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[MW:7037] A-266 grade for Sour service

By Materials & Welding
Dear Colleagues

As per 32-SAMSS-004, table 1,general notes D states that " Material for vessels in environment specified in paragraph 12.2 of this specification with the normal operating temperature up to 150 deg C shall be in accordance of table 1 with the following revisions(there are many points one of them is below)
1) flanges above 24" should be SA-266 Grade 4
Paragraph 12.2 speaks about HIC requirement for sour service.

My query
1) Why is this special requirement for flanges only above 24"
2) The SA-266 is not listed in B16.5 then how it is written as SA-266 it is just an A-266 with Grades 1,2,3.4
3) Can some one forward me the A-266 & MR0103 specification as to know what is exactly written in it.
 

Regards

Thaksen




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