Warranty Guide

43
Temperature De-Rating for ASTM D 2846 CTS CPVC SDR 11 Piping Systems
Temperature De-Rating Pressure
°F Factor Rating, PSI
73 1.00 400
80 1.00 400
90 0.91 360
100 0.82 325
120 0.65 260
140 0.50 200
160 0.40 160
180 0.25 100
Example: Determine the maximum allowable operating
pressure for a CTS CPVC piping system with an operating
temperature of 140°F. The de-rating factor from the above
chart is 0.50. Maximum allowable operating pressure = 400
x 0.50 = 200 psi.
De-rating Threaded Fittings, Valves and
Unions
Pressure ratings shown are for socket (solvent cement) systems.
The system must always be de-rated to the pressure rating of
the lowest rated system component at the expected maximum
system operating temperature.
• For pressure ratings of flanges or unions, see flanges
and unions in the installation procedures section of this
manual.
• Pressure ratings of Sch. 40 and Sch. 80 molded or cut
threads are 50% of solvent cement systems. Please see
table in the Threaded Joints and Threading of PVC and
CPVC Pipe section of this manual.
Source: PPFA Bulletin No. 2-80 (10/79)
DESIGN & ENGINEERING DATA
• For pressure ratings of valves or other system components,
always consult the technical recommendations from the
manufacturers of those products.
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.
Do not exceed the maximum working pressure of any
system components including pipe, fittings, valves, molded
or cut threads, unions, mechanical coupling or flanges.
• The pressure rating of all components must be reduced at
temperatures above 73 degrees F. Refer to de-rating table
in this manual.
• Exceeding the maximum working temperature or
pressure of the system may result in system failure and
property damage.