IR model 30T - PRV between cylinders blows at 50 psi

by Richard
(Cleveland)

I have an older IR model 30T 5HP compressor which has worked great for years. Yesterday, when filling the tank and the pressure in the tank reached 50 psi, the PRV between the low and the high pressure cylinders blew almost constantly. The compressor continued to run and would not build pressure above 50 psi. When shut off, the pressure in the tank drained completely out.

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Richard, I would suspect the intake valve on the second cylinder is failing, or has failed. It's preventing the air from flowing into the second cylinder, back pressuring the line, and popping the PRV, assuming that 50 PSI is the normal blow off for that PRV.

Cheers,

Bill

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EP-50Se builds varying pressure in morning. Maybe 6psi or 40 80 who knows. i have another one to back it up. So here is the odd part. If i let the other compressor build the system up to pressure i can shut it off and turn the other one on and it will cycle all day no problem. I replaced the pressure transducer and it made no difference.

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Bill says...

To help those folks that are IR conversant to help you, maybe you could post, as a comment here, how the two air compressors are plumbed into the air mains.

In particular, do you have a non-return or check valve in the outflow of the two air compressors, before their lines join?

Cheers,

Bill

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airend temp alarm

Changed air filter, cleaned pacckage filter, cleaned oil cooler.
air end still over heats . airend replaced by Ingertsoll-Rand 10/2011.

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