For a newly installed 4" NPS piping system, what is the alternative test method compared to standard pressure testing?

In the context of testing a newly installed 4" NPS piping system, the alternative method mentioned is known as 1.5 times the maximum operating pressure testing. This method is often utilized because it ensures that the system can withstand pressures beyond normal operating conditions, providing a safety buffer.

By applying a test pressure that is 1.5 times greater than what the system will typically experience under normal operation, technicians can identify potential weaknesses or leaks before the system is put into service. This approach helps ensure the integrity and safety of the piping system, which is crucial for preventing leaks and ensuring operational reliability over time.

Compared to other methods, such as the sniff test or air testing, which might assess different aspects of the system (like leaks or the presence of gases), the pressure test specifically evaluates the strength of the piping material and connections under high stress. Visual inspection provides insight into the physical condition of the piping but does not assess its structural integrity under pressure. Thus, the 1.5 times maximum operating pressure test stands out as a robust and critical safety measure for newly installed systems.