Determination of the design pressure for the shell side of the heat exchanger
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Recently, I came across a set of drawings in which the technical specifications only provided the operating pressures at the inlet and outlet of the shell side. How can one determine the design pressure for the shell side? Please ask an expert for help
If it is not a tube-type high-pressure heat exchanger, the design pressure shall be determined using conventional methods (refer to HG/T20580-2011 P14). If the tube side pressure is high (e.g., 14 MPa), the shell side pressure is generally set at 0.7 times the design pressure of the tube side.
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Why is the pressure in the tube side high, while the design pressure for the shell side should be 0.7 times that of the tube side? Please explain, thank you.
Please check TEMA; there are instructions there. However, in the heat exchanger we designed, the pressure on the shell side of the threaded locking ring is increased to match that on the tube side, mainly as a precaution in case the heat exchange tubes rupture. If there are reliable relief protection measures in the shell side, it is not necessary to increase the pressure on that side; this requires a comprehensive cost comparison to find an economical solution.
If, in a fixed-tube-sheet heat exchanger, the operating pressure on the tube side is higher than that on the shell side, how is the design pressure determined?
I rarely encounter high pressures in the shell side here, so it’s sufficient to simply use the values specified in HG/T20580