Please read the previous posts by using search tool located on above right. Use such keyword "cooler" for example. For The allowable please refer to API 661; 6.1.10-Maximum Allowable Moments and Forces for Nozzle and Headers. Pay attention also to the para. 6.1.10.3 if you have one multi-bundle bay. You can also use module under main menu: Analysis >> API 661.
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Many thanks & regards,
Sam Manik