What is the jointed materials Pnos?
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Original Message
From: Karunakaran Karan
Sent: Τρίτη, 22 Σεπτεμβρίου 2015 - 17:26
To: materials-welding@googlegroups.com
Reply To: materials-welding@googlegroups.com
Subject: Re: [MW:23504] Governing Thickness for PWHT(B31.1&31.3)
Dear Gents,
What is the minimum thickness for PWHT in revision 2014.
Pl.guide me.
Thank you
karunakaran
On 9/22/15, george.dilintas@gr.bureauveritas.com
<george.dilintas@gr.bureauveritas.com> wrote:
> For one more time I recommend to read all the relevant chapter of the Code
> and not isolated paragraphs.
> So I would like to draw your attention also to the following paragraphs
> 132.1.2
> 132.2 (B)
> and to 132.4.2
>
> best regards
>
> Dr. Georgios Dilintas
>
> Authorized Nuclear Inspector
> Authorized Inspector Supervisor
>
> I&F REGIONAL TECHNICAL MANAGER
> BUREAU VERITAS PIRAEUS - GREECE
>
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Hi, You are correct, Minimum refers to the one cycle for which this part will expose until final work shop PWHT. hence mill test certificate shall include this. Max. SPWHT, refers to additional cycles of heat treatment that are reserved for future repairs during equipment lifetime. Again, these simulated no. Of cycles shall be specified in MTC. The idea is we need to make sure that steel mechanical properties are not compromised upon exposure to multiple repairs (i e 4 cycles in your case). One could say, if steel is subjected to 4 cycles and is ok, then it should by defacto be good for one cycle, yet, this is wrong assumption cause mechanical problems and microstructure of materials varies accordingly based on no. Of cycles for which material will expose. This is apparent in alloy steel and especially for impact test values as an example. In your case, this forged CS with properties before PWHT can be understood to be " as forged" condition (i.e. Wit...
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