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Pump Shutoff Pressure - PSP:

PSP = Pump Maximum Suction Pressure + Pump Rated Differential Pressure * A

Where:

A = 1.25 for an electric motor
A = 1.35 for a turbine.

The obtained PSP shall be rounded up to nearest 0.5, for example if PSP = 15.6 barg shall be rounded up to 16.0 barg.

Why it’s important PSP ?

The PSP is setting the design pressure of downstream equipment that could be expose to PSP when the flow rate is stopped suddenly by a valve closure!

Apart of safety aspect there is also the economic aspect, meaning that if PSP is passing All the downstream system to #600 ussualy a PSV shall be added avoiding to rise the design pressure.

Remember that:

Pump Maximum Suction Pressure shall be computed using set pressure of safety valve from the suction vessel without accumulation and the pressure drop of equipment shall be computed for rated / overdesign case

Pump Differential Pressure shall be calculated at pump rated flow rate!

Always for the PUMP all the reported values from data sheet MUST be at PUMP RATED FLOW RATE!

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With respect and joy to share free technical info,
Mihail

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