How to determine the welding joint design for the heat exchange tubes and tube sheet in a heat exchanger?
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I would like to ask those who work on vertical heat exchangers: how is the welding joint design between the heat exchange tubes and the tube sheet determined? Thank you
GB151: Determined based on operating conditions and material!
No similar structural weld joint design was found
It is better for the heat exchange tubes on the tube sheet of a conventional vertical heat exchanger not to protrude; otherwise, fluid accumulation on the tube sheet can cause corrosion； The lower tube sheet can be exposed
Is it okay for the heat exchange tubes to protrude 2 mm from the tube sheet? And is it necessary to create chamfered grooves for welding the heat exchange tubes to the tube sheet? Thank you
Check the wall thickness of the tube; the exposed length should generally be at least equal to the wall thickness, though there are also cases where the tube end is below the plane of the tube sheet. Chamfering and grooves are two different concepts; chamfering is done on the edges of the pipe holes in the tube sheet to ensure good welding quality ； The grooves are used for tube expansion; they are created within the tube holes at a certain distance from the tube sheet. Whether to create such grooves depends on the process conditions – for example, if tube expansion is not required, then no grooves are needed; grooves are best avoided in cases of stress corrosion, while they are preferable in situations involving crevice corrosion... First, refer to GB 151
The heat exchange tubes have a thickness of 0.8 mm and are welded together; what I’m referring to here is the chamfering, which is done for the purpose of welding. In vertical heat exchangers, the heat exchange tubes extend 2 mm beyond the upper tube sheet. What should be the size of the chamfer around the tube holes in the tube sheet? Thank you
Read GB 151-2014, Sections 6.6 and Appendix H
I’ve seen this, but I don’t quite understand how to determine the value of L. Is it by reversing the calculation using the formula for pulling stress to find the value of L? Thank you
This weld leg height L is included in the pulling force calculation formula
For welding, it mainly depends on process conditions, properties of the medium, etc