Re: [MW:32993] PWHT of blind flanges not having welding

Agreed the PWHT is done for welding, however it is good engineering practice to have all part of equipment undergoing same heat treatment for uniform micro structure across all parts especially very good to practice this for equipment having NACE & sour service.

Even blind flange will come in contact with service fluid during process.

Discussed this case with many AI & all have same opinion, however do not find any code restrictions. 

Also to be noted, we do local SR for some weld due to various reason.

On Mon, Feb 28, 2022, 14:20 Gerry Lourens <Gerry.Lourens@newage-eng.com> wrote:

No Welding thus PWHT not required

 Kind Regards

Gerry lourens

Regards,
Gerry Lourens Welding Engineer
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On Mon, Feb 28, 2022 at 10:33 AM Muhammed Ibrahim PK <ibratech@gmail.com> wrote:

Gentlemen,

Please advice PWHT required or not for small blind flanges also if the vessel is in sour service.The blinds having no welding on it.

As per my understanding PWHT is only for weld, not for base metal.

If welding on blinds like davit, manway handle can be justified. Is it required for other blinds not having any weld on it.

Experts please provide your view on it.

Reg,

Ibrahim

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