Coalescent filter versus mist seperators

by Michael
(Richmond, Mi, US)

What is the difference between coalescent filter and mist separators. When and/or why should one be used over the other?

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Hello Michael, and thanks for writing in.

A mist separator is, to my mind, a fancy name for a compressed air filter, details of which are found on the Filters page on this site.

They will remove liquid from the air stream, both liquid water and liquid or mist oil.

A coalescent filter is designed to strip oil vapor from the compressed air stream. See the page on coalescent filters on this site for more info on them.

Cheers,

Bill

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Where can i buy a coalescent filter?

by Justin
(NY)

I have looking online all damn morning and can't find a web site where to buy them!



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Hi Justin..you're a bit frustrated in trying to find components, and I sure understand that. There's a lot of crap on the internet, and sometimes it's hard to find meaningful information.

If you Google Industrial Supplies or Compressor Equipment you may find listings for vendors in your area.

I don't know where in NY you are, so I can't be specific.

Know that you can add a coalescing element to most general purpose air filters.

www.grainger.com/Grainger/categories/pneumatics-and-hydraulics/air-treatment/coalescing-filter-element is a source for coalescing elements and if you call them, they'll tell you what filter you need to use the coalescent element of choice.

Hope this helps.

Bill

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Where to get a coalescent filter.

by Hayley

Hi

I am trying to get hold of a coalescent oil filter - Seko-A14-100.

Can you please advise who stok these.

Many thanks

Hayley
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Hi Hayley:

I'm not familiar with the brand...so perhaps one of our readers might chip in?

If you can't find that particular filter, why do you need to be brand specific?

Worst case scenario even for those filters that are integral parts of FRL's is that you can usually remove a segment of the FRL and replace it by nippling-in a different brand.

If you can't find the Seko, make sure the replacement filter is a coalescent unit with the same NPT size as the existing unit, and you should be OK.

You can get a lot more information on air filters (coalescent and otherwise on the Filters page on this site.

Cheers,

Bill

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Coalescent Filter for low air flow applications

by Pierre-Lucas Aubin-Fournier
(Montréal, Canada)

Hello,

Basically, I have a airbrush compressor setup, built with an old fridge compressor and a modified propane tank. It's all well and good except for an oil discharge problem.

A coalescent filter should solve that problem, but the only suitable model I found in a nearby shop is noted as "NOT suitable for flows less than 3.5 SCFM". http://fairchildproducts.com/allfiles/Filters%20NEW%202006.pdf

(the notes at the end of the second page)

I wondered what problems this might pose, since the airbrush barely demands 0,5 SCFM ?

I also wondered if a 0,01 micron filter would be overkill, or if it would be even more suitable with regards to the low air flow ?
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Hello Pierre-Lucas;

Congrats on building your own air brush compressor. Not something that I'd undertake, for sure.

You do need a coalescent filter to remove oil if oil is getting into the downstream air flow.

0.01 micron is the norm for coalescent filters that "coalesce" oil through adsorption.

If Fairchild says their coalescent filter requires more than 3.5 CFM of compressed air flow, then it will not work in your application.

One company that does a good job with air preparation and, in particular, coalescent type filters is Norgren. Their local distributor is Cowper Inc, located in Lachine, (www.Cowper.ca). Talk to them about getting the right coalescent filter for your application.

Cheers,

Bill

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