Fixed tubesheet|Fixed tube sheet

What is fixed tubesheet?

A fixed tubesheet is a type of heat exchanger that uses a stationary tube bundle that is welded to the tubesheet, which is in turn welded to the shell or casing of the heat exchanger. The tubes are fixed in place and cannot move relative to the tubesheet, which provides mechanical support and helps to maintain the seal between the tubes and the tubesheet.

About the fixed tubesheets:

1. Fixed tubesheets are commonly used in shell-and-tube heat exchangers, which are widely used in process industries such as chemical, petrochemical, and power generation. The fixed design makes them more suitable for high-pressure and high-temperature applications, as well as for fluids that are prone to fouling or corrosion.

2. The tubesheet is typically made of a high-strength material such as stainless steel or a high-nickel alloy, which can withstand the stresses and thermal cycling of the heat exchanger.

3. The tube bundle is held in place by either a threaded or welded connection, which provides a secure and leak-proof seal. The tubes are often expanded into the tubesheet to increase the strength of the joint and improve heat transfer.

4. The number of tubes and the diameter of the tubes can vary depending on the application, with larger diameters typically used for high-flow or viscous fluids, and smaller diameters used for high-heat transfer applications.

5. The design of fixed tubesheets can be customized to meet specific process requirements, such as using a double tubesheet to provide additional protection against leaks or incorporating a U-tube design to accommodate thermal expansion.

6. Fixed tubesheets are generally less expensive and easier to fabricate than other types of heat exchangers, but they are also less flexible and may require more maintenance over time.

Overall, fixed tubesheets are a reliable and effective design for many heat exchanger applications, offering high thermal efficiency and durability in a cost-effective package.