Hardness after PWHT
Hardness after PWHT
(OP)
Where can I find the requirements for hardness testing of vessels after PWHT and/or the maximum hardness values of various metals typical to pressure vessel fabrication (P4, P5 etc..)
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RE: Hardness after PWHT
RE: Hardness after PWHT
RE: Hardness after PWHT
RE: Hardness after PWHT
Absolutely it is reasonable to ask that. But these type of requirments are typically spelled out in the Purchase Order stage.
Also, look to API 582, API 934, and Nace MR0175 for hardness requirements for P-No. 4. Usually, it is 225 BHN Maximum.
RE: Hardness after PWHT
RE: Hardness after PWHT
(Personally I believe Brinell should be confined to foundries.)
RE: Hardness after PWHT
The 'Main Event' is the chart from a calibrated chart recorder hooked up to the PWHT thermocouples. If you have *any* doubts about the veracity of the PWHT contractor, you need to have your in-house QC or Eng take the Brinnell readings. Hardness readings are much easier to fake than a chart recording.
RE: Hardness after PWHT
Thanks
RE: Hardness after PWHT
I was not considering cross sections, just measurements on the PV.
I have also found through my own informal lab trials that conversion via E140 is not very 'accurate'. I always preface reported results with 'approximate equivalent values'.