WHAT IS A HYDROSTATIC TEST?

The hydrostatic testing consists of filling an equipment with a fluid (generally colored water) at a set test pressure, and for a given period of time, to check the existence of leakages. The applied test pressure shall exceed the working pressure by a variable factor. While the equipment is under pressure, the staff checks possible leakages: the test is passed if the equipment is able to bear the test pressure without leaking for the set time, it fails in case leakages are detected.

Hydrostatic test

Before starting a hydrostatic test, the staff in charge should pay attention to the testing fluid chemistry and how it may impact the equipment.

When a hydrostatic testing on a specific equipment is not possible or recommended, the pneumatic test is a suitable alternative.

Hydrostatic testing is executed on pipes, fittings, pipe spools, vessels, valves and other mechanical equipment that is expected to withstand a nominal pressure.

 

HYDROSTATIC VS PNEUMATIC TEST

HYDROSTATIC TESTING

As noted above, a hydrostatic testing is executed by using chlorinated water or other fluid to check the existence of leakages in the equipment.

PNEUMATIC TEST

A pneumatic test uses compressed air or inert gases to test an equipment. Pneumatic tests are generally executed on low-pressure equipment or small parts or when a hydrostatic test cannot be executed for whatever reason.

A FAILED HYDROSTATIC TEST (VIDEO)

The video shows how a hydrostatic test is executed and a failure case: