How to Guide

114
Plastics Technical Manual
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.
Do not rely on an expansion tank to handle thermal expansion
of the piping system. Expansion tanks accommodate expansion
of the fluid, not longitudinal expansion of the pipe. The pip-
ing system must be designed to allow for thermal expansion.
All pipe thread sealants must conform to the requirements
of IAPMO’s PS 36 and with the thread sealant manufacturer
to confirm that these sealants are chemically compatible
with ABS, PVC, and CPVC. Incompatible pipe thread
sealants may result in the degradation of plastic pipe or
fittings resulting in product failure and 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.
• Confirm compatibility of pipe marking adhesive tape
with the manufacturer of the tape to ensure chemical
compatibility with CPVC pipe and fittings.
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.
SUPPLEMENTAL INFORMATION
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
FlowGuard Gold and Corzan domestic water system.
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
using IPS 714 or Oatey CPVC Heavy Duty Orange solvent
cements.
• Installation should be in accordance with normal industry
standards, good plumbing practices, applicable plumbing
codes, building codes and other regulations.
• Follow recommended safe work practices.
• Follow proper material handling procedures.
• Keep pipe and fittings in original packaging until needed.
• Cover pipe and fittings with opaque tarp when stored
outdoors.
• Make certain that thread sealants, gasket lubricants and
firestop materials are compatible with CPVC pipe and
fittings.
• Use only latex paint if painting is desired.
• Use tools designed for plastic pipe and fittings.
• Cut pipe square.
• Deburr and bevel pipe before solvent cementing.
• Apply primer and cement with an applicator that is one
half the size of the pipe’s diameter.
• Rotate pipe
1
⁄4 to
1
⁄2 turn as the pipe is being inserted into
the fitting socket.
• Avoid puddling of solvent cement in fitting or pipe.
• 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.
• Fill lines slowly and bleed all trapped air from the system
prior to conducting a hydrostatic test.
• Visually inspect all joints for proper cementing.