Hi all, I have come across a spec that requires PWHT based on material grades (P-Nos), regardless of thickness. This is likely to give distortion problems when welding thin components (1/8in or similar) made of F22. On the other hand, we risk failing the hardness test, if we try to qualify...
I agree with the other replies. For steels with a Cr content greater than 9%, failures due to stress corrosion cracking have been reported for as-welded components waiting to be postweld heat treated after welding (even if no load was applied!). However, if PWHT will be immediately carried out...
I have been asked for information on how to calculate the MPT (Minimum Pressurizing Temperature) for a hydrocracker heat exchanger.
Can anyone suggest provide an ASME B&PV reference or any other relevant standards or publications?
A design report I got hold of references a conference paper...
Albaweld,
I agree with the earlier posts, developing your own template and actually reading the codes/standards is 'free' and it is the best way to learn your way around them.
Software programmes will not replace an individual's knowledge and most of all they will not 'write a WPS for you'...
Thanks Metengr, one of the publications I quoted was actually the EPRI Guideline (my CSEF bible). I have the 2007 version though (the one that was downloadable for free!).
The welds are being made for R&D purposes, so I will purge as I would not like root defects to influence the test results.
I am preparing some welding procedures for T23 tubes (7 to 15mm thick). This grade is a first time for us, although we have welded low-alloy grades before (91 and 92).
Is back-purging required for root runs in T23? I have found publications that recommend purging root runs for any low-alloy...
Thanks BigInch, I have come across the second document. They are useful but still do not answer my question, as what I refer to is distortion due to solidification shrinkage during welding.
The 'distortion' mentioned in the second link (and also in B31.3, 335.1.1(a)) refers to deformation of...
Hi everyone, I am looking for an international standard that provides requirements regarding acceptable distortion in piping (B31.3 does not).
Can anyone help?
Thanks metengr, I am trying to work out costs for those shops that carry out preheat and PWHT directly, without subcontracting. I have split between flame and resistance and I have calculated the cost of gas/electricity, but labour depends on too many factors (especially for blanket heating.)...
Dear All,
I am a welding engineer working on a spreadsheet to estimate fabrication cost. Whilst the cost of welding alone is 'relatively easy' to estimate (considering duty cycles, labour costs, equipment depreciation etc), I am struggling with the cost of preheating.
I have found formulas in...
Dear All,
I am a welding engineer working on a spreadsheet to estimate fabrication cost. Whilst the cost of welding alone is 'relatively easy' to estimate (considering duty cycles, labour costs, equipment depreciation etc), I am struggling with the cost of preheating.
I have found formulas in...
I have found information in AWS D1.1 (various paragraphs, see 'plug welds' in the index) that defines hole sizes, shapes and spacing as well as weld size but I do not know the background.
Doies anyone know of other International/National standards that provide guidance on design/execution of...
I have found information in AWS D1.1 (various paragraphs, see 'plug welds' in the index) that defines hole sizes, shapes and spacing as well as weld size but I do not know the background.
Can anyone help?
