Minimum flow requirement for filters?

by Jake
(Chicago)

If a filter is rated to handle 50 SCFM and the compressor I am using only puts out 3.7 SCFM will this lower output have an adverse effect on the filter?


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Jake, what the spec says is that the filter will allow up to the 50 CFM. If you were trying to push 70 CFM through that same filter, it would restrict the flow.

I can see no reason why it wouldn't work at 3.7 CFM.

The objection, as I see it, is that you are installing way to big a filter, and that might have some negative cost repercussions.

As long as you are getting the air out the end of the air line that you need, the larger filter is working, and you cannot harm it by moving a lower flow through it.

Cheers,

Bill


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filter low pressure at end of hose

by Hank Olzewski
(Phx. Az.)

I have a 5hp 60 gallon tank IR. compresser.

the tankgauge reads 150psi there is no regulator just a water trap a 50ft 3/8 hose and a new sandblaster with gauge that reads 50psi.

not enought pressure to run blaster.

I noticed in the past year, it has'nt ran impact or air ratcht properly also only been able to fill tires to about 50psi. what do you think. thanks Hank!

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Howdy Hank. A couple of things come to mind. First, I am surprised that you aren't using a regulator. Many devices don't like higher air pressure to run properly, and by giving higher pressure to tools than specified, you waste money on energy and increase wear on the tools.

The first thing I would check if this was my air compressor was the filter element in what you call the water trap. Make sure you turn off the compressor and dump all the air before you try to remove the filter bowl.

If the element is clean, the next thing I would check is whether the tank gauge is working. If the filter element is clean, and you have 150 PSI coming into the hose, unless you have a block in the hose somewhere, you should get 150 PSI out. The block I think you might have is a dirty filter element.

Cheers,

Bill
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Aug 29, 2011
dirty filter
by: Anonymous

Thanks Bill, I did not know there is a filter
in the water trap. I will check that tomorrow
and let you know. Thanks again Hank!

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Yes, please do let us know how it turns out.

B.


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Filter installation - where?

Are filters installed upstream or down stream on a compressor.
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Howdy.

Since the purpose of the air filter is to remove water and crud from the air stream emanating from your compressor tank, it needs to be installed downstream of the compressor tank.

If you have a large run, and a number of different applications plumbed for air, it is common to have a filter installed just before (upstream) of every application, as water will tend to condense in lines, regardless of how much is stripped out at the compressor.

Cheers,

Bill

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Air filter assembly

by Martin Harvey
(Camberley, Surrey, UK)

Filter unit

Filter unit

Filter unit
Air cleaner bowl with float assembly
Air cleaner filter and cap

Hi

We have a CNC punch with inline air filtration. The machine has recently been moved on the back of a lorry.

When we reconnected the machine in its new home, the air supply just bleeds straight down the water filtration outlet.

We have tried cleaning the glass phial, checking all the connections, dismantling and cleaning the float, even cleaning the air filter at the top of the unit.

Any suggestions?

Many thanks

Martin Harvey
Shop4metal Ltd

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If air is leaking out the filter auto drain, then either the float isn't seating, or a seal has become dislodged.

I can see no other reason why air should bleed right out the bottom.

If you cannot purchase a replacement float valve assembly for the filter, depending on how much time you want to spend fussing with it, it might be faster just to replace the whole unit with a similar sized filter. No need to replace the regulator or lubricator if you do, just a bit of plumbing since they are hard piped in.

Cheers,

Bill



Comments for Air filter assembly

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Jul 08, 2011
Air filter assembly
by: Martin at Shop4metal

Bill

Many thanks for the comments. That is sort of where we are at. I had the compressor serviced yesterday, and the chap couldn't replace the float assembly - he suggested the same.

Great website by the way!

Best regards

Martin@
Shop4metal

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Thank you sir, and you are most welcome.

B.

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