1.1DisinfectionofPotableWaterSystem. Newor
P2902.4.3 Lawn irrigation systems. The potable water repairedpotablewatersystemsshallbepurgedofdeleteri-
supplytolawnirrigationsystemsshallbeprotectedagainst ousmatteranddisinfectedpriortoutilization. Themethod
backflow by an atmospheric-type vacuum breaker, a to be followed shall be in accordance with the applicable
pressure-typevacuumbreakerorareducedpressureprinci- New York State Department of Health regulations.
plebackflowpreventer.Avalveshallnotbeinstalleddown-
TABLE P2903.1
stream from an atmospheric vacuum breaker. Where
REQUIRED CAPACITIES AT
chemicalsareintroducedintothesystem,thepotablewater POINT OF OUTLET DISCHARGE
supply shall be protected against backflow by a reduced
FLOW
pressure principlebackflowpreventer.
FLOW RATE PRESSURE
FIXTURE AT POINT OF OUTLET (gpm) (psi)
P2902.4.4 Connections to automatic fire sprinkler sys-
tems.Thepotablewatersupplytoautomaticfiresprinkler Bathtub 4 8
systems shall be protected against backflow by a double
Bidet 2 4
check-valve assembly or a reduced pressure principle
backflowpreventer. Dishwasher 2.75 8
Exception:Wheresystemsareinstalledasaportionof Laundry tub 4 8
thewaterdistributionsysteminaccordancewiththere-
quirementsofthiscodeandarenotprovidedwithafire Lavatory 2 8
departmentconnection,isolationofthewatersupplysys-
For SI: 1 gallon per minute = 3.785 L/m,
tem shall not be required. 1 pound per square inch = 6.895kPa.
P2902.4.4.1 Additives or nonpotable source. Where
P2903.2Maximumflowandwaterconsumption.Themaxi-
systems contain chemical additives or antifreeze, or
mum water consumption flow rates and quantities for all
wheresystemsareconnectedtoanonpotablesecondary
plumbing fixtures and fixture fittings shall be in accordance
watersupply,thepotablewatersupplyshallbeprotected
with Table P2903.2.
against backflow by a reduced pressure principle
backflow preventer. Where chemical additives or anti- TABLE P2903.2
freeze is added to only a portion of an automatic fire MAXIMUM FLOW RATES AND CONSUMPTION FOR
sprinklerorstandpipesystem,thereducedpressureprin- PLUMBING FIXTURES AND FIXTUREFITTINGSb
ciplebackflowpreventershallbepermittedtobelocated PLUMBING FIXTURE PLUMBING FIXTURE
so as to isolate that portion of the system. OR FIXTURE FITTING OR FIXTURE FITTING
P2902.4.5Solarsystems.Thepotablewatersupplytoaso- Lavatory faucet 2.2gpmat 60 psi
larsystemshallbeequippedwithabackflowpreventerwith
Showerheada 2.5gpmat 80 psi
intermediateatmosphericventcomplyingwithASSE1012
orareducedpressureprinciplebackflowpreventercomply- Sink faucet 2.2gpmat 60 psi
ingwithASSE1013.Wherechemicalsareutilized,thepo-
Water closet 1.6 gallons per flushing cycle
tablewatersupplyshallbeprotectedbyareducedpressure
principlebackflowpreventer. For SI: 1 gallon per minute = 3.785 L/m,
1 pound per square inch = 6.895kPa.
Exception:Whereallsolarsystempipingisapartofthe
a. A handheld shower spray is also a shower head.
potablewaterdistributionsystem,inaccordancewiththe b. Consumption tolerances shall be determined from referenced standards.
requirementsofthePlumbing CodeofNewYorkState,
andallcomponentsofthepipingsystemarelistedforpo- P2903.3 Minimum pressure. Minimum static pressure (as
table water use, cross-connection protection measure determined by the local water authority) at the building en-
shall not be required. tranceforeitherpublicorprivatewaterserviceshallbe40psi
(276kPa).
P2902.5Access.Allbackflowpreventiondevicesshallbeac-
cessible for inspection and servicing. P2903.3.1 Maximum pressure. Maximum static pressure
shallbe80psi(551kPa).Whenmainpressureexceeds80psi
(551kPa),anapprovedpressure-reducingvalveconforming
SECTION P2903 toASSE1003shallbeinstalledonthedomesticwaterbranch
WATER-SUPPLY SYSTEM mainorriserattheconnectiontothewater-servicepipe.
