Technical Specifications

116
Plastics Technical Manual
maximum recommended temperature and de-rating of work-
ing pressure applies to both heat generated from fluid being
distributed through pipe system and heat generated from
sources external to the pipe system.
CPVC can be connected to tankless gas water heaters using a
CPVC-to-brass threaded transition fitting. Verify code require-
ments prior to installation.
T/P Relief Valve Drainage Pipe
(Elevated-Temperature Performance)
CTS CPVC pipe conforming to ASTM D 2846 is rated for con-
tinuous operation at 180°F/100 psi. The following addresses
the expected capabilities of CPVC during short-term exposure
to temperatures and/or pressures above 180°F/100 psi that
may occur from time to time. However, CTS CPVC pipe is not
recommended for pressure applications where temperatures
will consistently exceed 180°F.
1. Use of CTS CPVC for T/P relief valve drainage lines
CPVC is a suitable material for T/P discharge piping. A
CPVC-to-brass transition fitting should be used connecting
to T/P relief valve.
FlowGuard Gold pipe and fittings meet the Uniform
Plumbing Code short term working pressure requirement
of 48 hours at 210°F/150 psi. Furthermore, CPVC pipe
is approved for T/P discharge piping under the following
model codes:
SBCCI Standard Plumbing Code - Section 1210.1.
BOCA BOCA National Plumbing Code -
Section P 1506.4.2 (1991)
UPC Uniform Plumbing Code -
Installation Std. IS-20 - Sec. 1007.1.
ICC International Code Council
Section 504.6.2/605.5
2. Short-term elevated pressure performance
CPVC meets the quality control provisions of the ASTM
D 2846 Standard (Table 5) which requires that CPVC-
CTS systems (pipe, fittings, and cemented joints) have
the capability of withstanding short-term pressure tests
at 180°F of at least 521 psi for 6 minutes and 364 psi
for 4 hours.
SUPPLEMENTAL INFORMATION
Use of FlowGuard Gold
®
CTS CPVC all-plastic threaded
male adapters in hot water applications may result in
system failure and property damage.
• Use plastic threaded CTS CPVC male adapters in cold
water applications only.
• Use CTS CPVC x brass threaded transition fittings for hot
water applications.
• Do not use compression fittings with brass ferrules to
connect to CTS CPVC pipe or fittings where water
temperatures will exceed 140 degrees F.
• CPVC pipe can be used with standard brass ferrules to
make compression connections where the operating
temperature will not exceed 140°F. Apply Teflon (PTFE)
tape over the ferrule to allow for the dissimilar thermal
expansion and contraction characteristics of the metal
ferrule and the plastic pipe.
Tub Fillers, Showerheads and Outside Sillcocks
CTS CPVC should be connected to tub fillers, showerheads
and outside sillcocks with a CPVC to brass threaded transition
fitting or a metal nipple. Direct connection to CPVC or CPVC
threaded fittings is not recommended.
Water Heaters / Boilers
Instructions from the manufacturer of the water heater and
applicable local plumbing and building codes should be fol-
lowed.
Do not use FlowGuard Gold CTS CPVC pipe or fittings on sys-
tems capable of achieving temperatures greater than 180°F.
When FlowGuard Gold CTS CPVC pipe is used with an elec-
tric water heater, a CPVC-to-brass transition fitting should
be used. CPVC threaded male adapters should not be used to
connect to water heaters or connect to metallic nipples in close
proximity to water heater.
When connecting to a gas water heater, at least 6 inches of
metal nipple or appliance connector should be used so that the
CPVC tubing cannot be damaged by the build-up of excessive
radiant heat from the draft diverter. Some high-efficiency
direct-vent gas water heaters eliminate the radiant heat from
the flue and can be piped directly to the water heater. A brass
threaded CPVC transition fitting must be used for connection
to the water heater.
NOTICE: Do not connect CTS CPVC or Schedule 80 CPVC
directly to a boiler due to excessive heat generated. The