PWHT must be performed by certified experts with experience in this field-

The portion exposed to PWHT must be covered properly to protect it from rain or wind-

A hardness test must be performed to check if Post weld heat treatment is successfully performed-

Some metals and alloys can experience cracks during PWHT. Therefore, the alloy system must be taken into account-

Thermocouples are used for monitoring PWHT to assure heating rates, cooling rates, and hold temperature is within standard specifications. Along with thermocouples computer software is used to provide  documentation about PWHT