P2903.1Watersupplysystemdesigncriteria.Thewaterser- P2903.4Thermalexpansion.Inadditiontotherequiredpres-
viceandwaterdistributionsystemsshallbedesignedandpipe sure relief valve, an approved device for thermal expansion
sizesshallbeselectedsuchthatunderconditionsofpeakde- controlshallbeinstalledonanywatersupplysystemutilizing
RESIDENTIAL CODE OF NEW YORK STATE 383
WATER SUPPLY AND DISTRIBUTION
storagewaterheatingequipmentwheneverthebuildingsupply ter-hammer arrestors shall be installed in accordance with
pressureexceedsthepressure-reducingvalvesettingorwhen manufacturers’ specifications. Water-hammer arrestors shall
any device, such as a pressure-reducing valve, backflow conform toASSE1010.
preventerorcheckvalve,isinstalledthatpreventspressurere-
P2903.6 Determining water-supply fixture units. Supply
liefthroughthebuildingsupply.Thethermalexpansioncontrol
loadsinthebuildingwater-distributionsystemshallbedeter-
deviceshallbesizedinaccordancewiththemanufacturer’sin-
mined by total load on the pipe being sized, in terms of wa-
stallation instructions.
ter-supplyfixtureunits(w.s.f.u.),asshowninTableP2903.6,
P2903.5Waterhammer.Theflowvelocityofthewaterdistri- andgallonperminute(gpm)flowrates[seeTable2903.6(1)].
bution systemshallbe controlled toreduce thepossibilityof Forfixturesnotlisted,chooseaw.s.f.u.valueofafixturewith
water hammer. A water-hammer arrestor shall be installed similar flow characteristics.
where quick-closing valves (see definition) are utilized. Wa-
TABLE P2903.6
WATER-SUPPLY FIXTURE-UNIT VALUES FOR VARIOUS PLUMBING FIXTURES AND FIXTURE GROUPS
WATER-SUPPLY FIXTURE-UNIT VALUE (w.s.f.u.)
TYPE OF FIXTURES OR GROUP OF FIXTURES Hot Cold Combined
Bathtub (with/without overhead shower head) 1.0 1.0 1.4
Clothes washer 1.0 1.0 1.4
Dishwasher 1.4 — 1.4
Hosebibb(sillcock)a — 2.5 2.5
Kitchen sink 1.0 1.0 1.4
Laundry tub 1.0 1.0 1.4
Lavatory 0.5 0.5 0.7
Shower stall 1.0 1.0 1.4
Water closet (tank type) — 2.2 2.2
Full-bath group with bathtub (with/without
1.5 2.7 3.6
shower head) or shower stall
Half-bath group (water closet and lavatory) 0.5 2.5 2.6
Kitchen group (dishwasher and sink
1.9 1.0 2.5
with/without garbage grinder)
Laundry group (clothes washer standpipe and
1.8 1.8 2.5
laundry tub)
For SI: 1 gallon per minute = 3.785 L/m.
a. Thefixtureunitvalue2.5assumesaflowdemandof2.5gpm,suchasforanindividuallawnsprinklerdevice.Ifahosebibb/sillcockwillberequiredtofurnisha
greater flow rate, the equivalent fixture-unit value may be obtained from Table P2903.6 or Table P2903.7.
384 RESIDENTIAL CODE OF NEW YORK STATE
WATER SUPPLY AND DISTRIBUTION
TABLE P2903.6(1)
CONVERSIONS FROM WATER SUPPLY FIXTURE UNIT TO GALLON PER MINUTE FLOW RATES
SUPPLY SYSTEMS PREDOMINANTLY FOR FLUSH TANKS SUPPLY SYSTEM PREDOMINANTLY FOR FLUSH VALVES
Load Demand Load Demand
(Water supply (Water supply
fixture units) (Gallons per minute) (Cubic feet per minute) fixture units) (Gallons per minute) (Cubic feet per minute)
1 3.0 0.04104 — — —
2 5.0 0.0684 — — —
3 6.5 0.86892 — — —
4 8.0 1.06944 — — —
5 9.4 1.256592 5 15.0 2.0052
6 10.7 1.430376 6 17.4 2.326032
7 11.8 1.577424 7 19.8 2.646364
8 12.8 1.711104 8 22.2 2.967696
9 13.7 1.831416 9 24.6 3.288528
10 14.6 1.951728 10 27.0 3.60936
11 15.4 2.058672 11 27.8 3.716304
12 16.0 2.13888 12 28.6 3.823248
13 16.5 2.20572 13 29.4 3.930192
14 17.0 2.27256 14 30.2 4.037136
15 17.5 2.3394 15 31.0 4.14408
16 18.0 2.90624 16 31.8 4.241024
17 18.4 2.459712 17 32.6 4.357968
18 18.8 2.513184 18 33.4 4.464912
19 19.2 2.566656 19 34.2 4.571856
20 19.6 2.620128 20 35.0 4.6788
25 21.5 2.87412 25 38.0 5.07984
30 23.3 3.114744 30 42.0 5.61356
35 24.9 3.328632 35 44.0 5.88192
40 26.3 3.515784 40 46.0 6.14928
45 27.7 3.702936 45 48.0 6.41664
50 29.1 3.890088 50 50.0 6.684
For SI: 1 gallon per minute = 3.785 L/m, 1 cubic foot per minute = 0.4719 L/s.
RESIDENTIAL CODE OF NEW YORK STATE 385
WATER SUPPLY AND DISTRIBUTION
P2903.7Sizeofwater-servicemains,branchmainsandris- opedlength”columntoafixtureunitequalto,orgreater
ers.Theminimumsizewaterservicepipeshallbe3/ inch(19.1 thanthetotalinstallationdemandcalculatedbyusingthe
4
mm). Thesizeofthewaterservicepipefromapublicsource “combined” water supply fixture unit column of Table
shallbedeterminedbytheauthorityregulatingthepublicwater P2903.6.Readthewaterservicepipeandmetersizesin
supply. Thesizeofwaterservicemains,branchmainsandris- thefirstleft-handcolumnandthemaindistributionpipe
ers shall be determined according to water supply demand to the building in the second left-hand column on the
[gpm(L/m)],availablewaterpressure[psi(kPa)]andfriction same row.
lossduetothewatermeteranddevelopedlengthofpipe[feet
4. To determine the size of each water distribution pipe,
(m)],includingequivalentlengthoffittings. Thesizeofeach
startatthemostremoteoutletoneachbranch(eitherhot
waterdistributionsystemshallbedeterminedaccordingtothe
orcoldbranch)and,workingbacktowardthemaindis-
procedureoutlinedinthissectionorChapter6ofthePlumbing
tributionpipetothebuilding,addupthewatersupply
Code of New York State:
fixture unit demand passing through each segment of
1. Obtain the minimum daily static service pressure [psi thedistributionsystemusingtherelatedhotorcoldcol-
(kPa)] available (as determined by the local water au- umn of Table P2903.6. Knowing demand, the size of
thority)atthewatermeterorothersourceofsupplyatthe each segment shall be read from the second left-hand
installation location. Adjust this minimum daily static column of the same table and a maximum developed
pressure [psi (kPa)] for the following conditions: lengthcolumnselectedinSteps1and2,underthesame
ornextsmallersizemeterrow.Innocasedoesthesize
1.1.Determinethedifferenceinelevationbetweenthe
ofanybranchormainneedtobelargerthatthesizeof
sourceofsupplyandthehighestwatersupplyout-
themaindistributionpipetothebuildingestablishedin
let.Wherethehighestwatersupplyoutletislocated
Step3.
abovethesourceofsupply,deduct0.5psi(3.4kPa)
for each foot (0.3 m) of difference in elevation. P2903.8Parallelwater-distributionsystemmanifolds.Hot
Wherethehighestwatersupplyoutletislocatedbe- andcoldparallelwater-distributionsystemmanifoldswithin-
lowthesourceofsupply,add0.5psi(3.4kPa)for dividualdistributionlinestoeachfixtureorfixturefittingshall
eachfoot(0.3m)ofdifferenceinelevation. besizedandinstalledinaccordancewithSectionsP2903.8.1
1.2.Where a water pressure reducing valve is in- through P2903.8.7
stalledinthewaterdistributionsystem,themini-
P2903.8.1Sizingofmanifolds.Manifoldsshallbesizedin
mum daily static water pressure available is 80
accordancewithTableP2903.8.1.Totalgallonsperminute
percentoftheminimumdailystaticwaterpres-
is the demand for all outlets.
sure at the source of supply or the set pressure
downstream of the pressure reducing valve, P2903.8.2Minimumsize.Theminimumsizeofindividual
whichever is smaller. distributionlinesshallbe3/ inch(9.5mm).Certainfixtures
8
suchasone-piecewaterclosetsandwhirlpoolbathtubsshall
1.3.Deductallpressurelossesduetospecialequip-
requirealargersizewherespecifiedbythemanufacturer.If
ment such as a backflow preventer, water filter
awaterheaterisfedfromtheendofacoldwatermanifold,
and water softener. Pressure loss data for each
themanifoldshallbeonesizelargerthanthewaterheater
pieceofequipmentshallbeobtainedthroughthe
feed.
manufacturer of such devices.
