Maya shook her head slowly. “Close. But no. I’m worried about lamination tearing due to shell deflection during filling and emptying. The old API 653 didn’t emphasize cyclical fatigue on laminations. The updated one does. You just missed a critical safety flag.”
Answer: Corrosion allowance = 0.2*15 = 3.0 mm. Use fabrication min 6 mm → recommended thickness = 6 mm + 3 mm = 9 mm.
A form of hydrogen embrittlement that occurs under the joint action of tensile stress (residual or applied) and a corrosive environment containing H2Scap H sub 2 cap S
: Discuss the necessity of PWHT for stress relief after welding.
Experienced engineers must also be familiar with inspection methods and maintenance strategies.
Q: Define design pressure, design temperature, and MAWP. How do you apply corrosion allowance? A: Design pressure/temp are the conditions used for sizing components. MAWP (maximum allowable working pressure) is the highest pressure allowed at the top of the vessel at design temperature per code and construction. Corrosion allowance is an extra thickness added to account for expected material loss over service life; select based on corrosion rate, inspection/inspection intervals, and criticality.
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