What is the test pressure of a metallic piping system whose design temperature is above the test temperature using the following conditions? NPS 6, SA106 Gr.B, 100 psi / 800°F

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What is the test pressure of a metallic piping system whose design temperature is above the test temperature using the following conditions? NPS 6, SA106 Gr.B, 100 psi / 800°F
A . 150 psi
B. 450 psi
C. 278 psi
D. Test temperature verses design temperatures are not different

Answer: C