Post Weld Heat Stress on A 212-B Carbon Steel
Post Weld Heat Stress on A 212-B Carbon Steel
(OP)
thread177-29735: ASTM A-212-B Firebox vs. ASTM SA515 and SA516 I would appreciate any info. I can get on means and methods for post weld heat stress of A 212-B Carbon Steel 1962 Vessel. Vessel was use for Amine service and is now going to sour water with same design pressure of 390 PSI,although operating pressure will be only about 60 PSI. Heat the entire vessel,certain sections at one time? Or only certain welds in groups? NDE crew wants to of course heat entire vessel. Please advise. Vessel has many full pen welds with tig process and galvanized steel platform welded on top.Carbon content 31%. Would a charpy v-notch test help decide issue? Meeting tomorrow. Need something to bring to the table. Literaly.





RE: Post Weld Heat Stress on A 212-B Carbon Steel
Doing an entire vessel could result in distortion to the vessel, nozzle attachments and external supports. I would remove the galvanized steel platform for PWHT, and re-install.
RE: Post Weld Heat Stress on A 212-B Carbon Steel
RE: Post Weld Heat Stress on A 212-B Carbon Steel
By the way, you can get more distortion by doing the entire vessel if it is not supported with internal bracing.
Heating methods - gas furnace, electric furnace, PWHT in circumferential ring sections can be by resistance heaters.
The reason I mentioned about the platform is that if it is galvanized as you indicated, you will melt the zinc coating and create a real mess with harmful vapors!
RE: Post Weld Heat Stress on A 212-B Carbon Steel