Integral Finned Tubes

Integral finned tubes are manufactured by rolling process on plain tubes. During finning operation, the inside diameter of the plain tube is reduced and helical fins are rolled on the tube wall.

Product Range

  • Integral Low Finned Tubes
    • These have fin height less than or equal to fin pitch.
    • Tube Length: Up to 20 meter.
    • Outside Diameter: Between 9.52 mm and 38.10 mm.
    • Tube wall thickness: 0.58 mm (min) and above.
    • Fins per Inch: 11, 16, 19, 23, 26, 30, 40 and 52 FPI.
    • Available in ferrous and nonferrous materials.
  • Integral Medium High Finned Tubes
    • These have fin height more than fin pitch.
    • Tube Length: Up to 20 meter.
    • Outside Diameter: Between 19.05 mm and 31.75 mm.
    • Tube wall thickness: 2.1 mm (min) and above.
    • Fins per Inch: 11, 16 and 19 FPI.
    • Available in ferrous and nonferrous materials.
  • Low Finned Tube U Bends
    • Manufactured on in-house finned tube bending facility.
    • Easy to install in the equipment maintaining the circulation ratio.
    • Absorb thermal shocks in heat exchanger.
    • Available in copper, Cupro-Nickel, Ad-Brass, Al-Brass, Carbon Steel, Stainless Steel ranging from 30R to 710R.
  • Low finned tubes with internal rib
    • Externally enhanced surface area with integrally helical ribs on the inner side.
    • Improved inside heat transfer coefficient.
    • Available in copper, Cupro-Nickel, Carbon Steel with externally 19, 26 fins per inch and internally 8, 10 Ribs.
  • Low Finned tube Coils
    • Manufactured by coiling the integral finned tube.
    • Improved heat transfer area therefore compact size of heat exchangers.
    • Available in Copper, in coil diameters as per user’s requirement (Min Coil ID 50 mm).
  • Corrugated Tubes
    • Manufactured by corrugation process of indenting plain tube with smooth and uniform spiral projections, which generate turbulence in both outside and inside media.
    • Higher turbulence ensures uniform temperature distribution.
    • No thinning of tube wall during process of corrugation.

Characteristics

  • Heat transfer per meter of tube on the outside is equal to the heat transfer per meter on the inside.
  • The intermediate un-finned section and un-finned sections at both ends help to slip the integral finned tubes in to the tube-sheets of shell and tube heat exchanger in a manner similar to plain tubes.

Benefits

  • Combination of lower fin height and more fins per meter maintains the general ratio of 1:1 fin height to fin spacing.
  • Doesn’t require higher tube pitch therefore, doesn’t require shell size higher than shell of bare tube heat exchanger.
  • Improved heat transfer coefficient and rate of heat transfer as compared to conventional finned tube designs.
  • Compact design of heat exchanger having lesser weight and size.
  • Improved tube life.

Quality Assurance

  • Compliance with quality standards, ASTM, SB111, SB-359, SA-213, SA-213M, SA-450, SA-450M and all codes as per ASME /EN/ JS.
  • Customer / third party inspection as per approved quality plan.
  • Fin dimensions checking by IMTEs and Profile checking on profile projector.
  • Stress relief annealing of non-ferrous fin tube on in-house electric conveyor belt furnace.
  • Stress relief annealing of ferrous fin tubes as per specifications provided if required by client at additional cost.
  • 100% tubes tested for leakages by pneumatic pressure test (air under water) or hydro test as per code requirements and customer’s specifications agreed in purchase order.
  • Third party inspection can be offered from Lloyd’s, BV, TUV, BHEL, NTPC, Intertek, SGS, EIL, IBR etc. as per customer requirement.

Applications

  • Power Plants
  • Heat Recovery Steam Generators
  • Petrochemical Industries
  • Marine Applications
  • Refrigeration Applications
  • Economizers
  • Gas Coolers
  • Condensers and Evaporators
  • Oil Coolers
  • Shell and tube type heat exchangers handling media such as water, steam, oils process air, gases etc.
  • Other various Heat exchanger applications
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