pressure relief valve for compressed air inside a NEMA 4 enclosure ?

[DanW 41]

The panel under consideration has a compressed air supply of 120 PSIG which runs through some Parker N 1/2" OD nylon tubing rated to 250 PSIG.  Parker Prestolok Push-to-connect tube fittings are used throughout.    

Should one of the tubes fail or the seal on a push-to-connect fitting fails, the supply air would leak out and fill the panel.  I assume that that door gasket would leak at some point, probably leaking at the same rate as the 'fault' or the door gasket would tear, opening a gap that exhausts/vents the pressurized air from the enclosure.  But this is speculative on my part.

Is it a standard practice to install a relief valve to open and vent compressed air in the event of a air component failure inside the panel?

[pturmel 157]

The door will deform, breaking the seal.  I've never seen a relief in practice.