Which of the following statements is true about the Fixed Tube Sheet shell and tube exchanger?

In the context of a Fixed Tube Sheet shell and tube exchanger, each of the provided statements accurately describes characteristics associated with this type of heat exchanger.

The design of a Fixed Tube Sheet exchanger is such that the tube sheets are indeed welded to the shell. This means that the tubes are fixed in position at each end, creating a stationary structure that facilitates effective heat exchange while maintaining a separation between the two fluids flowing through the shell and the tubes. This configuration also supports robust pressure for the fluids and is essential for heat exchangers meant for higher-pressure applications.

Additionally, tube sheets in a Fixed Tube Sheet exchanger can extend beyond the shell, allowing for secure bolting. This design feature enables easier maintenance, allowing the exchanger to be dismantled and serviced without needing to remove the entire unit from its installation site.

It's also worth noting that this type of exchanger enables brush cleaning, an important maintenance aspect that helps to ensure efficient operations over time. Brush cleaning is necessary to prevent fouling and maintain heat transfer efficiency. The rigid structure of the tubed design supports this cleaning method effectively.

Thus, all these characteristics collectively highlight that the Fixed Tube Sheet shell and tube exchanger is versatile in construction and maintenance, making this statement collectively true.