Thursday, January 28, 2010

Re: [MW:4157] RE: 4151] RE: 4150] ASME SEC IX...PWHT?

Dear Mr. Pradeep,
 
Yes you are right. Please throw some more light on this issue
 
Material : ASTM A333 Gr. 6
Design code : ASTM B31.3
Service : LNG line
Impact requirement : yes @ -21° C
 
Thanks for the suggestions.
Nandesh

--- On Wed, 27/1/10, pgoswami <pgoswami@quickclic.net> wrote:

From: pgoswami <pgoswami@quickclic.net>
Subject: [MW:4156] RE: 4151] RE: 4150] ASME SEC IX...PWHT?
To: materials-welding@googlegroups.com
Date: Wednesday, 27 January, 2010, 3:48 AM

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

Email-pgoswami@sympatico.ca

Email-pgoswami@quickclic.net

 


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: materials-welding@googlegroups.com [mailto: materials-welding@googlegroups.com ] On Behalf Of Nandesh Kumar
Sent: 26 January 2010 10:33
To: materials-welding@googlegroups.com
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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