Removing Water from a Diesel Sample with a PTFE Membrane

One of our OEM customers successfully uses the SML206.221.M8 PTFE Membrane Housing to remove water from a diesel sample system prior to an on-line analyser.

SML304.221 PTFE-Membrane Housing

Recently a new application required a larger flow rate at lower pressure so we designed a new sized housing for them. The SML304 series uses a larger 89mm diameter PTFE membrane so the sample flow rate can be greatly increased. The lower pressure rating (35 bar) allows the housing to be smaller and gives a big cost saving.

How does the Membrane work with a Diesel Sample?

The principles are the same as for the gas application membranes – the higher surface tension of the water molecules cause them to be formed tightly together making them too large to fit through the pores of the membrane.


The M8 grade has a special support layer on the reverse of the membrane to increase the maximum pressure drop.

To ensure water is removed from the liquid hydrocarbon stream the contact
time with the membrane should be maximised and the SML housings feature a special flow-path to do this.

What else can we do?

We work closely with our OEM customers to deliver products, such as for this desiel sample system,  they need in a timely and cost-effective manor. Classic Filters has become the first port of call when a special filter, or membrane housing is required.

Need a special housing for your application?

Whether it is 1 or 1000 give us a call and we will design something for you.


You can contact us by calling +44 (0)1634 724224 or send us an email to [email protected]

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