What is the working pressure of a 150 Ib. flange, SA 350 Gr.LF6 CL 1, used at 400°F?

What is the working pressure of a 150 Ib. flange, SA 350 Gr.LF6 CL 1, used at 400°F?
A . 230 psig
B. 200 psig
C. 170 psig
D. 140 psig

Answer: B

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