Nandesh,
Looking at your query, if the material of construction is P No/S No-1 then PWHT is mandatory over ¾” or 20 mm pipe wall thickness. This is the PWHT criteria as per B-31.3 -2008 code.
If the design code is not B-31.3 then PWHT requirements of the applicable design code will follow. Do you have impact requirements for LNG piping if so @ what temperature?.
If you could provide those details e.g. materials grade, SA 333 Gr1 or 6 , design code, design temperature more comprehensive answers could be provided.
Thanks
Pradip Goswami, P.Eng
88,Garth Trails Crescent
Hamilton,Ontario, L9B2X1,Canada
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Chandra, Vasanthan (Lagos)
Sent: Tuesday, January 26, 2010 5:19 AM
To: materials-welding@googlegroups.com
Subject: [MW:4151] RE: 4150] ASME SEC IX...PWHT?
Nandesh,
PWHT requirement is to be cross referred in line with Construction/Design code. In your mail, the applicable design code is missing. However, assuming the design code as B31.3 (2008) for piping, PWHT is mandatory for a thickness >20mm.
Regards,
Vasanth
From:
Sent: 26 January 2010 10:33
To:
Subject: [MW:4150] ASME SEC IX...PWHT?
| Dear All, For our LNG piping project, as per ASME SEC IX for a pipe 16 inch OD and Thk 21.44 mm PWHT is manadtory? We are welding root and hot pass TIG and others SMAW. Material is ASTM A333 . Thaks in advance Nandesh Kumar A |
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