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PWHT a API650 modified tank

PWHT a API650 modified tank

PWHT a API650 modified tank

hi, we are building a caustic 50% storage tank. client asked us to do a PWHT on the whole tank. how do we analyze when tank is heated to 1150 deg F, the plate property change? tank floor is 3/8" THK, shell is 1/4" THK, roof is 3/8" THK, we will be using G40.21 38WT plate. thanks in advance

RE: PWHT a API650 modified tank

littlefish2003, I'd expect no meaningful property changes in carbon steel, but I'd be concerned about distortion of the tank, depending on dimensions.

You might be better off in this forum: forum1452: Storage tank engineering



The problem with sloppy work is that the supply FAR EXCEEDS the demand

RE: PWHT a API650 modified tank

Dear littlefish2003,

PWHT of the whole tank means PWHT of all the weld joints of the tank. If you think distortion could be an issue, you may go for localized PWHT. Of course, it has to be economical too, as it would take more time for sure.

Tanks fabricated at site are locally PWHTed only.

Choice is yours.


Kolkata, India

RE: PWHT a API650 modified tank

Consider to have a PWHT of the whole tank in the furnace, if fitted, for a better temperature control through the heat treatment process, and avoid the potential thermal stress caused by the local PWHT process.

RE: PWHT a API650 modified tank

How large is this tank?

RE: PWHT a API650 modified tank

the requirement for PWHT is to avoid caustic embritlement. I suppose it is a small tank. If possible the tank shall PWHT as an all in a fournace. Care shall be taken with provisory reinforcements to avoid distortions.


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