What is the minimum temperature of the metal during a pressure test of a 2.125" thick vessel?

What is the minimum temperature of the metal during a pressure test of a 2.125" thick vessel?
A . Minimum temperature shall be at least 20˚F above the minimum design metal temperature
B . Minimum temperature shall be at least 30˚F above the minimum design metal temperature
C . Minimum temperature shall be ambient temperature but not less than 55°F
D . Minimum temperature shall be 60°F

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Answer: B