Dear,
You can explain him that even as per ASME SEC VIII DIV 1, the impact requirement is
for heavy thickness i.e above 13mm as per UCS 66 (refer the graph A,B,C,D) at MDMT o degree.
The reason is that during welding the chance of changing in grain structure is more in heavy
thickness as compare to low thickness.
Regards,
Zakir Ali.
From: "Materials & Welding" <materials-welding@googlegroups.com>
Sent: Sun, 02 Oct 2011 03:53:52
To: "Materials & Welding" <materials-welding@googlegroups.com>
Subject: [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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