Flat cover of tube sheet without holes
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For such non-through holes in the tube sheet or flat plate, what is an appropriate value for the d value?
Keep it as needed; it can’t be too large, M6 is fine
For the tube sheet, if it is welded to the heat exchange tubes, the minimum weld angle height that can be determined through calculations can be used as a reference for this dimension.
What is quite similar is that the tie rod is connected to the tube sheet via threads; according to ASME UG-43, this connection requires a thickness equal to 1/4 of the calculated thickness of the tube sheet, plus an allowance for corrosion； Generally, we require that the depth of the threaded hole not exceed 1/2 of the thickness of the tube sheet ；