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Calculating NPSH

3 min read

The most common problems encountered in a pumping system are located on the suction side of the pump. Both inlet design and NPSH are especially important parts of successful pump performance. This article will address NPSH.

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Defining NPSH 

NPSH stands for Net Positive Suction Head. It is the amount of Suction Head left after various losses have been deducted from a starting point. 

Positive Suction Head can be defined as pressure that causes liquid to enter the suction side of a pump. A pump does not suck liquid – a downward force is exerted on the liquid which allows it to enter the inlet of the pump. This ‘downward force’ is atmospheric pressure. 

NPSH has two distinct elements: 

  1. NPSHa...
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