Hydrostatic Pressure Tests Pump

By 18 January 2017

It is standard practice for the manufacturer to conduct hydrostatic tests for the parts of a pump that contain fluid under pressure. This means that the pump casing and, where applicable, parts like suction or casing covers are assembled with the internal parts, removed, and are then subjected to a hydrostatic test, generally for a minimum of 30 minutes. Such a test demonstrates that the casing containment is sound and that there is no leakage of fluid to the exterior.

Additional tests may be conducted by the pump manufacturer to determine the soundness of internal partitions separating areas of the pump operating under different pressures.

The definition of the applicable hydrostatic pressure for these tests varies. The most generally accepted definition is that given by the Hydraulic Institute Standards. Each part of the pump that contains fluid under pressure shall be capable of withstanding a hydrostatic test at not less than the greatest of the following:

• 150 percent of the pressure that will occur in that part when the pump is operated at rated conditions for the given application of the pump, except thermoset parts
• 125 percent of the pressure that would occur in that part when the pump is operating at rated speed for a given application, but with the pump discharge valve closed