A.O. Smith 197835-001 Water Heater User Manual


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26
VENT PIPE PREPARATION
1. INITIAL PREPARATION.
A.)Makesure the solventcement you are planning touse
isdesignedforthespecicapplicationyouareattempting.
B.)Knowthephysicalandchemicalcharacteristicsandlimitationsofthe
PVCandCPVCpipingmaterialsthatyouareabouttouse.
C.)Knowthereputationofyourmanufacturerandtheirproducts.
D.)Knowyourownqualicationsorthoseofyourcontractor.Thesolvent
weldingtechniqueofjoiningPVCandCPVCpipeisaspecializedskill
justasanyotherpipettingtechnique.
E.)Closelysupervisetheinstallationandinspectthenishedjobbefore
start-up.
F.) Contactthemanufacturer,supplier,orcompetentconsulting
agencyifyouhaveanyquestionsabouttheapplicationor
installationofPVCandCPVCpipe.
G.)Takethetimeandefforttodoaprofessionaljob.Shortcutswillonly
causeyouproblemsanddelaysinstart-up.Byfar,themajorityof
failuresinPVCandCPVCsystemsaretheresultofshortcutsand/or
improperjoiningtechniques.
2. SELECTION OF MATERIALS.
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CuttingDevice-SaworPipeCutter.
•
DeburringTool,Knife,File,orBevelingMachine(2”andabove).
•
Brush - Pure Bristle.
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Rag-Cotton(NotSynthetic).
•
PrimerandCleaner.
•
SolventCement-PVCforPVCComponentsandCPVCforCPVC
Components.
•
Containers-MetalorGlasstoholdPrimerandCement.Selectthe
typeofPVCorCPVCmaterialstobeusedonthebasisoftheir
applicationwithrespecttochemicalresistance,pressurerating,
temperaturecharacteristics,etc.
•
InsertionTool-Helpfulforlargerdiameterpipeandttings6inches
(15.2cm)andabove.
PRIMER
ItisrecommendedthatTetrahydrofuran(THF)beusedtopreparethe
surfacesofpipeandttingsforsolventwelding.Donotusewater,
rags,gasolineoranyothersubstitutesforcleaningPVCorCPVC
surfaces.AchemicalcleanersuchasMEKmaybeused.
CEMENT
Thecementshouldbeabodiedcementofapproximately500to
1600centipoiseviscositycontaining10-20%(byweight)virginPVC
materialsolvatedwithtetrahydrofuran(THF).Smallquantitiesof
dimethylformamide(DMF)maybeincludedtoactasaretarding
agenttoextendcuringtime.Selectthepropercement;Schedule40
cementshouldbeusedforSchedule40pipe.Neveruseall-purpose
cements,commercialgluesandadhesivesorABScementtojoinPVC
orCPVCpipeandttings.
APPLICATORS
Selectasuitablepurebristletypepaintbrush.Useaproperwidthbrush
orrollertoapplytheprimerandcement(seechartbelow).Speedy
applicationofcementisimportantduetoitsfastdryingcharacteristics.
IMPORTANTNOTE:Adaubertypeapplicatorshouldonlybeused
onpipesizes2”andbelow.Forlargerdiameterpipe,abrushorroller
mustbeused.
RECOMMENDED BRUSH* SIZE FOR PRIMER
AND CEMENT APPLICATIONS
NominalPipe(IPS) SizeBrushWidth
2 1.5”(3.8cm)
3 1.5”-2.5”(3.8cm-6.4cm)
*USE ONLY NATURAL BRISTLE
3. MAKING THE JOINT.
A.)CuttingPipemustbesquarelycuttoallowfortheproper
interfacingofthepipeendandthettingsocketbottom.This
canbeaccomplishedwithamiterboxsaworwheeltypecutter
Wheeltypecuttersarenotgenerallyrecommendedforlarger
diameterssincetheytendtoarethecornerofthepipeend.If
thistypeofcutterisused,theareontheendmustbe
completelyremoved.
NOTE:Powersawsshouldbespecicallydesignedtocutplasticpipe.
STEP A
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