How to Guide

106
Plastics Technical Manual
CPVC piping systems. If chemical compatibility with CPVC is
in question, Charlotte Pipe recommends isolating the suspect
product from contact with CPVC pipe or fittings.
NOTICE: In understanding spray polyurethane foams, there
aretwogeneralareasofconcernforCPVCpipeandttings;
(1) chemical compatibility and (2) potential damage to pipe
and fittings due to high temperatures generated as a result
of the exothermic chemical reaction during the installation
and curing process. It is possible to apply polyurethane foam
insulation properly without damage to CPVC pipe and fittings.
However,theuseofpolyurethanefoaminsulationinconjunc-
tion with CPVC has resulted in the failure of CPVC pipe and
fittings and property damage. Therefore, Charlotte Pipe and
Foundry does not recommend the use of polyurethane spray on
foam insulation in conjunction with CPVC pipe and fittings.
PleasecallCharlottePipeat800/438-6091orvisitourweb
site www.CharlottePipe.com for the latest CPVC Chemical
Compatibility sheet.
Care should be taken to isolate CPVC piping systems from
direct contact with heavy concentrations of termiticides. Vinyl
piping materials such as CPVC may be damaged by termiti-
cides where they are injected into the annular space between
the pipe wall and sleeving material trapping the termiticides
against the pipe wall. Common-sense precautions will prevent
installation problems.
CTS CPVC Pipe Passing
Through Studs
Plastic insulators do not need to be used when CPVC pipe
passesthroughwoodstuds.However,whenCPVCpipepasses
through metal studs, some form of protection must be used to
isolate the pipe from abrasion and to prevent noise.
Closed-Loop Systems
A closed-loop plumbing system is one in which water from the
premises side of the water meter is unable to backflow into the
main. This circumstance is becoming more and more prevalent
as the result of the growing use of devices such as backflow
preventers and pressure-reducing valves.
Allowancemustbemadefor“thermalexpansionofthewater.”
Backflow-prevention devices with built-in bypass capabilities,
auxiliary pressure-relief valves or bladder-type expansion tanks
are several options available to help resolve the problem and
to insure long-term system performance.
Piping systems differ in chemical resistance. Pipe or fittings
may be damaged by contact with products containing
incompatible chemicals resulting in property damage.
• Verify that paints, thread sealants, lubricants, plasticized
PVC products, foam insulations, caulks, leak detectors,
insecticides, termiticides, antifreeze solutions, pipe
sleeve, firestop materials or other materials are
chemically compatible with ABS, PVC or CPVC.
• Do not use edible oils such as Crisco
®
for lubricant.
• Read and follow chemical manufacturer’s literature
before using with piping materials.
SPECIAL CONSIDERATIONS
Connecting CTS CPVC to
Fixtures or Other Materials
Stub-outs for Plumbing Fixtures
CTS CPVC pipe can be used for stub-outs for lavatories,
closets and sinks.
Brass Compression Ferrules
CTS CPVC pipe can be used with standard brass ferrules to
make compression connections where the operating tempera-
turewillnotexceed140°F.TheO.D.ofcoppertubesize(CTS)
CPVCpipeisidenticaltothatofcopper.Werecommendthat
Teflon (PTFE) tape be applied over the ferrule to allow for the
dissimilar thermal expansion and contraction characteristics
of the metal ferrule and the plastic pipe that could possibly
result in a drip leak over a period of time. NOTICE: Do not
over-torque the compression connection as over-torquing may
resultinacrackedpipe.Non-metallicornylonferrulesare
not recommended.