Cracks in compressor parts usually point to fatigue, overpressure or thermal stress. Identifying the crack type helps decide between repair and replacement.
Fatigue Cracks
Repeated cyclic loading creates fatigue cracks at stress points such as welds, threads and sharp corners.
Thermal Cracks
Repeated heating and cooling can crack cooler headers and valve parts.
Overpressure Damage
Operating above rated pressure can deform and crack vessels and piping.
What to Do
Stop the machine, relieve pressure and have the part inspected by a qualified technician before deciding to weld or replace.