Paragraph 323.2.2 (b) ASME B31.3

[mmmiscs]

with the 6 inch NPS SCH 160 (18.26 mm in wall thickness) ASTM A106 Grade B pipe example, to ASME B31.3, following the Paragraph 323.2.2 (b) and then referring to table A-1 this material is curve B, go into Fig. 323.2.2A, please correct for my understand under the as following cases:
#1: if the minimum design temperature is -20 degree C, so a design minimum temperature & thickness combination is below the Curve B, it seems that impact testing of base metal would be required.
#2: if the minimum design temperature is -5 degree C, so a design minimum temperature & thickness combination is above the Curve B, it seems that impact testing of base metal is not required.

 

[nickelkid]

I think you got it

 

[mmmiscs]

thank nickelkid so much, just one clarification more, if minimum design temperature is -30 degree C, obviously the impact test of base metal is required but how about impact requirement of weld metal when i fabricate this pipe?

The same question with regarding to #1 about impact requirement of weld metal?

 

[nickelkid]

yes, see table 323.2.2, A-3