Integral Fin Tubes
Integral fin tubes were developed to increase the heat transfer performance of fluids while reducing the physical size and cost of the heat exchanger. In these tubes the fins are rolled out from the wall of the tubes and hence are integral with the tube. As the fins are formed from the base tube by rolling out material from its wall, the wall thickness under the finned section is reduced compared to the wall thickness at plain ends. These fin tubes can be manufactured from most tubular materials and the hardness of the material usually determines the finning code or fin profile. The harder materials such as Nickel Alloys, Stainless Steel, Titanium are supplied with higher density (i.e 26,28,30 or 36 FPI). This shallow profile reduces the work hardening of the material and helps eliminate the possibility of root fin cracking.
Whereas, with softer materials like Carbon Steel, Copper, and Copper Alloys are supplied with deeper profile giving a lower fin density (i.e 16 or 19 FPI).
These tubes can also be supplied with intermediate plain landing as well as U Bent, where the U Bend portion can be Finned or Un-Finned.
• Turbo-Chill Tubes
• End Cross Tubes
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Corrugated Tubes
CORRUGATED Tubes are formed by making a spiral groove along the surface of the tube through a specialised rolling process. Due to this process the inner and outer surface of the tube get spiral shape rotating impressions. This helps in creating an extra turbulence inturbulent fluids that flow along the tube. This extra turbulence generated due to the spiral grooves results in a substantial increase in the heat transfer of a heat exchanger compared to a plain tube. Corrugated tubes are generally made out of thin walled tubes in various ferrous and non-ferrous materials.
Advantages
1. Extended heat transfer area
2. Reduces Heat exchanger size and cost
Areas of Application
1. Vaporisers
2. Oil and air cooling systems
3. Furnace
4. Food processing industry
5. Chemical process systems
6. Heat recovery plants
7. Absorber systems
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Cooling Coils
COOLING COILS in various forms are available for direct application in various types of Heat Exchangers. These coils are manufactured mainly from Copper and from Stainless Steel. We manufacture a range of standard COOLING COILS who's dimensions are adapted to the standardised components used in the heating industry. We also customise these COOLING COILS in our in house design facility as per the customer's requirement for different applications. Our design team works closely with the customer to understand their requirement and to develop an economic and optimised solution for their requirement.
External Finned Tubes
"L" Finned Tubes
These finned tubes are used in low temperature applications and where a certain degree of protection of the tube wall thickness against corrosion is required. "L" Fins are usually called as the Wrap-On Fins, where in the fin metal strip is tension wound around the tube. The fins are manufactured from a preformed L shaped strip which is then continuously helically wound under tension on the tube. In this case each fin is in contact with the adjacent fin which provides certain amount of protection from atmospheres which are not very corrosive. This manufacturing process allows the use of relatively thin walled tubes. The fins are secured at each end to prevent unwinding.
Fin Material: Aluminum or Copper
Tube Material: Carbon steels low-alloy steels, stainless steels, brass, copper, coppernickel alloys, aluminium brass, nickel-alloys (Alloy 400, ext.), bimetal, titanium and others
Working Temperature: 130Degree C. maximum
"KL" Finned Tubes. (Knurled "L" Fin Tubes)
"K" finned tubes were a further development to the L Finned tubes, for increased temperature levels and increased protection to the tube surface. In these fins the foot of the fin is shaped before it is tension wound on the tube similar to the L type fins. The fins are rolled into a taper on the base tube by the knurling tool which makes the fins curl. This process allows the fins to tightly bond with the base tube for increased thermal performance as the area for heat transfer increases. The joint between the fin and the tube is air tight which improves corrosion protection. Similar to the L fins these are also secured at the ends to prevent unwinding.
"G" Finned Tubes ( Embedded Fin Tubes)
These fins are used in applications where high thermal or mechanical stress is involved. These are commonly called as embedded fins. The fins are manufactured by continuously helically winding the strip into the machined grooves and further embedded in to the groove by high pressure expansion. The material displaced is then placed along the fin side. Fin Material: Aluminium / Copper / Steel / Galvanized Steel
Tube Material: Carbon steels, low-alloy steels, stainless steels, brass, copper, copper-nickel alloys, aluminium brass, nickel-alloys (Alloy 400, etc.), bimetal, titanium and others
Extruded Fins
These fins give complete protection to the base tube and are much stronger than the applied fin tubes due to the work hardening of the fin material during extrusion process. Fin Material: Aluminium
Tube Material: Any
Upper Limit on Temperature: 350 Degree C
Bi-Metal Finned Tubes
These tubes have high heat transfer capabilities. The fins are formed form a sleeve around the tube. The sleeve is pressed around the tube which reduces its inside diameter. This process creates a strong joint which enhances the heat transfer. These tubes are used in application of high operating temperatures and the tube is protected fully against atmospheric corrosion. The extruded fins feature 40% more aluminium than comparable fins which makes it more sturdy and resistant to mechanical stress. Hence these tubes are mainly fit for all aggressive chemicals. Fin Material: Aluminum
Tube Material: Any Metal
Working Temperature: 250 Degree
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