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Quotes - Engineering - SalesU-Tube vs Floating Head Exchangers
When the Extra Cost Is Justified
A floating head lets the rear tubesheet move axially inside the shell. Tubes are straight, so they can be cleaned end to end, and the bundle still comes out for shell-side access. It is the most capable construction and the most expensive.
The deciding question. Does the tube-side stream foul in a way that needs mechanical cleaning? If yes, floating head, because a U-bend cannot be rodded. If no, U-tube, because you are paying for a capability you will never use.
Joint count at pressure. A floating head has a rear pressure-boundary joint that moves in service and must stay sealed. A U-tube has none. As pressure rises that difference becomes a strong cost and reliability argument for the U-tube.
Types of floating head. Split-ring is the usual choice where both expansion and shell-side cleaning are needed. Pull-through is simpler to maintain because the bundle comes out whole, but carries fewer tubes due to the annular clearance. Packed and outside-packed designs are cheaper and are limited to fluids that are neither toxic nor volatile, because the packing can leak.
Typical Construction
- Split-ring floating head: Standard where expansion and tube cleaning are both needed
- Pull-through floating head: Bundle removes whole; fewer tubes for the same shell
- Packed floating head: Lower cost; not for toxic or volatile fluids
- U-tube joint count: No rear pressure-boundary joint
- High pressure: U-tube generally preferred
- Fouling tube side: Floating head preferred
- Corrosive shell fluid: U-tube avoids an external floating-head cover exposed to it
- Cost ranking: U-tube below floating head in every comparable size
U-Tube vs Floating Head Exchangers
Why the Rear Joint Matters More Than It Sounds
A floating head's rear tubesheet moves as the bundle grows, and the seal has to hold while it does. That joint sits inside the shell, so a leak lets the two fluids mix internally where nothing external indicates it.
On a corrosive or hazardous shell-side fluid this matters twice over: the joint is harder to inspect and the consequence of a leak is higher. A U-tube bundle simply does not have this component.
Common FAQs
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