What is the Pipe wall Thick that require to start using PWHT

[tarekdata]

Dear API std specialist.

According to API 1104 , which pipe thickness tiger " threshold " starting Post welding heat treatment.
Thanks
Tarek

 

[jte]

Hi Tarek-

API 1104 is available at

http://www.techstreet.com/api/products/1863960

Perhaps you will consider purchasing the standard which you seem to be using for your engineering or fabrication activities. That way, you will have it available as a ready reference.

 

[LittleInch]

It's nothing to do with 1104 - it's to do with what the procedure requires which in turn, as a minimum, is what the design code requires.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[weldstan]

API 1104 does not provide the info regarding the thickness mandates for PWHT. B31.8 and B31.4 do.

 

[Inspectoriam]

1 1/4" is the thickness requireing PWHT within ASME B31.8 Gathering systems, this is the same as ASME B31.4