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Post Welded Heat Treatment Of Air Cooler


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#1 m42364236k

m42364236k

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Posted 30 July 2014 - 01:27 AM

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



#2 Art Montemayor

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Posted 30 July 2014 - 07:54 AM

Mike:

 

As an old ex-welder, I never have attempted to do my own Post weld heat treatment on vessels or piping.  I have seen it done on my equipment many times and have witnessed it even more times.  I think I know how to go about stress-relieving the welded headers on an air-cooled exchanger - but I would not attempt or do it myself.  There are fabrication shops and technicians who do this type of coded work and they can do it in their sleep and guarantee the results.  With all due respect to your engineering ability, if you are new to this or have just "studied it", I would not trust you to stress relieve any vessels that I would be installing or operating.  This is not meant as a personal critique, but I would feel much safer going to a recognized, experienced expert who can do it, document it, and have it certified.  The monies you can save by doing it yourself, in my opinion, are not worth the risk.






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