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PWHT maximum soaking time?

PWHT maximum soaking time?

PWHT maximum soaking time?

(OP)
Is there any limit for maximum soaking time during PWHT as per construction code or Metallurgy.
Say example LTCS P number:1, A333., construction code B31.3 process piping.
There is minimum soaking time limit as per construction code , but what about any maximum any limit on maximum soaking time?
Replies continue below

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RE: PWHT maximum soaking time?

No limit
See ASME B31.3 2020

Regards

RE: PWHT maximum soaking time?

Limited by welding procedure qualification time when impact test qualification required per ASME IX.

RE: PWHT maximum soaking time?

Agree there is no limit per code, unless impact tested.

Maximum soak time is typically addressed in a PWHT procedure, usually specified as an exact time with limits.

Example: SA-333 Gr 6, 6" STD, PWHT for 1 hour +15/-0 minutes

The devil is in the details; she also wears prada.

RE: PWHT maximum soaking time?

IMO it is limited by Engineering Judgment, which is mandatory in the ASME Code. Besides, more PWHT time costs.
The highest I have seen is 20 hours for nuclear steam generator pressure boundary material. The justification is to qualify multiple weld repair and re-PWHT events that might happen in future.
I can't think of other pressure equipment that could require anything near that time.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

RE: PWHT maximum soaking time?

@ DVWE
Please, can you check "Example: SA-333 Gr 6, 6" STD, PWHT for 1 hour +15/-0 minutes" ?

NPS 6 STD t= 0,28"
Table 331.1.1 says 1 h/25 mm (1 hr/in.); 15 min min.
This represent a linear ratio, then holding time is 17 minutes

Also I see that table 331.1.1 says P-No. 1, Group Nos. 1–3 , (and group 6 ?). This is an error because it does not match the ASME IX tables. I don't know what happened at ASME.

Regards

RE: PWHT maximum soaking time?

r6155,

My post was only meant to show an example of a maximum PWHT time as I’ve seen them in production and in various PWHT procedures.

I see a lot of customer specifications and other industry practices that require 1 hour minimum PWHT time for carbon steel materials and my example was also based on that. So in other terms: “1 hour minimum, 1 hour and 15 minutes maximum”. This gives the furnace operators a viable range to work with.

Also note in my example “Gr” means “grade” in this case, not to be confused with “group” as listed in ASME IX. SA-333 Grade 6. It’s quite a commonly used material in the pipe fabricating industry.

The devil is in the details; she also wears prada.

RE: PWHT maximum soaking time?

@ DVWE
Forgot to see APPENDIX A in B31.3
My apologies.
Thank you !

Regards

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