Frequently Asked Questions

These Frequently Asked Questions (FAQs) are to provide a better understanding of terms and topics to do with filtration and to answer the questions we regularly receive.

Units of Measure

How big is 0.1 micron?

0.1µm is 0.0001mm. There are 25,400 microns in one inch

What does PPM mean?

Parts per million (PPM). 1 PPM = 0.0001%

How can I convert from bar to psi?

1 bar = 14.5 psi

How can I convert from psi to bar?

1 psi = 0.69 bar

Filter Elements

Can you produce filter elements with custom dimensions?

We regularly supply special size filter elements with a range of diameters from 6mm up to 150mm and lengths from 10mm up to 1000mm.

What is the correct flow direction for disposable filter elements?

Single layer particulate filter elements should flow outside to inside through the filter element.

I have a filter housing from a competitor. Can you supply replacement filter elements?

Our filter elements are based on industry standard dimensions and grades so we can offer complete interchangeably for competitor products. We will save you money too!

What is delta P?

Delta P, or differential pressure, is the measurement of pressure drop across the filter element. Typically our filter element flow rates are calculated using an initial dry pressure drop of 0.1 bar (1.5 psig).

Filter Housings

How many ports do I need?

Usually an end-of-line filter will have one port. An in-line particulate filter housing will have 2 ports and a coalescing filter housing will have tree ports – the third port in the bowl is to allow removal of the liquid. Sometimes the third port will have a manual or automatic drain.

What pressures are filter housings designed to?

Housings can be used for negative and positive pressure applications giving a range from total vacuum to over 1300 bar.

Can you make me a special housing?

We can supply special housings from a single custom housing up to production runs.

Can you make filter housings in special materials?

Yes, we have experience of filter housings in a huge number of materials.

Do you charge to design a special housing?

All design work is free of charge.

Can you supply CAD drawings?

We can produce 3d and 2d drawings in several CAD file formats. Let us know what you need.

I have a filter element from a competitor. Can you make me a special housing for it?

No problem. Let us know what you need.

What if my vessel needs to be certified?

We can produce certified pressure vessels usually to ASME code.

Do you make housings with flanges or threaded ports?

Yes we have extensive experience with flanged and threaded connections. Let us know what you need and we should be able to accommodate.