Tube sheet calculation
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For SW6 calculation of the tube sheet, with all other conditions remaining unchanged and only the connection method between the heat exchange tubes and the tube sheet being altered – seamless expansion joint/slotted expansion joint/strength expansion joint with sealing weld – the result is |: Design calculation failed; select an expansion joint with lower stiffness. Welding was successful – why?
This post was last edited by jia717 on 2010-7-2 21:20. As specified in GB151, for expansion jointed connections, the required pull-out force is very low; the allowable pull-out force during welding is 0.5 times the allowable stress of the heat exchange tube at its design temperature.
Reply to 2# cn598: Which page exactly? Thank you
The temperature difference stress is too high, and the tensile resistance is insufficient
Reply to 3# MoMo, Table 26 in 5.7.5 of GB151
If conditions permit, reduce the temperature difference between the tube and shell sides. If the temperature difference cannot be changed, install expansion joints on the housing. It can be calculated as passing.
The recommendation to install expansion joints is usually due to a large temperature difference at both ends; either the process parameters need to be adjusted to change the temperature (which is generally not feasible), or the type of heat exchanger needs to be changed. However, installing expansion joints is basically the option with the lowest cost