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Double check of MDMT assessment

Double check of MDMT assessment

Double check of MDMT assessment

(OP)
Just wanted to make sure I was performing this MDMT assessment correctly.  I have an exchanger shell that is made of ASTM A212 Gr. B made in 1963 (cannot verify fine grain practice). The shell and head are nominally 0.625" thick (0.5+.125 CA). I have a bolted tubesheet that is 3+5/8" thick. Using API 579 and ASME UCS 66 I get a governing thickness of about 0.90625 (vs 0.625) due to the tubesheet (1/4 thickness).  Therefore the MDMT at full pressure should be (curve A for both materials) 64 F?

The reason why I ask is because someone before me assessed it at 40 F (which is close to 44 F if 0.625 is the governing thickness.  Who is right?

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