Friday, September 30, 2011

[MW:12590] CVN Impact test on 304L 2.77mm thick B31.3 piping

Please I need your assistance:-

I have Helium gas Pipeline 304L to be welded by ER308L ,having MDMT at
-269 Degree Centigrade , but the thickness of my Pipe is 2.77mm ,
Which is exempted from the impact requirements from B31.3 Chapter-III,
Table323.2.2 Column B, B-4, Notes -6, Impact test are not required
when maximum obtainable charpy specimen has a width along the notch of
less than 2.5mm.
but my client is not ready to accept that condition/constraint of
B31.3. he needs explanation that How the material thickness(2.5mm)
will bear that MDMT at -269 Degree Centigrad., even Obtainable charpy
specimen is not possible, but How to convince the client the material
will have the properties at that temperature.

Thanks & Regards
Posting on behalf of: Amit Pahuja

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