The following definitions relate to pressure, compressed gases, and compressed gas cylinders. The ASME rates boilers which operate at more than 15 psi as high-pressure boilers. For accident prevention purposes, any pressure system must be regarded as hazardous. Frangible Disk is a thin piece of metal in a pressure system to relieve excessively high pressure.
Fusible Plugs are fittings with an alloy that melts at a predetermined temperature.