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Chemical and Process Engineering Resources

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Category: Heat Transfer Technology
Question: What are some good strategies for curing tube vibration in shell and tube exchangers?
Keywords: tube,vibration,abatement,cure,shell,tube,exchangers,heat,
Answer: Most flow induced vibration occurs with the tubes that pass through the baffle window of the inlet zone. The unsupported lengths in the end zones are normally longer than those in the rest of the bundle. For 3/4 inch tubes, the unsupported length can be 4 to 5 feet. The cure for removable bundles, where the vibration isn't severe, is to stiffen the bundle. This can be done by inserting metal slats or rods between the tubes. Normally this only needs to be done with the first few tube rows. Another solution is to add a shell nozzle opposite the inlet so as to cut the inlet fluid velocity in half. For non-removable bundles, this is the best solution. Adding a distributor belt on the shell would be a very good solution if it wasn't so expensive. Source: Gulley Computer Associates