5 Questions
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?
It is permissible to use the original code calculation when the current code calculations cause the rerate to fail, but the original code calculations allow the rerate to pass.
What is the exception regarding flange rigidity calculations, and who can waive it?
An exception is taken for flange rigidity calculations, but it shall be calculated per the current code for all girth flanges unless waived by the Owner’s Lead Mechanical Engineer.
Test your knowledge on pressure vessel rerates and the relevant code editions. Understand the guidelines for calculating rerates based on the original code and exceptions for specific vessel types.
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