1.4.Deduct thepressure inexcessof 8 psi(55 kPa) P2903.8.3Maximumlength.Themaximumlengthofindi-
due to installation of the special plumbing fix- vidual distribution lines shall be 60 feet (18 288 mm)
ture,suchastemperaturecontrolledshowerand nominal.
flushometertank water closet.
P2903.8.4Orientation.Manifoldsshallbepermittedtobe
Using the resulting minimum available pres- installed in a horizontal or vertical position.
sure, find the corresponding pressure range in
P2903.8.5Supportandprotection.Plasticpipingbundles
Table P2903.7.
shallbesecuredinaccordancewiththemanufacturer’sin-
2. Themaximumdevelopedlengthforwaterpipingisthe
stallation instructions and supported in accordance with
actuallengthofpipebetweenthesourceofsupplyand
Section P2605. Bundles that have a change in direction
themostremotefixture,includingeitherhot(throughthe
equaltoorgreaterthan45degrees(0.79rad)shallbepro-
waterheater)orcoldwaterbranchesmultipliedbyafac-
tected from chaffing at the point of contact with framing
tor of 1.2 to compensate for pressure loss through fit-
members by sleeving or wrapping.
tings.
P2903.8.6Valving.Fixturevalves,wheninstalled,shallbe
SelecttheappropriatecolumninTableP2903.7equal
locatedeitheratthefixtureoratthemanifold.Ifvalvesare
to or greater than the calculated maximum developed
installedatthemanifold,theyshallbelabeledindicatingthe
length.
fixture served.
3. To determine the size of water service pipe, meter and
maindistributionpipetothebuildingusingtheappropri- P2903.8.7Hosebibbbleed.Areadilyaccessibleairbleed
ate table, follow down the selected “maximum devel- shallbeinstalledinhosebibbsuppliesatthemanifoldorat
the hosebibbexit point.
386 RESIDENTIAL CODE OF NEW YORK STATE
WATER SUPPLY AND DISTRIBUTION
TABLE P2903.7
MINIMUM SIZE OF WATER METERS,MAINS AND DISTRIBUTION PIPING
BASED ON WATER SUPPLY FIXTURE UNIT VALUES
Pressure Range—30 to 39 psi
METER AND DISTRIBUTION MAXIMUM DEVELOPMENT LENGTH (feet)
SERVICE PIPE PIPE
(inches) (inches) 40 60
3/ 1/ a 2.5 2
4 2
3/ 3/ 9.5 7.5
4 4
3/ 1 32 25
4
1 1 32 32
3/ 11/ 32 32
4 4
1 11/ 80 80
4
11/ 11/ 80 80
2 4
1 11/ 87 87
2
11/ 11/ 151 151
2 2
Pressure Range—40 to 49 psi
METER AND DISTRIBUTION MAXIMUM DEVELOPMENT LENGTH (feet)
SERVICE PIPE PIPE
(inches) (inches) 40 60
3/ 1/ a 3 2.5
4 2
3/ 3/ 9.5 9.5
4 4
3/ 1 32 32
4
1 1 32 32
3/ 11/ 32 32
4 4
1 11/ 80 80
4
11/ 11/ 80 80
2 4
1 11/ 87 87
2
11/ 11/ 151 151
2 2
Pressure Range—50 to 60 psi
METER AND DISTRIBUTION MAXIMUM DEVELOPMENT LENGTH (feet)
SERVICE PIPE PIPE
(inches) (inches) 40 60
3/ 1/ a 3 3
4 2
3/ 3/ 9.5 9.5
4 4
3/ 1 32 32
4
1 1 32 32
3/ 11/ 32 32
4 4
1 11/ 80 80
4
11/ 11/ 80 80
2 4
1 11/ 87 87
2
11/ 11/ 151 151
2 2
(continued)
RESIDENTIAL CODE OF NEW YORK STATE 387
WATER SUPPLY AND DISTRIBUTION
TABLE P2903.7—continued
MINIMUM SIZE OF WATER METERS,MAINS AND DISTRIBUTION PIPING
BASED ON WATER SUPPLY FIXTURE UNIT VALUES
Pressure Range—greater than 60 psi
METER AND DISTRIBUTION MAXIMUM DEVELOPMENT LENGTH (feet)
SERVICE PIPE PIPE
(inches) (inches) 40 60
3/ 1/ a 3 3
4 2
3/ 3/ 9.5 9.5
4 4
3/ 1 32 32
4
1 1 32 32
3/ 11/ 32 32
4 4
1 11/ 80 80
4
11/ 11/ 80 80
2 4
1 11/ 87 87
2
11/ 11/ 151 151
2 2
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895kPa.
