Customized Multi-Port Extruded Aluminium Tubes

Extruded Fin Tube Product Description:

Copper-aluminum composite finned tube is a copper-aluminum composite tube that is rolled out of fins after compounding. It has the characteristics of close combination, small thermal resistance, good heat transfer performance, high strength, small flow loss and strong corrosion resistance. It is not easy to be deformed in the case of long-term cold and hot work and long working life.   

The whole rolled fin is smooth without burr, no wrinkle, easy to clean, in the heating and air conditioning engineering wet cooling is easy to remove the condensation on the outside surface of the fin, in the heat exchange heating and other occasions not easy to dust, fouling.

Extruded Finned Tube Manufacturing Process:

The fins are rotary cold rolled from a smooth thick walled hollow blank tube slid over the core tube. Three multi spindle disc packs extrude the hollow blank tube into helical high fins.

During this process the inner diameter of the hollow blank tube is reduced and at the same time pressed on the core tube. This results in a mechanically solid joint. Longitudinal slots are cut into the outer periphery with inclined fin tips.

Fin Material: Aluminium.

Core Tube Material: Carbon Steel/ Carbon

Alloy Steel/Stainless Steel/ Nickel Alloys/Copper/Copper Alloys/Titanium.

Extruded Fin Tubes Advantages:

100% fin-to-tube bond providing exceptional efficiency and longevity.

Excellent corrosion protection on the base tube.

Easy to clean with a high-pressure water jet without deforming the fins.

As the outer sleeve is continuous No galvanic corrosion between the tube and fins.

The bonding of the outer and inner tubes removes the risk of loss of contact with the aluminium due to thermal stress and fins are vibration resistant.

Higher heat transfer performance for the life of the unit.

Extruded Finned tubes are commonly used in applications with temperature up to 325 °c.

Extruded Aluminum Tubing Properties:

The extruded fin is formed from an outer aluminum tube with a large wall thickness (muff), which is aligned over an inner base tube. The two tubes are pushed through three arbors with rotating discs that literally squeeze or extrude the aluminum fins up and out of the muff material in a spiral shape in one operation. The resultant fin typically has a base or root thickness of .035", average fin thickness .016" and a tip of .009", with an overall height of 16mm (5/8"). The root thickness serves to form an uninterrupted bond over the entire tube length.

Murphy disc technology now makes it possible to fin thinner muff thus offering significant material savings. Recommended standard muff wall is .176" as opposed to industry practice of .183"-.210" In addition, the same growth factor can be used for pitches from 8 - 11 FPI, allowing for standardization on one muff thickness and eliminating the need to stock multiple muff wall thicknesses. The same discs can be used to produce 5/8" (15,9mm) or 1/2" (12,7 mm) high fin.

Model B produces a 5/8" high fin on tube sizes from 25mm to 1.5" ( 38.1mm). The Model B Extruded Finning Machine is now capable of 7/16" high integral copper fin at 7 to 10 FPI within the tube size range of the machine (25mm and 1.5"). Each machine is configured for the specific production requirements of the end user.

Aluminum Extruded Tubing Applications：

Air Cooler,Air preheater,Charge Air Chiller, Condenser,Evaporator, Fluid Cooler, Gas Cooler,Oil Cooler, Radiator, Refrigeration,Steam to Air Heat Exchanger etc.

Extruded Aluminum Tube Specifications：