-20degF Vessel for PED
-20degF Vessel for PED
(OP)
I am redesigning a small vessel for use in Europe at -20F (-29C). Currently it is made of SA53B,E shell, SA414G heads, SA36 machined nozzles. My understanding is that these materials cannot be rated -29C in Europe without impact testing. But I understand that I can achieve -29C if I switch to SA524 shell, SA516-70 (normalized) heads, and SA516-70 (normalized) machined fittings AND FOLLOW THE FOLLOWING STEPS:
1) Limit carbon content to .23%, Phosphorous to .035%, Sulfur to .025%
2) Employ Fig UCS-66 to show -55F at 20J impact
3) Adjust to 27J using API579
I would appreciate hearing comments on how sensible this plan is, and if there are better material choices than I gave.
1) Limit carbon content to .23%, Phosphorous to .035%, Sulfur to .025%
2) Employ Fig UCS-66 to show -55F at 20J impact
3) Adjust to 27J using API579
I would appreciate hearing comments on how sensible this plan is, and if there are better material choices than I gave.





RE: -20degF Vessel for PED
RE: -20degF Vessel for PED
make sure all materials come from ped certified sources.
make sure a ped certified lab does all tests.
make sure your nde contractors are ped certified.
make sure that your weld procedures were or will be witnessed by the PED certifying person.
RE: -20degF Vessel for PED
Not sure if thats your case here, but since u're talking bout redesigning I thought I just mentioned.
As vesselfab indicated, you might want to ask for 3.1 certificates as per EN 10204.
Also, make sure your material is 'PED approved' (Annex I 4.2 (b)), which might require a PMA,
as ASTM material isn't a harmonized standard for the PED.
It might also be useful to read PED guideline 7/17 about when a material requires impact testing per PED (it's not always required).