How to Guide

104
Plastics Technical Manual
successfully tested, it should be drained and the next section
prepared for testing.
6. Once an installation is completed and cured the system
should be filled with water and pressure tested in
accordance with local code requirements.
7. Any leaking joints or pipe must be cut out and replaced
and the line recharged and retested using the same
procedure.
INSTALLATION PROCEDURES
Entrapped Air
 Pressure surges associated with entrapped air may
result in serious personal injury, system failure, and
property damage.
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Do not exceed the maximum working pressure of any
system components including pipe, fittings, valves, molded
or cut threads, unions, mechanical coupling or flanges.
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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.
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Testing Pressure System
1. Prior to testing, safety precautions should be instituted to
protect personnel and property in case of test failure.
2. Conduct pressure testing with water.
3. The piping system should be adequately anchored to limit
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piping systems. Thrust blocking should be provided at
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4. The piping system should be slowly filled with water,
taking care to prevent surge and air entrapment. The flow
velocity should not exceed 5-feet per second for PVC and
8-feet per second for CPVC CTS (see Friction Loss and
Flow Velocity charts in this manual).
5. All trapped air must be slowly released. All valves and air
relief mechanisms should be opened so that the air can be
vented while the system is being filled.