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Air Compressors

3610 Views 25 Replies 10 Participants Last post by  DaninVan
I purchased a Makita Mac5200 air compressor primarily for a pin nailer and finish nailer but also for the occasional framer or small impact wrench. I am aware that the tank is too small and I plan on adding a second tank at so point.

My question is how much air loss should you expect from a tank over time? I am noticing that after about 8 hours with the machine unplugged it is going from 135 PSI to 125PSI. Eight hours more and it is 80PSI and additional 8 hours it is at 45PSI. With an additional 8 hours it is at 25PSI. Is this normal? Does it take a while for all the parts to seal?

Thanks guys.
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Our climate is obviously very different to yours. In my business we used a compressor all day long, air was reticulated to each bench. The compressor had a label saying to drain the tank each. In the weeks after getting this compressor we opened the drain tap each day but not a drop came out. Even checking it around monthly, still nothing came out so we stopped the procedure. After retiring and leaving the business to my son which he closed after about three years when the cost of a new superior VCR was less than the cost of a major repair.
After it closed I was given the compressor and the first thing that I did was open the drain and STILL not a drop came out. Never in use did any water come out of the air drivers or blowers.
At work at the fertilizer plant I work at they have air operated bin vibrators on the two load out bins to shake loose any fertilizer that sticks to the walls. They have maybe a 3 hp unit supplying the air. The chap I work under is fairly lazy and doesn't do the proper maintenance on the compressor he should be, namely draining the water out. Twice in the 5 years the plant has been in operation they vibrators have quit working because they became plugged up with water and the bit of oil from the cylinder walls in the head that makes it by the rings. When the repairman opened the pet cock you wouldn't believe how much gunk came out. I think it may have been a couple of 4 liter pails worth.
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Charles; for something like that, wouldn't an automatic drain make sense?

Stick; what part of "procrastination" was unclear? ;)
none of it...
I know you'll never get there...
that was for the benefit of the readership...
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About two years ago the tap on mine started to leak and I replaced it with one from Ebay that looks the same as the top right one in your picture. The photo above is taken from the thread "my shed now" some years old. It's too late tonight to have gone out and taken new shots.
CORRECTION...It's the same as the top LEFT one shown. It's an age thing confusing left and right!

if you can not find the leak, it maybe a bad check valve. compressor to tank. we at work have had some of the newer units have had this problem. we use lot more small units in labs you may want to make sure the unit has cycle enough to get a new all the valves to seat. if you not leaking beyond the tank. we even had that one had a bad tank weld. small systems seem to leak a lot more often than the large systems. AKA 200 to 500 gallon, 20 to 100 Hp.
hope this is some help.
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Biotec; welcome,if I haven't said it previously!
Please fill out your profile a bit...pretty sure you're posting from other than N.America (?)...good to know where members' experiences come from. :)
(Just click on your own name, over on the far left; a menu will open up for you.)
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