What test involves subjecting a closed piping system to increased pressure for integrity verification?

The hydrostatic test is used to evaluate the integrity and strength of a closed piping system by subjecting it to a pressure that is typically higher than its normal operational pressure. This testing method involves filling the system with water and then applying pressure. The primary objective is to ensure that there are no leaks or weaknesses in the piping materials or joints, as any failure during the test would indicate a potential hazard in real-world conditions when the system is operational.

It is a crucial practice in the installation and maintenance of private fire service mains because it helps verify that the system can withstand the pressures it will face during firefighting operations without failing. This test provides confidence in the reliability and safety of the fire service mains, which are critical for effective fire protection.

In comparison, the flow test measures the actual flow rates and pressures that the system can deliver under operational conditions; the flushing test is meant to remove debris from the piping system; and hydraulic calculations are performed to determine the adequacy of the system design in terms of flow and pressure. While each of these is important in their own context, none focus specifically on verifying the physical integrity of the piping system under pressure like the hydrostatic test does.