After the piping system is installed and any solvent cement is fully cured, the system should be pressure tested and checked for leaks using water. Using compressed air or inert gas for testing is not recommended.
All entrapped air should be allowed to vent as the system is filled with water. Water filling should occur at a velocity not more than one foot per second. After filling, the system should be pressured to 125% of the maximum design pressure of the lowest rated part of the system. Pressure should then be held for no more than one hour while the system is checked for leaks.
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