Pressure drop - air temperature or leak?

by Andrew
(UK)

Hello!


I recently bought my first air compressor for home use. It's got a 100l tank and cuts out at 115 PSI.

I've had a few initial problems with leaks, which now appear to be fixed (no bubbles visible from soapy water), but the tank is still losing some pressure...

When the compressor cuts out, I seem to lose around 8 PSI in around a couple of minutes, but then it doesn't drop further at any noticeable rate.

Do you think I have a leak somewhere (maybe inside the switch?), which only happens over a certain pressure? Or could it be a pressure drop from the cooling of the air?

Thanks,

Andrew

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Jan 14, 2019
Pressure drop
by: Doug in s.d.ca.

"Do you think I have a leak somewhere (maybe inside the switch?), which only happens over a certain pressure? Or could it be a pressure drop from the cooling of the air?"

Absolutely. Maybe a bit of both.

Depending where it is, and the temperature (what - 10℃ outdoors lately?), cooling is almost certainly a factor, at least.

If you can transpose your gauges, you might do that and see if you get the same readings. If not, the gauge that was the tank gauge may leak at higher pressures, and then stop. Don't think it's impossible - I've seen it.

And if no change, the switch is a possibility, though not very likely, given how they are usually designed. But if the gauges are OK, and the thing is under warranty, you might want to pursue that possibility and get it replaced.

Let us know what you find, please.

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