ASME SEC IX...PWHT?
Nandesh Kumar
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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Chandra, Vasanthan (Lagos)
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
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A D
Hi Nandesh,
For PWHT requirement detail is not given in ASME Sec IX, it is required based on construction code and Client specification.
As per ASME B31.3 , generally PWHT required for A333 Gr.6 is above 20 mm thk, but based on service fluid it will be higher requirement than code.
In my previous shell project some services requirement is 100%.
Louis
Singapore
--- On Tue, 26/1/10, Nandesh Kumar <nandes...@rocketmail.com> wrote:
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pgoswami
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
Nandesh Kumar
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.
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rajagopal kannan
Thanks and Best regards,
mohammed faisal ahmed shareef
George Dilintas
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