Floating-head tubesheet

The tube-side fluid now flows into the floating head, which acts as a return header for the tubes. The tube-side flow makes a 180° turn and flows back through the top hah of the floating-head tubesheet. The floating head is firmiy attached to the floating-head tubesheet. But why is it that one end of the tubes must be left free to float The reason is thermal expansion—or, more precisely, the differential rate of thermal expansion between the tubes and the shell. 

A new, center, pass partition baffle is welded in the floating head. The floating-head tubesheet must also be remachined. 

Shells, Channels, Covers, Floating Heads, Tubesheets, and Flanges Pipe... 

The difficulty of getting a tight, leakproof closure between the floating-head tubesheet and the head itself... 

Floating head The component of a shell-and-tube exchanger that covers the floating-head tubesheet. 

Floating-head tubesheet The end of a tube bundle left free to move, due to thermal expansion. 

Type of Design U Tube Fixed Tubesheet Floating Head Outside Packed Floating Head Split Backing Ring Floating Head Pull-Through Bundle... 

In the pull-through, floating-head design, the floating-head cover is bolted directly to the floating tubesheet. This allows the bundle to be removed from the shell without removing the shell or floating-head covers, which eases inspection... 

A pull-through, floating head, kettle-type reboiler having stationary head integral with the tubesheet, 23-in. port diameter and 37-in. inside shell diameter with tubes 16 ft long is denoted as SIZE 23/37-192 TYPE CKT,... 

Floating Head 10-lB One tubesheet floats in High temperature differentials. Internal gaskets offer ... 

Figure 10-25F. Fixed tubesheet layout (also nonremovable floating head). Tube passes two. Tube size and pitch V4 in. on in.A.

The detailed design of the tube bundle must take into account both shell-side and tube-side pressures since these will both affect any potential leakage between the tube bundle and the shell which cannot be tolerated where high purity or uncontaminated materials are required. In general, tube bundles make use of a fixed tubesheet, a floating-head or U-tubes which are shown in Figures 9.62, 9,63 and 9.64 respectively. It may be noted here that the thickness of the fixed tubesheet may be obtained from a relationship of the form ... 

U-Tube/ Packed Floating Head/ Packed Floating Tubesheet/ Internal Floating Head (All these types have removable bundles) ... 

Tubesheet Floating Head Fioating Head U-Tube... 

Tubesheet Floating Head Floating Head U-TUbe... 

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