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8.7 Support of Plastic Pipe
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- Plastic drain, waste, vent, and pressure pipe shall be installed and supported as recommended by the manufacturer's instructions.
- Maximum horizontal support spacing shall be based on the pipe schedule or wall thickness, the pipe size, the system operating temperature, the ambient temperature, and any concentrated loads.
- Vertical pipe shall be maintained in straight alignment with supports at each story height. Intermediate supports shall be provided where required for stability.
- Pipe shall also be supported at changes of direction or elevation.
- Supports shall not compress, distort, cut, or abrade the piping and shall allow free movement.
- Provisions shall be made for expansion and contraction of the piping.
- Fixture trap arms longer than three feet shall be supported as close as possible to the trap.
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