a. Minimum size for building supply is3/-inch pipe.
4
TABLE P2903.8.1
MANIFOLD SIZING
PLASTIC METALLIC
Nominal Size ID Maximuma Nominal Size ID Maximuma
(inches) gpm (inches) gpm
3/ 17 3/ 11
4 4
1 29 1 20
11/ 46 11/ 31
4 4
11/ 66 11/ 44
2 2
For SI: 1 inch = 25.4 mm, 1 gallon per minute = 3.785 L/m, 1 foot per second = 0.3048 m/s.
NOTE:See Table P2903.6 for w.s.f.u and Table 2903.6(1) for gallon-per-minute (gpm) flow rates.
a. Based on velocity limitation: plastic—12 fps; metal—8 fps.
388 RESIDENTIAL CODE OF NEW YORK STATE
WATER SUPPLY AND DISTRIBUTION
P2903.9 Valves.Valvesshallbeinstalledinaccordancewith Exception: Frost-proof hose bibbs installed such that the
Sections P2903.9.1 through P2903.9.3. stemextends through thebuilding insulationintoanopen
heated or semi-conditioned space need not be separately
P2903.9.1Servicevalve.Eachdwellingunitshallbepro- valved. (See Figure P2903.10.)
vided with an accessible main shutoff valve near the en-
tranceofthewaterservice.Thevalveshallbeofafull-open
typehavingnominalrestrictiontoflow,withprovisionfor
drainagesuchasableedorificeorinstallationofaseparate SECTION P2904
drainvalve.Additionally,thewaterserviceshallbevalved MATERIALS,JOINTS AND CONNECTIONS
at the curb or property line in accordance with local
requirements. P2904.1Soilandgroundwater.Theinstallationofwaterser-
vicepiping,fittings,valves,appurtenancesandgasketsshallbe
P2903.9.2 Water heater valve. A readily accessible prohibited insoiland groundwaterthatiscontaminated with
full-open valve shall be installed in the cold-water supply solvents,fuels,organiccompoundsorotherdetrimentalmate-
pipe to each water heater at or near the water heater. rials that cause permeation, corrosion, degradation or struc-
tural failure of the water service material.
P2903.9.3Valverequirements.Valvesservingindividual
fixtures, appliances, risersand branches shallbe provided P2904.1.1Investigationrequired.Wheredetrimentalcon-
withaccess.Anindividualshutoffvalveshallberequiredon ditions are suspected, a chemical analysis of the soil and
thefixturesupplypipetoeachplumbingfixtureotherthan groundwater conditions shall be required to ascertain the
bathtubs and showers. acceptabilityof the water service materialfor the specific
installation.
P2903.10Hosebibb.Hosebibbssubjecttofreezing,including
the “frost-proof” type, shall be equipped with an accessible P2904.1.2 Detrimental condition. When a detrimental
stop-and-waste-typevalveinsidethebuildingsothattheymay condition exists, approved alternate materials or alternate
be controlled and/or drained during cold periods. routing shall be required.
FIGURE P2903.10
TYPICAL FROST-PROOF HOSE BIBB INSTALLATION NOT REQUIRING SEPARATE VALUE
RESIDENTIAL CODE OF NEW YORK STATE 389
WATER SUPPLY AND DISTRIBUTION
TABLE P2904.4.1
WATER SERVICEPIPEa
Acrylonitrile butadiene styrene (ABS) plastic pipe ASTM D 1527; ASTM D 2282
Asbestos-cement pipe ASTM C 296
Brass pipe ASTM B 43
Chlorinated polyvinyl chloride (CPVC) plastic pipe ASTM D 2846; ASTM F 441; ASTM F 442;CSAB137.6
Copper or copper-alloy pipe ASTM B 42; ASTM B 302
Copper or copper-alloy tubing (Type K,WK, L, WL, M orWM) ASTM B 75; ASTM B 88; ASTM B 251; ASTM B 447
Cross-linked polyethylene/aluminum/cross-linked polyethylene
ASTM F 1281;CSACAN/CSAB137.10
(PEX-AL-PEX) pipe
Cross-linked polyethylene (PEX) plastic tubing ASTM F 876; ASTM F 877;CSAB137.5
Ductile iron water pipe AWWAC151;AWWAC115
Galvanized steel pipe ASTM A 53
Polybutylene (PB) plastic pipe and tubing ASTM D 2662; ASTM D 2666; ASTM D 3309;CSAB137.8M
Polyethylene/aluminum/polyethylene (PE-AL-PE) pipe ASTM F 1282;CSACAN/CSA-B137.9M
Polyethylene (PE) plastic pipe ASTM D 2239;CSA-B137.1
Polyethylene (PE) plastic tubing ASTM D 2737;CSAB137.1
Polyvinyl chloride (PVC) plastic pipe ASTM D 1785; ASTM D 2241; ASTM D 2672;CSAB137.3
Stainless steel (Type 304/304L) pipe ASTM A312; ASTM A778
Stainless steel (Type 316/316L) pipe ASTM A312; ASTM A778
P2904.2 Lead content. Pipe and fittings utilized in the wa- P2904.4.2 Water-servicepipeseparationfrombuilding
ter-supply system shall have a maximum of 8 percent lead. sewerpipe.Thewater-servicepipeshallbeseparatedfrom
thebuildingsewerbyaminimumof5feet(1524mm),mea-
P2904.3Polyethyleneplasticpipinginstallation.Polyethyl- sured horizontally, of undisturbed or compacted earth or
enepipeshallbecutsquare,usingacutterdesignedforplastic placedonasolidledgeatleast12inches(305mm)above
pipe. Except when joined by heat fusion, pipe ends shall be and to one side of the highest point in the sewer line.
chamfered toremovesharp edges. Pipethathasbeen kinked
P2904.5 Water-distribution pipe. Water-distribution piping
shall not be installed. For bends, the installed radius of pipe
withindwellingunitsshallconformtoANSI/NSF61andshall
curvatureshallbegreaterthan30pipediametersorthecoilra-
conform to one of the standards listed in Table P2904.5. All
diuswhenbendingwiththecoil.Coiledpipeshallnotbebent
hot-water-distributionpipeandtubing shallhaveaminimum
beyondstraight.Bendsshallnotbepermittedwithintenpipe
pressure rating of 100 psi at 180°F (689 kPaat 82°C).
diameters of any fitting or valve. Stiffener inserts used with
compression-typefittingsshallnotextendbeyondtheclampor
P2904.5.1Underconcreteslabs. Inaccessiblewaterdistribu-
nutofthefitting.Flaredjointsshallbepermittedwhererecom-
tionpipingunderslabsshallbecopperwatertubeminimum
mendedbythemanufacturerandmadebytheuseofatoolde-
TypeM,brass,ductileironpressurepipe,cross-linkedpolyeth-
signed for that operation.
ylene/aluminum/cross-linked polyethylene (PEX-AL-PEX)
pressure pipe, chlorinated polyvinyl chloride (CPVC) or
P2904.4Waterservicepipe.Waterservicepipeshallconform
cross-linkedpolyethylene(PEX)plasticpipeortubing—allto
to ANSI/NSF 61 and shall conform to one of the standards
be installed with approved fittings or bends. The minimum
listed in Table P2904.4.1. Water service pipe or tubing, in-
pressureratingforplasticpipeortubinginstalledunderslabs
stalledundergroundandoutsideofthestructure,shallhavea
shallbe100psiat180°F(689kPaat82°C).
minimumworkingpressureratingof160psiat73°F(1100kPa
at 23°C). P2904.6Fittings.Pipefittingsshallbeapprovedforinstalla-
tionwiththepipingmaterialinstalled,andshallconformtothe
P2904.4.1Waterserviceinstallation.Trenching,pipein- respectivepipestandardslistedinTableP2904.6.Pipefittings
stallationandbackfillingshallbeinaccordancewithSec- utilized in the water supply system shall also conform to
tion P2604. ANSI/NSF 61.
390 RESIDENTIAL CODE OF NEW YORK STATE