I've been running a pipe stress analysis on a system connecting to an API 661 air cooler and have not been having any luck. I think what it comes down to is that I don't have the correct boundary conditions modeled for the nozzles. I attended a Webinar yesterday that talked a bit about modeling boundary conditions in Caesar and this topic was touched on, but I was hoping I could find someone that might be able to describe it to me in more detail. I've tried a number of things from calculating the stiffness of the nozzles as if they were cantilevered beams to various combinations of rigid elements made to simulate the cooler itself. Any thoughts would be appreciated. Thank you.