DELLOK SA179 Extruded Finned Tube

^Properties:

^{This fin type is formed from a bi-metallic tube consisting of an aluminium outer tube and an inner tube of almost any material. The fin is formed by rolling material from the outside of the exterior tube to give an integral fin with excellent heat transfer properties and longevity. Extruded fin offers excellent corrosion protection of the base tube. Maximum operating temperature for this fin type is 280°C.}

^{Tube materials : No theoretical limits.}

^{Product Description:}

^{A carefully degreased core tube is fitted into an aluminium primary tube.This assembly is then fed into the triple-spindle finning head of the fin-extruding machine. Three special multi-disc packs extrude the aluminium tube into helical high fins while reducing the inner diameter to give firm pressure contact with the core tube
Fin materials: Aluminium
Base tube materials: Any metallic material}

^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.}

^{Feature Properities:}

^{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.}

^{Applications:}

^{the petroleum, chemical and petrochemical industries
natural gas treatment
the steel industry: blast furnace and converter cooling systems
power generation: steam turbine exhaust condensing
– contact condensing with cooling of circulating condensate
– fossil and nuclear power plants
air conditioning (freon, ammonia, propane)
incineration of household refuse
compressor coolers, ect.}