Pressure issue on the back side of the heat exchanger seal weld
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If the shell-side pressure of the heat exchanger is 10 MPa, and the heat exchange tubes are connected to the tube sheet using a combination of strength welding and clamping, with a tube sheet thickness of 300 mm, what will be the pressure at the back of the seal weld (at the root of the seal weld) in MPa? What is the calculation method?
It is recommended that when using a composite tube sheet, in cases where there is a high pressure difference between the tube side and the shell side, the medium with higher pressure should be placed on the tube side; otherwise, the tube sheet surfacing process is advised.
It is unclear why you need to know the pressure on the back side of the seal weld; due to the use of expansion fitting, it is difficult to obtain accurate data on the pressure at that location even through stress analysis. I don’t think knowing the pressure at that location is of any use for heat exchanger design and manufacturing.