Page 22 - CPVC Fire Sprinkler Products Installation Instructions & Technical Handbook
P. 22

Underground Water Pressure Service (UL & C-UL)
• Pipe - TYCO CPVC Pipe complies with the requirements of ASTM F442 and standard dimension ratio (SDR) 13.5. TYCO pipe is UL Listed and C-UL Listed for a rated pressure of 175 psi (12,1 bar) for underground service.
• Fittings - TYCO CPVC Fittings comply with the requirements of ASTM F438 (Schedule 40 socket), ASTM F439 (Schedule 80 socket) and ASTM F1970 (Transition fittings).
• Solvent Cement - All socket type joints shall be made in accordance with TFPP’s Installation Instructions using the TFP-500 or TFP-600 One Step Solvent Cement.
Note: When using TYCO CPVC Pipe and Fittings, installation must be in accordance with ASTM D2774, the standard recommended prac- tice for underground installation of thermoplastic pressure piping and ASTM F645, the standard guide for selection,
design, and installation of thermoplastic water pressure piping systems, and all TFPP installation instructions contained within this Installation Handbook.
• System Design - A TYCO CPVC underground system shall be hydrauli- cally calculated using a Hazen-Williams C-Factor of 150, and designed and installed in accordance with the “Installation of Sprinkler Systems,” NFPA 13, 2007 edition, and where appropriate the “Standard for Instal- lation of Private Fire Service Mains and Their Appurtenances,” NFPA 24.
• Installation Procedures - The installation procedures detailed within apply to TYCO CPVC Pipe that has solvent cemented joints in sizes ranging from 3/4 in. to 3 in. (DN20 to DN80).
• Inspection - Before installation, TYCO CPVC Pipe and Fittings should be thoroughly inspected for cuts, scratches, gouges, or split ends. Discard damaged pipe.
• Trenching - The trench should be of adequate width to allow convenient installation, while at the same time being as narrow as possible. Minimum trench widths may be utilized by joining pipe outside of the trench and lowering it into the trench after adequate joint strength has been achieved.
Note: Refer to TYCO’s instructions for recommended set and cure times for solvent cemented joints as found in Tables U, V, and W. Where pipe is joined in the trench, or where thermal expansion and contrac- tion are factors, trench widths may have to be widened. For additional details on expansion and contraction, see thermal expansion charac- teristics in Tables H1 and H2. Table B shows the trench width and mini- mum ground cover required for underground installation.
All TYCO CPVC Pipe that is water filled should be buried at least 12 in. (304,8 mm) below the maximum expected frost line. It is recommended that TYCO piping be run within a metal or concrete casing when it is installed beneath surfaces that are subject to heavy-weight or constant traffic such as roadways and railroad tracks.
The trench bottom should be continuous, relatively smooth and free of rocks. Where ledge rock, hardpan or boulders are encountered, it is necessary to pad the trench bottom using a minimum of 4 in. (102,0 mm)

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