Toughness required PQR, technical justification
Toughness required PQR, technical justification
(OP)
Can someone explain the technical justification for limiting the wall thickness for ASME IX procedures when toughness testing is required. I understand it being a supplementary variable. With that, why does API 1104 not require this restriction.
Thanks
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RE: Toughness required PQR, technical justification
RE: Toughness required PQR, technical justification
RE: Toughness required PQR, technical justification
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: Toughness required PQR, technical justification
In terms of the 5/8" minimum limit, it was instituted in the 1974 Edition. There are conflicting theories behind its imposition; one was that Section III (also fully revamped in 1974) only required impact testing above 5/8", so it was driven by the nuclear industry. The other is based on transference from 2 dimensional cooling to three dimensional cooling during normal welding conditions, so it was linked to heat input.