NBBI Pressure Equipment Inspector (PEI) Practice Questions - NBBI Pressure Equipment Inspector (PEI) Certification Exam

What is creep damage, and at what approximate temperature does it become a concern for carbon steel?

Mechanical wear — occurs at all temperatures Time-dependent plastic deformation under stress at elevated temperature — becomes significant above approximately 700-750 degrees F for carbon steel Chemical corrosion — occurs below 200 degrees F Fatigue cracking — occurs only at cryogenic temperatures

Correct Answer:

Time-dependent plastic deformation under stress at elevated temperature — becomes significant above approximately 700-750 degrees F for carbon steel

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