Installation Guide
97
INSTALLATION PROCEDURES
The following chart shows the correct amount of tape and
torque required to make a properly functioning assembly.
1
⁄2
”
14 ft.lbs. 3 to 5 ft.lbs.
1
⁄2
”
width
3
⁄4
”
18 ft.lbs. 4 to 6 ft.lbs.
1
⁄2
”
width
1
”
24 ft.lbs. 5 to 7 ft.lbs
1
⁄2
”
width
1
1
⁄4
”
30 to 60 ft.lbs. 5 to 7 ft.lbs 1
”
width
1
1
⁄2
”
23 to 34 ft.lbs. 6 to 8 ft.lbs 1
”
width
2
”
36 to 50 ft.lbs. 8 to 10 ft.lbs 1
”
width
Note:1footpound=12inchpounds
Installation of Brass and CPVC Threaded Fittings
Torque Setting
Pipe Brass Threaded CPVC Threaded Teflon
Size Fittings Fittings Tape
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.
Testing with or use of compressed air or gas in PVC / ABS
/ CPVC pipe or fittings can result in explosive failures and
cause severe injury or death.
• NEVER test with or transport/store
compressed air or gas in PVC / ABS / CPVC
pipe or fittings.
• NEVER test PVC / ABS / CPVC pipe or
fittings with compressed air or gas, or air
over water boosters.
• ONLY use PVC / ABS / CPVC pipe or
fittings for water or approved chemicals.
• Refer to warnings in PPFA User Bulletin
4-80 and ASTM D 1785.
Important Information on
Threaded Connections
Millions of PVC, ABS and CPVC threaded ttings have
been produced over the years. When properly installed
these fittings provide excellent service in both pressure and
drainage applications. Some of the most common installation
errors include over tightening and the inappropriate use of
female adapters.
Tapered Threads
AmericanNationalStandardB2.1isthedominantstandard
used for threaded fittings in piping applications. Adherence
to this standard ensures that mating parts will thread properly
and provide appropriate service. ANS B2.1 requires that
fittings be made with tapered threads. Fittings with tapered
threads work like a wedge; the wedge forming the water
seal like a cork in a bottle and the threads holding the two
parts together. However,
this wedge also exerts
tremendous force which
can crack female fittings
just as a small wedge
tapped into a hole can be
used to split giant boulders
in a quarry.
In piping applications the force generated when a tapered
fitting (wedge) is tightened is referred to as strain. If a
threaded fitting is over tightened the strength of the plastic
material can be exceeded causing the material to yield and
the fitting to fail.
Strain increases as the pipe diameter decreases making it
easier to split smaller diameter threaded fittings than larger
fittings. At the same time it is easier for an installer to over
tighten small diameter fittings because less effort is required
to tighten them.
Female Adapters
In almost all plumbing applications threaded fittings are
used to transition from metal to plastic components in
a piping system (such as connections to valves, tanks or
other appurtenances). Due to the potential to over tighten
female plastic threaded parts Charlotte Pipe and Foundry
recommends that when transitioning from metal to plastic
components to always use plastic male threads (male adapter,
nipple, etc.) threaded into metal female threads (female
adapter, cap, tee, elbow, etc.). For the reasons cited above
the Uniform Plumbing Code expressly prohibits the use of
CTS CPVC female adapters.
An excellent example of an application where female
plastic threads can be a problem is the use of schedule 40