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How warm should a single stage compressor get?

R

Ryan - WI

Member
I picked up a 55 gallon single stage Devilbiss compressor about a month ago. The price was definitely right. The guy had moved and his new garage didn't have 220v.

Anyeay I got the circuit run to the garage and got everything wired tonight. It runs pretty well. Definitely needs anchored to the floor yet as it walks a bit. It ran from completely empty up to 120psi. It probably took about 6 or 7 minutes. Afterwards the tank itself was actually warm. Is that normal? I know the compressor head should be hot but didn't know if the heat should be so great as to cause the tank to warm a bit.
 
friction of the air molcues rubbing together (compression) creates heat, normal. single stage compressors utilize cooling fins and ambient air for cooling while two-stage compressiors utilize an intercooler. be aware, warm air is moisture laden and will condense when cooled and pool water in the storage tank which reduces space available for air storage, causes rust in the tank and potential problems for associated tools.
 
When a gas (air) is compressed it gives off heat. All of the air entering the tank was heated air so naturally the tank temperature will rise.
 
Those modern "Screamers" as I call them which run at 3600 rpm or whereabouts really cram the air through them...so they will have a respectable recovery time. Usually have a motor on them that reminds you of a one half horse power size of thirty years ago...and sometimes have the word "special" for the HP rating on the tag because the engineers were too embarrased to tell you that the 2 or 3 horse motor with a bunch of start/run capacitors on them has been stretched to it's limit to start the load even with an unloader on the compressor.
I have one and it gets hot hot, where you can't hold your hand on it. I don't worry about it, I just keep it clean so it doesn't have oily dust on it cause it gets hot enough clean. They'll run till they quit...my rotten opinion. (Sorry) ohfred
 
That's why air tools are so inefficient, most of the energy is wasted as heat, large compressed air systems have huge inter-coolers. It takes about a 5 hp compressor to run a 1 hp tool.
 
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