I was a Startup and Test Engineer at the Brunswick Nuclear Power Plant when it was built. One of my systems to check out and start up was the air compressors and systems. These were huge piston type compressors. Since they were built to be oil free to supply oil free air to the instruments in the Nuc Plant the compressors had teflon rings. Well, the plant was using more air than the designers calculated and these compressors were running a lot at a max discharge pressure of 125 psig. Continuously running at that pressure would get the discharge up to 460 degrees F. Since the maximum usable temperature for teflon was 500 degrees F, the compressors had to be rebuilt often. The compressors did not have a cooling system but there was a heat exchanger on the outlet piping to cool the air discharge. We had to add more compressors to the system to help with the air demand.
So, if your compressor was running continuously, it could have gotten really hot!