Fuel pump sock filter - recommended surface area

[rpinheiro]

How does one calculate the minimum surface area of the suction filter needed for a fuel pump application?

 

[IRstuff]

One generally tries to ensure that the resistance of the filter is much less than the capacity of the pump, doesn't one?

TTFN

FAQ731-376
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[ivymike]

the question sounds like one a filter designer would need to know the answer to... and he'd probably have some tables showing restriction for various geometries based on test.

an application person would need to answer a question more like "which filter do i need to pick from this catalog to meet the allowable pressure drop requirements of my low pressure fuel system," and the answer would probably be along the lines of "these 5 models give pressure drop lower than 20kPa, when dirty, for the flow rates I have in mind... but version 3 is the cheapest."

 

[Warpspeed]

For any type of filter, working environment, clogging factor, and service life need to be taken into account.

It is probably more a case of rule of thumb experience than strict theoretical calculation.

I would be looking at industry best current practice for that type of installation.

Or more crudely put, monkey see, monkey do.

 

[1gibson]

Free/open area of X times the pump inlet diameter when the filter is XX% clogged

 

[TheBlacksmith]

Gasoline has a relatively high vapor pressure; if you lower the pressure enough, it will turn from a liquid to a gas and vapor lock the pump. Knowing this, most pump manufacturers will determine the minimum net positive suction head (NSPH) or absolute pressure necessary at the pump inlet to avoid vapor lock. Pick a sock that, with XX clogging, at the maximum rate of flow, provides a NPSH that exceeds the pump's requirements.

 

[WGJ]

As the pump installation has usually already been compromised by the tank designers, you use the maximum area of the lowest resitriction media of the maximum allowable particle size.

Bill