API 6A PSL3 Material Requirements

[aggiebpv]

Does anyone know if it is possible to qualify API 20th edition material to 21st edition? PSL3. I use mainly 4130 alloy and 17-4 HH1150. I am starting to see some material come up that meets 21st edition PSL3 but I am afraid the availability will be slim when November hits. Also, can someone explain the change in QTC from 20th to 21st edition? If I'm understanding correctly, the QTC jumps up a size for bars larger than 5"? Thanks in advance.

 

[Pau9mi]

Are we talking Casting, or forgings. I believe you can send material to be re tested, but i would guess you would have to prove its from the same heat lot, and batch and all that good stuff. Castings have a CSL level which is dictated by API-20A so that also has to be considered. As for are the QTC for PSL-3, i thought it was the E.R. had to do with the thickest wall not to exceed 5". Please correct me if i am wrong.

 

[Dinu Stan]

you can refer the following thread, the same has been discussed and you can find the variations....

https://www.eng-tips.com/viewthread.cfm?qid=451650

Dinu...

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