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Questions and Answers
Explain the basis for pressure vessel rerates according to the original code edition and the use of current code calculations for certain vessels or components.
Pressure vessel rerates are based on the Code edition to which the vessel was originally constructed, and the current code calculations may be used for all previous edition API-ASME, ASME Section VIII (pre D1), and ASME Section VIII D1 vessels or TEMA components.
What is the exception for rerates of riveted vessels, and how should they be calculated?
An exception is taken for rerates of riveted vessels, where the calculations must be done per the original code.
When can an exception be taken for original code joint efficiencies and allowable stresses, and who needs to approve it?
An exception may be taken if the requirements of API 510 paragraph 8.2.1 b) are met, and approval of the Owner’s Lead Mechanical Engineer is obtained.
Under what circumstances is it permissible to use the original code calculation instead of the current code calculation for rerates?
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What is the exception regarding flange rigidity calculations, and who can waive it?
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