Weld coefficient of the circumferential weld joint between the fixed tube sheet and the shell
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May I ask, does the circumferential weld joint mentioned in clause 4.6.4 of the \"Heat Exchangers\" refer to the joint shown in the diagram? Does the cylinder here need to be thickened?
Set the value on the left side of the welding coefficient to 0.6； Press 0.85 or 1.0 on the right, depending on the housing. There is no need to deliberately thicken it; as long as the calculations meet the requirements, that’s sufficient.
The longitudinal joint coefficient is used in the calculation of shell strength, while the circumferential joint coefficient has no effect on the calculated thickness. This coefficient is used when calculating the axial tensile stress of a sphere in a fixed-tube-sheet heat exchanger.
This weld of yours should be detectable by ultrasonic testing; it probably does not fall under this clause. Thickening is not necessary; the stress in longitudinal welds is much greater than that in circumferential welds
If UT or RT is not possible, this should also count.
Both of these are butting joints; for the circumferential seam coefficient, use the conventional value if detection is possible, or 0.6 if detection is not possible. But the first two in the standard are the most commonly used, so there’s no need to consider 0.6