Dear sir,
Irrespective of the Pressure ,temperature, thickness and usage conditions, PWHT is made mandatory in our site
(client : NTPC, Manufacturer : DOOSAN)
Only proper PWHT Can ensure the required austenite structure which is primarily responsible for the characteristics of P91 Material.
Also type of heating : Resistance or induction is to selected carefully.
In our site upto 15mm resistance method and above 15mm induction method is used.(refer attached model chart for P91 for reference)
M.SRINIVASAN
QA/QC
L&T-SIPAT
From:
Sent: Tuesday, September 27, 2011 11:34 AM
To:
Subject: [MW:12547] RE: 12545] PWHT Requirement for SA 335 P91 (or P no. 5B Group 2)
Dear Sir,
From my understanding and experiences , P91 always need PWHT after weld for most of the cases.
If I am not wrong , now P91 should be classified to different P No. ( P15E ??? ) , please check from the most updated ASME IX.
Regards,
C.Nopadon
From:
Sent: Tuesday, September 27, 2011 12:12 PM
To:
Subject: [MW:12545] PWHT Requirement for SA 335 P91 (or P no. 5B Group 2)
Dear experts!
Project : Solar Power Plant
Construction Code ASME B31.1
ASME Sec IX
PWHT Requirement - SA 335 P91 or P no. 5B Group 2 material is not included in 132 Para and Table of B31.1, and also,
ASME Sec IX para QW-407 do not mention this material group.
Client Specification do not mention this requirement separately
Please advise! do we need to go for PWHT ?
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