Low-finned Tubes

Wieland GEWA-K tubes are integral low-finned tubes with an enlarged external surface and a plain internal surface.

They are particularly suitable when the heat transfer coefficients on the shell side and tube side differ significantly. Different fin geometries allow the outer surface area to be adapted to the thermal requirements of the application.

Key Characteristics

• Enlarged external heat transfer surface
   
• Plain internal surface
   
• Integral fin construction
   
• Broad selection of fin geometries
   
• Available in a wide range of materials
   
• Suitable for bent and coiled heat exchanger designs

For operating conditions involving increased fouling or corrosion, such as refinery applications, robust GEWA-K configurations with wider fin spacing are also available.

Wieland GEWA-KS tubes combine the enlarged external surface of a low-finned tube with an additional internal groove structure.

The internal structure enhances tube-side heat transfer, making GEWA-KS particularly suitable when the tube-side heat transfer coefficient is low or when both the shell-side and tube-side heat transfer coefficients are low.

Key Characteristics

• Enhanced external heat transfer surface
• Internally grooved surface
• Improved tube-side heat transfer
• Enhancement on both sides of the tube
• Suitable for applications with low heat transfer coefficients
• High potential for compact heat exchanger designs

S/T Trufin® tubes are integral finned tubes that increase the external heat transfer surface while maintaining a plain internal surface.

They are available in a variety of welded and seamless ferrous alloys as well as titanium, providing additional options for applications with specific mechanical, corrosion, or material requirements.

Key Characteristics

• Enhanced external surface
• Plain internal surface
• Integral fin construction
• Multiple fin densities available
• Steel and titanium configurations
• Welded or seamless base tubes depending on material and specification

S/T Turbo-Chil® tubes provide heat transfer enhancement on both sides of the tube.

External integral fins increase the shell-side surface area, while internal helical ridges enhance the tube-side surface. The technology is available in steel and titanium configurations.

Key Characteristics

• Enhanced external and internal surfaces
• Internal helical ridges
• Increased shell-side and tube-side surface area
• Steel and titanium configurations
• Multiple fin and internal-ridge geometries available

GEWA-K and GEWA-KS are integral finned tubes. The fins are formed directly from the wall of a plain tube by roll forming rather than being added separately.

The forming process increases the strength of the finned section while plain ends and intermediate lands remain available for further processing. Depending on the material and subsequent manufacturing process, the tubes can also be prepared for bending or coiling.

Design Flexibility

• Straight tube configurations
• Plain ends and intermediate lands
• Bent tube configurations
• Coiled heat exchanger designs
• Application-specific fin geometries
• Special dimensions and configurations on request

Selected GEWA-K configurations can be manufactured in lengths of up to 18 m. Exact availability depends on material, tube geometry, and configuration.

Optimized for your heat exchanger

Selecting the right tube depends on more than material and dimensions. Heat transfer coefficients, pressure drop, fluids, fouling behavior, operating temperatures, corrosion requirements, and available installation space all influence the optimum surface configuration.

Wieland supports customers with application-specific tube selection and thermal design to identify the appropriate surface, material, and geometry for the individual heat exchanger.