2 stage air compressor not keeping up like it used to

by Mark
(Florida)

I have a 60 gal 5hp 2 stage air compressor rated somewhere around 15 cfm @90 psi it's not even a year old. Ran everything fine with no problems , could run die grinder continuously , my sandblaster @125 psi no problem. Now 2 minutes and the die grinder is down to 50 psi which won't cut hot butter and I can't use my sandblaster at all.What gives . She still pumps up pretty quick to 175 psi and cuts back in around 135 psi but has no staying power.

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Bill says...

Mark, just to be clear, before you could run these two tools continuously with no problem, and now you can't.

Before, the compressor tank pressure would drop to 135 PSI as you used the tool, the compressor would kick back on, and even though you were using the tool, the pressure in the tank would still get up to 175 PSI and cut off?

You see, I don't think that 15 CFM @ 90 PSI may be sufficient flow for your grinder or blast tank. What do the specs for these tools call for in terms of flow and pressure?

Since your compressor cuts out at 175 PSI OK, and cuts back in at 135 PSI, and fills back up to 175 PSI with no problem if you aren't pulling air from the tank, then, could it be that you are using the tools longer at one time, and this is what's doing it?

Anything else change in how you use air?

Bill