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Pump suction Strainers Pressure Drop

Pump suction Strainers Pressure Drop

Pump suction Strainers Pressure Drop

Dear All,

As there are various types of pump suction strainers such as basket, Tee and Y type strainers which vary with respect to the need for automated flushing through blowdown, tolerance for heavy fouling services etc. What is the typical maximum allowable pressure drop which a designer need to account for a Tee strainer in determining the pump's NPSHA at the early design stage. Knowing that Crane considered around 35 D equivalent length for a suction Tee strainer, however when I compared such consideration to actual pump suction strainer vendor's pressure drop as 0.4 barg, I see that if the designer relies on specifying the strainer as a normal fitting without accounting for higher pressure drop contingency, there could be significant difference in the suction pressure calculated.
Therefore, for a typical low emulsion crude application, what should be the pressure drop contingency to be considered for suction Tee type strainer of a pump?

Appreciate your valuable views.

RE: Pump suction Strainers Pressure Drop

A normal assumption for a strainer pressure drop is about 0.1 bar clean, 0.5 dirty.

That's why suction strainers on systems with low inlet pressure / marginal NPSHA are not normally used.

So it's a bit of a risk about your pump, but better than it destroying itself due to cavitation due to a dirty strainer no one bothers to clean or even check to see if it needs cleaning.

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