ASME UCS-66 Assignment of SA387 Gr. 11
ASME UCS-66 Assignment of SA387 Gr. 11
(OP)
Hi,
the way I interpret UCS-66, SA387 Gr. 11 is assigned to the A curve for impact exemption. Some pressure vessel fabricators have been interpretting UCS-66 as saying that this should be on the 'B' curve. Are they right?
the way I interpret UCS-66, SA387 Gr. 11 is assigned to the A curve for impact exemption. Some pressure vessel fabricators have been interpretting UCS-66 as saying that this should be on the 'B' curve. Are they right?





RE: ASME UCS-66 Assignment of SA387 Gr. 11
It is clear that if FG & N it is a curve B material, per note (b)(2). It is not so clear that any particular piece of plate is FG & N however. I don't have SA-387 handy at the moment to see if grain size is specified, however I believe it allows normalization.
Most often, the customer specifies -20 MDMT or lower so you impact test all of it anyway.
Regards,
Mike
RE: ASME UCS-66 Assignment of SA387 Gr. 11
Unless SA 387 plate is specified as fine grained and normalized, it falls under Curve A category.