Re: [MW:29020] Interpretation available (IX-04-03)

Dear Friend,

Purpose of post heat is to DIFFUSE hydrogen after welding , for this purpose we hold our joint at 93-80 degree for 1 hour after completion of welding.

PWHT always Performed below Lower Transformation Temperature, PWHT and Post Heat is different things.

Kind Regards

On Tue, Jan 29, 2019 at 2:27 PM George Dilintas <dilintas@gmail.com> wrote:

Most propably your client wants you to perform a hydrogen bake-out treatment

Στις Δευ, 7 Ιαν 2019, 08:58 ο χρήστης muneebslsa@gmail.com <muneebslsa@gmail.com> έγραψε:

Hi All,
Client specification calls for post weld baking/heating (not stated as PWHT) of a P No.1 material after welding for a specific reason. Does it consider a PWHT condition as per ASME Sec IX QW-407.1(a) Point#2, i.e PWHT below lower transformation temperature? If it is considered as PWHT as per the clause above, then would a PQR with 200 Deg C PWHT qualifies to perform PWHT on the weld at 600 Deg C which is below the lower transformation temperature of P No.1 keeping all other essential variables same. Note: Though there is an interpretation available (IX-04-03), it doesn't state the answer instead it refers to QW-407.1 (throwing the ball away wisely).

Originally posted in Linkedin

by

Ishack Mohammed Ismail
• 1st
Technical Representative at ABS Consulting
4d • Materials-Welding

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Respected Sir,

Please find the enclosed file.

Bilal Arshad Wahla

P.W.H.T Engineer

SEPCO Electric Power Construction Corporation

Saudi Aramco JAZAN IGCC Power Block Project (EPC-4)

Jazan Economic City, KSA

Mobile: +966 591317207

Email: bilalwahla.047@gmail.com

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