The most robust, widely specified heat exchanger configuration in industrial service — fixed tubesheet, U-tube, floating head, kettle reboiler, and double tube sheet designs, engineered and fabricated to ASME Section VIII Div. 1 and TEMA RCB class.
A shell and tube heat exchanger is a pressure vessel containing a bundle of tubes — one fluid flows through the tubes while a second fluid flows over them within the shell, exchanging heat through the tube walls by conduction and convection. It remains the most widely used configuration for high-pressure, high-temperature, and high-fouling industrial duty because of its mechanical robustness, serviceability, and ability to handle extreme temperature differentials.
Fintelius engineers and fabricates shell & tube exchangers using HTRI-based thermal rating and PVElite/NozzlePro mechanical design, optimizing tube layout, baffle spacing, and fluid allocation for the specific process duty — not a catalog selection.
Every unit follows the same disciplined, code-governed path through the shop.
Process duty is rated in HTRI, then mechanically designed — tube count, pitch, baffle cut, and shell diameter — to ASME Section VIII Div. 1.
Tubesheets are drilled and machined to the tube layout; shells and channels are rolled and formed to design tolerance.
Tubes are inserted and expanded or welded into the tubesheet, then baffled and supported along the full bundle length.
Code-qualified welders complete shell, head, and nozzle welds; radiography, ultrasonic, and dye penetrant testing verify every joint.
Shell-side and tube-side are hydrostatically tested to design pressure, stamped, coated, and prepared for shipment.
Every shell & tube exchanger is described by a three-letter TEMA code — front head type, shell type, and rear head type. Select each to see what it means.
Click a configuration to see how it's built and where it's specified.
Tubesheets are welded directly to the shell at both ends, giving a simple, lower-cost design with no internal joints to leak. Best suited to clean, non-fouling shell-side service where the shell side never needs mechanical cleaning, since the bundle cannot be removed.
Where a large shell-to-tube temperature differential exists, an expansion joint is added to the shell to absorb differential thermal growth between the shell and tube bundle.
A single tubesheet carries U-shaped tubes that curve back on themselves, so each tube is free to expand and contract independently — no expansion joint is needed even under large thermal differentials. The bundle can be pulled as a single assembly for external cleaning.
The U-bend limits in-tube mechanical cleaning at the bend radius, so it suits services where the tube side runs clean and the shell side may need periodic bundle removal.
One tubesheet is fixed to the shell while the other “floats” free inside or outside the shell, absorbing differential expansion between shell and bundle without an expansion joint. The full bundle can be removed for mechanical cleaning on both shell and tube side.
Sub-types include the pull-through (T), split-ring backing device (S), and outside-packed (P) floating heads — the right choice depends on design pressure, cleaning frequency, and whether external leakage of the floating head gland is acceptable.
An oversized shell section above the tube bundle provides vapor disengagement space, letting the unit boil shell-side liquid off a hot tube bundle — used as reboilers and vaporizers where a clean vapor product must be drawn off without liquid carryover.
A weir plate controls liquid level over the bundle, and the enlarged shell diameter relative to the bundle is the defining geometric feature of the kettle design.
A second, parallel tubesheet is fitted with an open gap between the pair, so any leak past the primary tube-to-tubesheet joint vents to atmosphere rather than cross-contaminating the shell and tube fluids.
Specified where the two process fluids must never mix under any failure mode — common in food, pharmaceutical, and other cross-contamination-critical services.
Flow arrangement changes how much heat an exchanger can recover for the same surface area — toggle to compare.
Co-current (parallel) flow: both fluids enter at the same end and travel in the same direction. The temperature difference between the two fluids is largest at the inlet and shrinks rapidly along the length of the exchanger, so the outlet temperature of the cooled fluid can never drop below the outlet temperature of the heating fluid. Simpler to pipe, but lower overall heat recovery for a given surface area.
Machining, forming, welding, and testing equipment sized for shell & tube fabrication.
Precision drilling to the tube layout, pitch, and ligament tolerances the thermal design requires.
Plate rolling and forming for shells, channels, and heads across a wide range of diameters and thicknesses.
Tube-to-tubesheet joints made by roller expansion, seal welding, or strength welding per the design specification.
Baffle plates cut and fitted to the specified cut percentage and spacing to control shell-side velocity and prevent vibration.
Tube bending to the radii and bend schedules required for U-tube bundle designs.
Code-qualified welders and procedures across carbon steel, stainless, duplex, and exotic alloy materials.
In-house and partnered nondestructive examination — RT, UT, MT & PT — verifying every pressure-boundary weld.
Shell-side and tube-side pressure-test stations sized for large-diameter, high-pressure exchangers.
Post-weld heat treatment and protective coating applied to specification before dispatch.
Weld integrity across shells, heads, and tube-to-tubesheet joints confirmed by RT and UT ahead of hydrostatic test.
Every exchanger is pressure-tested shell-side and tube-side to design specification prior to dispatch.
Tube count, layout, and material traceability verified and documented against the approved design package.
Refineries, gas processing plants, and upgraders specifying high-pressure, high-fouling process cooling and condensing duty.
Corrosion-resistant condensing, cooling, and heating exchangers for reactive and aggressive process streams.
Steam condensers and turbine lube oil coolers supporting continuous power plant operation.
WFI heat recovery, pasteurization, and precise temperature-controlled processing — including double tube sheet designs for zero cross-contamination.
Compressor inter/after-coolers, marine box coolers, and industrial air conditioning heat rejection.
Waste heat boilers and heat recovery exchangers reclaiming thermal energy from process off-gas and effluent streams.