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Heat Exchange Tube

Heat Exchange Tube

Heat Exchange Tube

In what case that the heat exchanger tube must be in welded and expanded? Or it is required to expanded? Please help to explain it

RE: Heat Exchange Tube

What material for tube and tube sheet?
How critical is seal?
How much thermal (and pressure) cycling?
In many applications rolled only is fine.
If you have a clad or overlayed tubesheet you must weld.
Acid coolers are welded because a leak is highly destructive.
And don't get me started on procedures, I can go on for a while......

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

RE: Heat Exchange Tube

Tube-to-tubesheet joints can be fully strength welded, partially strength welded, seal welded, expanded, or packed with a compression fitting. Tubes that are seal welded are normally expanded as well, but strength-welded tubes typically only require expanding to prevent crevice corrosion on the shell-side of the tubesheet.

Strength welds are typically specified to provide additional protection against leakage, but it some cases (e.g. fixed tubesheet exchangers, vertical floating-head exchangers) they can enhance the load-carrying capacity of the tubes.

Reasons for specifying welded tube-to-tubesheet joints include 1) to protect against interstream mixing of the shell-side and tube-side fluids, 2) to protect the base metal from corrosion for clad tubesheets, 3) to protect hazardous streams from leaking to the environment (first through the tubesheet joint then through a downstream gasketed joint), and 4) to enhance to load-carrying capacity of the tubes.


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