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Subject: Re: compressed air issue

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Message Thread:

compressed air issue

4/17/18       
John S Member

I'm having a fish eye problem that I'm reasonably sure is being caused by something from the compressor or air hose.
Compressor is a 3.5 hp 60 gallon. Air goes through a 25 foot rubber air hose, through a small inline air regulator, small inline filter then through a gravity hvlp gun in that order.
In the past when this happens I would change the hose and filter and all would be fine again. But it's remained after those steps now.
I sprayed some finish out of the same can through a turbine and it was fine which led me to determine that it was somewhere in the compressed air. I also had a new gravity gun which I tried and it too caused fish eyes.
I guess I'm looking for ideas. Do compressors ever get old and just start blowing oil with the air?
Should I try a better quality, larger filter before the hose? And if that, what would be a good brand and any idea how much a good quality filter should cost?
I'm open to any other thoughts as well.
Also I'm spraying wb clears and pigmented. Either MLCampbell or Hood products if that matters at all. And not a high volume at a time. Usually only around 45 to 55 gallons per year.
Thanks in advance for any help or advice.
John

4/17/18       #2: compressed air issue ...
Leo G Member

Do you have an oil filter in the line after the water separater?

Inline oil filter

4/18/18       #4: compressed air issue ...
John S Member

Thanks Leo G. I just have the hose connected to the compressor then the inline filter (cheap $10) then inline regulator then gun.
I've never really worried much about it until now as it's always been fine this way for about 9 years.
Where in the run would you install the filter you suggested? I assume it would be right at the compressor?
Thanks
John

4/18/18       #5: compressed air issue ...
Leo G Member

The water separater should be at the farthest point away from the compressor as it can be put. And then the oil filter is placed after that.

If the filter(s) are placed to close to the compressor they don't work as well because the air hasn't had time to cool off. Hot air will hold the water better than cooler air.

A water filter right at the compressor is almost worthless.

4/18/18       #6: compressed air issue ...
Jim Clark  Member

compressors do get old and pass more oil,
Just like a car engine the rings will wear out over time.
If you're getting a lot of oil that a filter won't
fix for you, you'll have to rebuild the pump
with new rings.
Sometimes using a little heavier oil
for the pump can help.

 

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