Issues with welding heat exchanger tube sheets; seeking expert assistance to resolve them
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Urgent! As shown in the figure: The flange should originally be fitted onto the cylinder first, then the tube sheet and the cylinder should be welded together, and finally the flange should be welded. As a result, the workers didn’t understand the drawings and didn’t consult the designers; they welded a flange at the joint where the cylinder meets the tube sheet. They asked whether it would be possible to weld the cylinder to the tube sheet at the U-shaped stress relief groove inside the cylinder The design pressures for the shell side and tube side are 0.5/0.25 MPa respectively, with a temperature of up to 140 degrees Celsius.
Is it of the thin tube sheet type? It is still not recommended to use this structure
It’s not a thin tube sheet; it’s the type C structure shown in Figure 7-3 of GB151.