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Discussion Forums - The Hendrix Group
HomeHomeDiscussionsDiscussionsMaterial Select...Material Select...Post Weld Heat treatment requirement of low alloy steelPost Weld Heat treatment requirement of low alloy steel
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11/20/2004 9:00 AM
 
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We had a failure in one of our boilers. The failure was a crack at the HAZ of the weld joint of super heater coil with stub end of Super heater header. The metallurgy of coil was P22 and that of stub was P12. The joint was not stress relieved as the dia was only 1.5 inch and thickness was less than quarter inch. There was no internal or external corrosion. This joint was outside the furnace box. Whether absence of PWHT will cause such a problem? Is there any standard which requires PWHT for the above mentioned combination?
 
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11/20/2004 9:00 AM
 
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Sathyan: ANSI B31.3, Piping for Chemical Plant and Refinery Service does not require a PHWT for <13 mm thickness piping, but it does require a 350F preheat. I do not know what B31.1 (Boiler Code) requires. David Hendrix The Hendrix Group Inc.
 
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11/20/2004 9:00 AM
 
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Dear Mr Hendrix, Thanks for the response. Your observation is correct. In refinery we follow B31.3 for process piping. Sice we are in India, for Boilers it is Indian Boiler Regulations. IBR also does not call for PWHT for the case mentioned. I am looking for other codes or the requirements in other countries Sathyan
 
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12/26/2004 9:00 AM
 
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THE REQUIREMENT OF B31.1 IS ALSO SAME. (ALL OF THESE: t<13MM, C<0.15 AND MIN. 150 C PREHEAT) YOU HAVE TO WATCHOUT FOR HIC TYPE OF FAILURE DUE TO HARDENABILITY OF THIS MATERIAL AND POSSIBLY DAMP CONSUMABLES.
 
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