Any limits on oxygen content before welding stainless steel to be put in highly corrosive service like ammonium carbonate?
If yes, then what are the available references to follow?

What exactly would you like to have a final layer chemistry, is that 347?
If yes, I would not say that 16-8-2 would get you that.
You need to have ER347 applied to achieve that.

You will get all you want here at the following link:
https://cstools.asme.org/CodeCases.cfm? ... TcxODM1NTI.

What are the basis of operating pressure value for a distillation tower?

Check Sec. 11 of API 577 and there exactly you will find this requirement listed.
That reference can be used in this particular case.

Ben, that was exactly what I was looking forward to better understand and implement. Qualification of a welding procedure with all essential variables is one thing. You see interpass temperature is not even an essential variables, won't force pre-qualification but it would significantly impact the ...

Correct, thanks.
Now what control should we be having in place?
Welder & company seems to be in a hurry to finish the welds and go.
We do not have dedicated QC team in place to monitor all this.
What do you recommend? We perform random testing ourselves, and let them re-do the welds?


Alright, got ...

One of the process safety event occured due to a valve could not be operated well in time just because F key was not available.
To address such an issue, what should be the consideration?

Thanks but in case if that is not complied with, what could actually happen, and how to then rectify?
Would non-compliance be detrimental?

My interest is towards the non-compliance of ensuring maximum interpass during welding of nickel alloys.
We are dealing with Inconel 625.