Modular, counterflow finned-tube coils that use steam to raise air temperature for combustion air preheating, dryer supply air, and process air heating — engineered up to 400°C and 60 bar steam duty.
A steam air heater is an indirect heat exchange device: steam flows inside finned tubes while air passes over the outside, with heat crossing the tube wall and fin surface without steam and air ever coming into direct contact. As steam gives up its latent heat, it condenses to water and drains away, while the air stream leaves the coil at a controlled, elevated temperature.
Large industrial units are built in a modular, counterflow arrangement — cold incoming air is first warmed by a condensate section, then brought to full temperature in the steam section — bolted together with interconnecting manifolds rather than housed in a single cassette, so any module can be removed, inspected, and replaced independently.
Every steam air heater follows the same disciplined path through the shop.
Air volume, discharge temperature, and available steam pressure are rated to size the steam, condensate, and optional flash sections.
Elliptical, round, or smooth tubes are finned in aluminum or stainless steel to the required surface area.
Finned tube bundles are assembled into bolted modules with steam inlet and condensate outlet headers.
Modules are mounted in the duct casing and connected by interconnecting manifolds in counterflow arrangement.
Coils are pressure-tested, insulated as specified, and prepared for shipment.
Drag the slider to see approximately what discharge air temperature a given steam pressure can deliver.
Click a configuration to see how the counterflow arrangement is built.
Incoming cold air first passes over the condensate section, picking up residual heat from steam that has already given up most of its latent heat, then continues into the steam section for final heating to target temperature. This counterflow path improves overall steam economy versus a single-section design.
Suited to most industrial combustion air preheating and dryer air supply duties where a single steam pressure is available and flash steam recovery isn't required.
A flash section recovers additional heat from flash steam generated when high-pressure condensate is let down to a lower pressure, further improving overall thermal efficiency. Air passes flash, then condensate, then steam sections in counterflow sequence before final discharge.
Specified where flash steam is otherwise vented to atmosphere or where maximum steam economy is a project priority — common on larger utility and process heater installations.
Aerodynamic elliptical profile reduces air-side pressure drop and fouling compared to round tube, favored for high air-volume duty.
Conventional round tube with aluminum or stainless steel fins — the standard, most widely specified construction.
Bare tube or compact heat exchanger format for lower-duty or fouling-prone air streams where fin cleaning access is limited.
Fin forming, module assembly, and testing equipment sized for steam air heater fabrication.
Elliptical and round finned tube production in aluminum, stainless steel, and steel fin materials.
Bolted module fabrication with steam inlet and condensate outlet headers sized to the design.
Galvanized or stainless steel casing fabricated to the specified duct size and layout.
Interconnecting manifolds linking steam, condensate, and flash sections in counterflow arrangement.
U-bend tube fabrication that absorbs thermal stress without transmitting it to the tube-to-tubeplate joint.
Code-qualified welders across carbon steel and stainless steel materials.
Pressure-test stations verifying steam-side integrity up to 60 bar design pressure.
Insulation and lagging applied to casings and headers per the thermal and safety specification.
Hot-dip galvanizing or protective coating applied to frame and casing components before dispatch.
Steam-side hydrostatic testing verifies pressure-boundary integrity up to design steam pressure.
Fin bond, tube layout, and surface finish inspected against the approved thermal design package.
Bolted module and manifold interfaces dry-fit and verified before dispatch for straightforward site assembly.
Raising cold combustion air above acid dew point for furnaces, fired heaters, incinerators, and steam reformers.
Drying section air supply and moisture profile control using low-to-medium pressure steam.
Process air heating for industrial dryers, coating lines, and drying tunnels.
Combustion air preheating for crude distillation units, fired heaters, and process furnaces.
Rapid start-up, thermally stressed batch process heating for food, dairy, and pharmaceutical production.
Coated and stainless steel construction for highly corrosive industrial air streams.