Compressor gets hot and blows line

[Al Skierkiewicz]

Does the tubing pull out of the compressor or does the line fail by producing a bubble and then blow out at the soft spot?
If it produces the bubble then the compressor is likely running continuous for several minutes (~10 or longer). It sounds like the high pressure relief valve is not calibrated. This is supplied uncalibrated and needs to be adjusted by the team to release at 125 psi. A compressor that runs for an extended period will blow out the line. It does this by heating the tubing to a temperature where it fails under pressure. To calibrate, loosen the locking ring on the valve, it is the lower hex hardware on the valve. Then power the robot and enable, short the pressure switch which should run the compressor continuously. With an accurate pressure gauge on the high pressure side, watch for the pressure to rise to 125 psi and listen and feel for air escaping the top of the valve. If it does not, turn the top counter clockwise until air is vented from the valve. If air is released at a lower pressure, then turn the top clockwise until 125 psi is reached when it vents. Tighten the locking ring without letting the top of the valve rotate. Remove the short across the pressure switch and see if the compressor shuts off when the pressure reaches ~120 psi.

If it simply pulls out of the fitting, one of two things are occurring. Your gauge is not accurate and you are exceeding 150 psi and failing at the fitting. Or the fitting could be bad and not securing the tubing. Once inserted you should not be able to pull out the tubing without pressing the release ring first.