All pipes in the building must be checked for leaks. Testing for leaks involves subjecting all pressurized (supply/return/fire sprinkler) pipes to hydrostatic pressure testing, which is measured by a water pressure gauge. Usually, the test requires the pipes to hold 150% of the normal operating pressure for 2 hours. Any drop in pressure indicates the presence of a leak in the line. Once this leak is found and repaired, the test is restarted for two hours. It should be noted that leaky joints must be tightened or taken apart and corrected. The application of pipe sealant to the outside of the pipe is not an approved correction method.
230 Construction Management for Industrial Projects