How to simulate the stress on the heating furnace tubes without knowing the support conditions of these tubes
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Help, please! I’m working on a project that requires an upgrade of the material used in the process pipelines at the inlet of the heating furnace. However, since the furnace was built in the 1970s, the internal furnace tube diagrams are not available, so it’s impossible to simulate the internal conditions. Is there any way to determine, in a conservative manner, whether the stresses on the furnace nozzles are within acceptable limits? The furnace tube is of Cr5Mo DN125 type, while the pipe is 321 DN200. Is it possible to fix the nozzles in place and apply a force equal to five or three times the value specified in API560? Also, since the diameter of the process supervisor is larger than that of the furnace tube, I plan to reduce the diameter of the pipe to that of the furnace tube after the inlet manual valve, thereby indirectly reducing the stress on the burner. Is this a viable approach? I need an expert to help me, please save me!
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You don’t know the exact path of the internal pipes, but you should be able to determine the general direction of the forces. At this point, simulate it as a fixed point and check the direction of the forces; if it’s opposite to that of the furnace tube, then it’s not conservative, while if it’s in the same direction, then it is conservative.