Rectangular Finned Tubes, Double H Fin Tubes

What is HH-type finned tube/Double H finned tubes?

HH type finned tubes are also called rectangular finned tubes. HH type finned tubes is special H type finned tube, which have double tubes. The HH-shaped finned tube is to weld two steel sheets with a circular arc in the middle symmetrically with the light tube to form fins. The front of the fin is shaped like double “H”, so it is called HH-type finned tube. HH-type finned tubes have great effects to recover the waste heat of exhaust gas from power station boilers, industrial boilers, industrial kilns, ship power plants, etc.

How to produce HH-type finned tubes/Double H finned tubes?

HH-type finned tubes is almost same production method. The fins formed by stamping and shearing of the steel plate are manually coded into the sheet automatic unloading hopper, and the feeding cylinder realizes automatic unloading. At the same time, Both steel pipes are transported to the welding position, and the horizontal pushing cylinder pushes the electrode clamping mechanism to realize automatic welding. The electrode clamping mechanism is the key part of the welding machine, and the electrodes on both sides are equipped with material receiving and pneumatic positioning mechanisms. And it is pushed centripetally by the push cylinder, and the fins automatically enter the welding position, clamping and welding, and realize the welding of the fins on both sides and the steel pipes. After the welding is completed, the clamping is released, the finned tube is manually removed, and the steel tube moves forward. The parallel automatic welding of steel pipes and fins can well meet the quality and efficiency requirements of finned tube welding.

HH-type finned tube/Double H 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 ~200 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

HH-type finned tube/Double H finned tubes product advantages:

1. The new finned tube welding process is adopted, and the contact of the fin welding part adopts multiple zigzag shapes, so that the fin welding is firm, the welding shape is uniform, the surface is smooth, there is no slag inclusion, pore welding, and the penetration rate reaches 97%.
2. The welding position adopts multiple zigzag methods, which is equivalent to reducing the local stiffness of the finned tube, thereby reducing the amount of compressive plastic deformation generated during the welding process, reducing the longitudinal residual tensile stress near the weld, and also greatly The residual compressive stress of the sheet away from the weld is reduced, so the wave deformation of the sheet is significantly reduced.
3. The penetration rate is 97%, the surface of the weld seam is uniform and smooth without welding bumps, and the expansion of the heating surface can increase the heat transfer coefficient.
4. The extended heating surface unit has a self-cleaning function, which can slow down the deposition, blockage and wear of soot on the heating surface, especially slowing down the wear can ensure a reasonable service life of the heating surface.

Application of HH-type finned tube/Double H finned tubes:

HH-shaped finned tubes are designed to recover exhaust heat from power plant boilers, industrial boilers, industrial kilns, ship power plants, etc., and effectively improve fuel utilization. The enhanced heat exchange elements are arranged at the tail of the system flue.

Square fin tube, H fin tube, rectangular fin tubes, double H fin tubes

Square Fins are welded on 1 steel base tubes. We call it H Fin Type Tubing. Square Fin Tube with 90 Degree Bends, Rectangular Finned Tubes with 90 Degree Bends

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.

HH Finned Tube with Bend

Rectangular Single or Twin Finned Tubes

H fin tube known as square fin tube, there are two types of H fin tubes, one type with single tube, normal called square fin tube, the other with Double tube, normal called rectangular fin tubes. and also manufactured as per customers requirements. Due to rectangular shapes, which can offer large surface area compared to the Spiral Finned tubes. Due to larger surface area available, these finned tubes are used mostly in Air Heating application to reduce the overall size of the equipment.

H Finned Tube

H fin tube is a kind of boiler parts, which has two steel circular welded on base tubes to form fins positive shape much like letter “H”, so called H-fin tube. H-economizer widely used in utility boilers, industrial boilers, marine power, such as the tail of heat exchanger components.

H Finned Tube Principle:

H Finned Tube economizer has two rectangular fins, similar to a square, its edge length for the fluorescent tubes of 2-fold, an expansion of the heating surface.

Rectangular  Fins are welded on 2 steel base tubes. We call it HH or Doule H Fin Type Tubing.

HH Finned Tube economizer flash resistance welding processes used the welding seam after the high rate of fusion, weld tensile strength, and have good thermal conductivity. H-economizer can also manufacture dual tube “double H” type fin tubes, its rigid structure, and can be applied to a longer tube row occasion.

Max. Working Temperature:  300 °C

Atmospheric Corrosion Resistance: OK

Mechanical Resistance: Good

Fin Material: Copper, Aluminum, carbon steel, stainless steel

Base Tube materials: Any material available, such as Carbon steel Tube, A179, A192, A210, stainless tube A269/A213 T5 T11 T22 304 316

Rectangular Finned Tubes

Single pipe square finned tubes and twin pipe rectangular finned tubes are also manufactured as per customers’ requirements. These are particularly suitable for dust laden exhaust gases, e.g. for economizers in coal and oil fired units or waste incinerators.

Finned Tube—-Square fin tube, H fin tube, rectangular fin tubes, double H fin tubes

Square Fins are welded on 1 steel base tubes. We call it H Fin Type Tubing. Square Fin Tube with 90 Degree Bends, Rectangular Finned Tubes with 90 Degree Bends

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.

Rectangular Single or Twin Finned Tubes

H fin tube known as square fin tube, there are two types of H fin tubes, one type with single tube, normal called square fin tube, the other with Double tube, normal called rectangular fin tubes. and also manufactured as per customers requirements. Due to rectangular shapes, which can offer large surface area compared to the Spiral Finned tubes. Due to larger surface area available, these finned tubes are used mostly in Air Heating application to reduce the overall size of the equipment.

H fin tube is a kind of boiler parts, which has two steel circular welded on base tubes to form fins positive shape much like letter “H”, so called H-fin tube. H-economizer widely used in utility boilers, industrial boilers, marine power, such as the tail of heat exchanger components.

Principle:

H Finned Tube economizer has two rectangular fins, similar to a square, its edge length for the fluorescent tubes of 2-fold, an expansion of the heating surface.

Rectangular  Fins are welded on 2 steel base tubes. We call it HH or Doule H Fin Type Tubing.

HH Finned Tube economizer flash resistance welding processes used the welding seam after the high rate of fusion, weld tensile strength, and have good thermal conductivity. H-economizer can also manufacture dual tube “double H” type fin tubes, its rigid structure, and can be applied to a longer tube row occasion.

Max. Working Temperature:  300 °C

Atmospheric Corrosion Resistance: OK

Mechanical Resistance: Good

Fin Material: Copper, Aluminum, carbon steel, stainless steel

Base Tube materials: Any material available, such as Carbon steel Tube, A179, A192, A210, stainless tube A269/A213 T5 T11 T22 304 316

Rectangular Finned Tubes

Single pipe square finned tubes and twin pipe rectangular finned tubes are also manufactured as per customers’ requirements. These are particularly suitable for dust laden exhaust gases, e.g. for economizers in coal and oil fired units or waste incinerators.