Page 68 - CPVC Fire Sprinkler Products Installation Instructions & Technical Handbook
P. 68

while performing any air test. Prior to pressurization and for the duration
of the test, all personnel must be evacuated from the test area.
Note: This recommendation applies only when the pre-testing of a sys- tem has been deemed necessary. Pre-testing with low pressure air or nitrogen is not a substitute for hydrostatic testing, which is required by the installation standard (i.e., NFPA).
In Cold Weather
TFP-500 and TFP-600 One Step Solvent Cements are suitable for joining TYCO CPVC Pipe and Fittings during cold weather temperatures as low as 0°F (-18°C) minimum (assembly in temperatures below 0°F (-18°C) are not permitted). The time period for bonding CPVC pipe and fittings is affected by temperature; therefore, very cold weather requires extra time to cure cemented joints.
When assembling a CPVC pipe and fitting system requiring pressure testing at 225 psi (15,5 bar) (See Table W) and the Ambient Temperature is less than 0°F (-18°C), the CPVC pipe and fittings must be conditioned in a freezer at 0°F (-18°C) for 24 hours prior to assembly. Immediately after the 24 hour conditioning period, join the pipe and fittings with TFP-500 or TFP-600 One Step Solvent Cement in the 0°F (-18°C) environment and allow to cure per Table W before pressure testing.
Very cold weather will make TYCO CPVC Pipe and Fittings brittle. Extra care should be taken during such conditions to prevent damage while handling, cutting, de-burring, beveling, and assembly.
Extra care must be exercised if using ratchet cutters as they may split the pipe if not properly used and maintained. See Cutting section on Page 61.
When working in cold weather, be aware that solvents formulated into TFP- 500 and TFP-600 cements penetrate and soften the CPVC surfaces more slowly than in warm weather. Colder temperatures require greater cure times due to the slower evaporation of primer in solvent cements. See Tables U, V and W for cure times at various temperature ranges.
Other considerations are required when preparing for and joining CPVC pipe and fittings in cold weather conditions:
1. Carefully read and follow all instructions before installation.
2. Prefabricate as much of the system as possible in a heated working area.
3. Store cements in a warm area when not in use and make sure they remain fluid. Do not allow the cement to freeze or become “jelly-like.” Gelled cement shall be discarded.
4. Take special care to remove moisture, including ice and snow.
5. When using TFP-500 or TFP-600 One Step Solvent Cement, primer shall never be used.
6. Allow a longer cure period before the system is used.

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