Hydrostatic test is done on a pump [ * ] to probe the integrity of its casting [ * ] and to verify that it can withstand its maximum allowable working pressure (MAWP). Testing is typically done at 1.5 times the MAWP, unless a different value is agreed upon with customer.
Hydrostatic testing is normally done with the pump fully assembled including its mechanical seal.
Segmental hydrotesting may be done if prior approval is obtained from customer. Segmental hydrotesting means that some components of a pump are tested at a pressure lower than its MAWP to prevent the expensive over-designing of a component, such as an outer barrel which will be subjected to suction pressure only, and not to the discharge pressure of the pump.
If the pump will operate at some critical conditions such as low specific gravity, or high operating temperature, hydrotesting using lighter gravity liquid, such as kerosene, may be preferred in lieu of water.
The test must be conducted in a secured and safe environment. Access to the test area shall be restricted to authorized persons only. Typical test duration is one hour per [ ** ] case thickness, unless other duration is specified.
If the pump failed it hydrotest the necessary corrective actions should be done based on approved procedures or methodology.
If the pump passed the hydrotest some form of identification via tag, or stamp, shall be made and attached to the unit to indicate that it passed the test. A test certificate shall be issued, if required by customer.
[ * ] For simplicity, the term "pump", as used herein, shall mean the complete pump assembly, or the pressure-containment component of a pump such as casing, cover, stuffing box, barrel, etc. The term "casting" shall mean a casting, a forging, a fabrication, or a combination of these.
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