How to Guide
110
Plastics Technical Manual
SPECIAL CONSIDERATIONS
another in physical contact with it, without appreciable dis-
placement oftheparticlesofthebody.”Thisdenitionleads
to the commonlyused “K” factor, which refers to thermal
conductivity.Notethattheunitsare“Btuperhour”forone
squarefootofsurfaceand“onedegreeFahrenheitperinch”
of material thickness.
Material Btu/h-Sq.Ft.-°/in
CPVC 1.0
PVC 1.3
PEX 2.4
Steel 312.0
Cast Iron 360.0
Copper 2,616.0
Condensation and Sweating
Due to its low coefficient of thermal conductivity, it is often not
necessary to insulate FlowGuard Gold CPVC against condensa-
tion within conditioned buildings. Two conditions that control
sweating of a pipe are (1) the pipe surface temperature, which
depends on the temperature of the water inside the pipe and
(2) the relative humidity of the air around the pipe. Because
each of the factors can vary greatly, it is possible that condi-
tionsexistthatcancauseCPVCpipetosweat.Undermost
conditions that cause copper pipe to sweat and drip, FlowGuard
Gold pipe will remain free of condensation.
UV Exposure
PleaseseetheWeatheringsectionofthistechnicalmanualfor
completeinformationonUVExposure.
Water Hammer Arrestors
Quick closing valves, actuated valves, starting or stopping
pumps or rapid increases or decreases in system flow rate
canresultinpressuresurgeor“waterhammer”capableof
damaging PVC or CPVC piping systems. Systems should be
designed by the engineer of record and in conformance to local
code requirements to manage the effects of pressure surge. In
applications where severe or repeated water hammer is encoun-
tered, especially at elevated temperatures or in a commercial
laundry or commercial kitchen, the use of a water hammer
arrestor is advisable.
FlowGuard Gold
®
and Corzan
®
Domestic Water Systems
Do’s and Don’ts
While not a complete list, the following is intended to
highlight many of the Do’s and Don’ts when installing a
FlowGuardGoldandCorzandomesticwatersystem.
Do’s
• Do install CPVC Schedule 80 domestic water systems
using IPS P-70 or Oatey Industrial Grade primers.
• Do install CPVC Schedule 80 domestic water systems
usingIPS714orOateyCPVCHeavyDutyOrangesolvent
cements.
• Installationshouldbeinaccordancewithnormalindustry
standards, good plumbing practices, applicable plumbing
codes, building codes and other regulations.
• Followrecommendedsafeworkpractices.
• Followpropermaterialhandlingprocedures.
• Keeppipeandttingsinoriginalpackaginguntilneeded.
• Cover pipe and ttings with opaque tarp when stored
outdoors.
• Makecertainthatthreadsealants,gasketlubricantsand
firestop materials are compatible with CPVC pipe and
fittings.
• Useonlylatexpaintifpaintingisdesired.
• Usetoolsdesignedforplasticpipeandttings.
• Cutpipesquare.
• Deburrandbevelpipebeforesolventcementing.
• Applyprimerandcementwithanapplicatorthatisone
halfthesizeofthepipe’sdiameter.
• Rotatepipe
1
⁄4 to
1
⁄2 turn as the pipe is being inserted into
the fitting socket.
• Avoidpuddlingofsolventcementinttingorpipe.
• Follow recommended cure time for the required pipe
diameter and temperature.
• Align all piping system components properly without
strain. Do not bend or pull pipe into position after being
solvent welded.
• Filllinesslowlyandbleedalltrappedairfromthesystem
prior to conducting a hydrostatic test.