1948 Pressure Vessel Code
1948 Pressure Vessel Code
(OP)
I have to review the fitness of a carbon steel welded vessel constructed in 1948, no MDR is available for the vessel. A couple of the things I need to know to get the process started and I was hoping someone might have an answer to these questions:
1)The stated Tensile Strength of the carbon steel shell and head is listed on the nameplate as 55,000 psi, given that, the material of construction is possibly a SA285 Gr.C material (or perhaps SA283 Gr. C material I suppose). Anybody know what safety factor was in effect at the time the vessel was constructed? I recall it initially starting at 5 in the early codes, I believe they lowered it to 4 around the time of WWII. Did it go back up again after the war and then get lowered again around 1955? or did it stay at 4?
2)What radiographic joint efficiencies were in effect at this time? Looks to me like some must have been done in order to utilize the shell and head thickness they have used. Were there any min requirements in effect back then?
Thxs
1)The stated Tensile Strength of the carbon steel shell and head is listed on the nameplate as 55,000 psi, given that, the material of construction is possibly a SA285 Gr.C material (or perhaps SA283 Gr. C material I suppose). Anybody know what safety factor was in effect at the time the vessel was constructed? I recall it initially starting at 5 in the early codes, I believe they lowered it to 4 around the time of WWII. Did it go back up again after the war and then get lowered again around 1955? or did it stay at 4?
2)What radiographic joint efficiencies were in effect at this time? Looks to me like some must have been done in order to utilize the shell and head thickness they have used. Were there any min requirements in effect back then?
Thxs





RE: 1948 Pressure Vessel Code
Weld joint efficiency was either 0.90 or 0.95. The higher weld joint efficiency 0.95 was used if the weld reinforcement was removed and ground flush with the plate.
RE: 1948 Pressure Vessel Code
I knew there was something funky about the Weld Joint E back then. So was it .90 for 100% radiography on the seam? If they did spot what did they get 0.80?
In your 1952 code how did they treat a seamless head...did you have to the spot RT to get the full joint efficiency?
RE: 1948 Pressure Vessel Code
RE: 1948 Pressure Vessel Code
RE: 1948 Pressure Vessel Code
RE: 1948 Pressure Vessel Code