Dear all
I have studied post weld heat treatment and I know this is a method for reducing and redistributing the residual stresses in the material that have been introduced by welding.
For vessels and pipe we use a furnace to increasing the temperature but my question is about the air cooler. We want to do the air cooler PWHT for the headers by increasing their temperature up to 500 oC (PWHT for welding the tube to tube sheet) we can’t put the air cooler in the furnace because the tube fins are not designed for this high temperature. Does any one know any method to increase the header temperature up too 500 oC or does any one have experience or document design practice about the PHWT for an air cooler or heat exchanger?
thanks in advance
mike