Rectangular Finned Tube
Rectangular Finned Tubes,When viewed in cross-section, the combined structure of the fins and the base tube presents a rectangular configuration.This rectangular design provides high compactness in regular arrangements and creates straight, uniform flow passages.
- Base Tube Material:
CS (A106, A333, A179, A210, P5, P11, P22)
SS (SS304, SS316, Duplex SS2205, Super Duplex SS32750)
Nickel Alloys (825, Inconel Alloy 625, High chrome high nickle incoloy alloy Monel 400) - Tube OD:25mm-73mm or customized
What are Rectangular Finned Tubes?
The overall fin profile is rectangular, distinguishing it from conventional fin shapes such as circular or spiral.
Rectangular Finned Tubes,When viewed in cross-section, the combined structure of the fins and the base tube presents a rectangular configuration.
This rectangular design provides high compactness in regular arrangements and creates straight, uniform flow passages.
1. Rectangular Fins + Square/Rectangular Base Tube
Represented by the classic Square H / Rectangular HH Finned Tube. Its base tube is square or rectangular, with two separate thick rectangular fins symmetrically welded on both sides, forming an “H” shape.
Square H / Rectangular HH Finned Tube – Ensuring long-term stable operation in harsh environments, resisting wear and ash deposition.
Open flow channel design
The H-shaped structure creates straight, unobstructed “flue gas corridors,” allowing dusty gas flows to pass through smoothly. This significantly reduces vortex zones and ash accumulation dead spots while facilitating sootblower cleaning.
Trading partial compactness for reliability
Compared to tightly wound spiral circular finned tubes, H-type tubes have larger spacing. This ensures that heat exchange performance does not rapidly degrade due to ash blockage when burning low-quality fuels or processing high-dust exhaust gases.
Enhanced structural rigidity
Thick-walled base tubes and fins are used, and continuous welding processes form a rigid integrated structure capable of withstanding high-temperature flue gas scouring, thermal stress cycling, and strong vibrations.
2. Rectangular Fins + Specially Shaped Base Tube
Represented by the Elliptical Finned Tube. Its base tube is flat-oval in shape, with rectangular fins slipped over the outer surface, resulting in an overall rectangular cross-section.
Elliptical Finned Tube – Maximizing heat transfer in limited space while minimizing flow resistance
Aerodynamic optimization
The elliptical base tube, with its streamlined leading edge, significantly reduces air or flue gas resistance (pressure drop), thereby greatly lowering the energy consumption of associated fans.
Compact layout
The combination of a flat oval tube and rectangular fins allows closer arrangement of tube bundles along the airflow direction, enabling greater heat exchange area within the same volume and improving equipment space utilization.
Rectangular Finned Tubes
We offer rectangular finned tubes as single or twin tubes in addition to the proven helical or spiral fin design.
These rectangular finned tubes are particularly good suited for dust laden exhaust gases that tend to scaling, e.g. for economizers in coal or oil fired units. Straight tube arrangements favour a decrease of scaling as well as easier cleaning and maintenance and will lower the resistance coefficient.
We are designing and manufacturing fin tube modules, economizers/heat exchangers and the suitable heating surface cleaning systems according to your requirements.
Base Tube Material: 09CrCuSb/09CrCuSb
Tube OD and Wall Thickness: 32*3.5 mm
Tube Length: 6159 mm
Fin Thickness: 1.5 mm
Fin Spacing: 20 mm
Quantity: 233 pieces
- Datasheet
- Drawing
- Certificates
Rectangular finned tubes material and size:
| Base Tube O.D (mm) | Base Tube Thickness (mm) | Fin Height
(mm) |
Fin Thickness (mm) | Fin Pitch (mm) |
| 25.4 mm ~50.8 mm | 2.5 mm ~5.0 mm | 50 mm ~100 mm | 0.5 mm ~3.0 mm | 5 mm ~ 25.4 mm |
| Base Tube Material | Fin Material | Tube Length (Mtr) | ||
| Carbon Steel ,Alloy Steel ,Stainless Steel, ND steel | Carbon Steel ,Alloy Steel ,Stainless Steel, ND steel | ≤ 15Mtrs | ||
Rectangular Finned Tubes Appearance Dimension Inspection
Rectangular finned tubes appearance dimension inspection is one of the important links to ensure the quality and performance of fin tubes.
The inspection items mainly include fin height, fin spacing, fin thickness, base tube wall thickness and outer diameter, etc.
Datang Rectangular Finned Tubes Water Pressure Testing
The main purpose of the rectangular finned tubes hydrostatic test is to verify the strength and sealing performance of the pipeline and ensure that it can operate safely under the design pressure without leakage or structural damage.
Rectangular Finned Tubes Strength and Pressure Resistance Testing: By applying water pressure exceeding the design pressure, the material strength and structural stability of the finned tubes are tested to prevent deformation or rupture due to overpressure.
Rectangular Finned Tubes Sealing Verification: The sealing properties of pipe joints, welds, and other areas are checked to prevent leakage that could lead to heat transfer loss or environmental contamination.
Rectangular Finned Tubes Welded Machine
Cangzhou Datang Steel Pipe Co., Ltd has advanced Rectangular Finned Tubes Welded Machine, H-type finned tube machine is a special equipment for producing H-type finned tubes.
