609.4 Testing.

Upon completion of a section or of the entire hot and cold water supply system, the system shall be tested with water or air. The potable water test pressure shall be greater than or equal to the working pressure under which the system is to be used. The air pressure shall be a minimum of 50 psi (345 kPa). Plastic pipe shall not be tested with air. The piping system shall withstand the test pressure without showing evidence of leakage for a period of not less than 15 minutes. Exception: PEX, PP or PE-RT tube shall be permitted to be tested with air where permitted by the manufacturer’s instructions.

WATER SUPPLY AND DISTRIBUTION