Shrao Engineering Works
Bhopal, Madhya Pradesh
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Finned Tubes

Our product range includes a wide range of Finned Tubes such as Extruded Fin Tube, L Or Wrap - On Finned Tube, KL Or Knurled Finned Tube, LL Or Overlapped Finned Tube, Wire Wound Fin Tube and Crimped (Tension Wound & Root Soldered).


Extruded Fin Tube

Extruded Fin Tube
Extruded Fin Tube

The Extruded Fin is formed from an outer aluminum tube with a large wall thickness (Muff) which is aligned over an inner base tube. This assembly is fed into the fining machine which literally squeeze and extrude the aluminum fins up and out of the muff material in a spiral shape and give firm pressure contact with the base tube in a cold rotary extrusion process.
These are high efficiency fins for the high temperatures. These fins provide the base tube with complete and permanent corrosion protection against atmospheric contaminants.

Technical Data:

  • Diameter of the base tube: 15-45mm
  • Finned tube OD: 30-70 mm.
  • Pitch: 8 to 11 FPI
  • Fin  thickness: 0.25- 0.45 mm
  • Finned tube length: 0- 15m.
  • Finned material: Aluminum.
  • Base tube material: Any material

L Or Wrap - On Finned Tube

L Or Wrap - On Finned Tube
L Or Wrap - On Finned Tube

The L type fin is also known as wrap on fin. The fins are wound under tension over the base tube and the contact between the fin and the base tube is by 'L' foot shape and thus provides some degree of tube wall protection. These are standards fins for low temperature application.

Technical Data:

  • Tube specification: 16-38mm
  • Fin material: aluminum, copper
  • Suitable finned tube material: stainless steel, carbon steel, copper, aluminum, cupro nickel, admiralty brass etc.
  • Fin height: < 20 mm
  • Fin thickness: 0.2mm to 1mm
  • Fin pitch: 2.0-10mm

KL Or Knurled Finned Tube

KL Or Knurled Finned Tube
KL Or Knurled Finned Tube

The KL type fin is manufactured similar to L fin except that the base tube is knurled before wrapping the “L" shaped fin strip. Thereafter the foot of the fin is knurled into the knurling of the base tube to ensure tight bond with the base tube resulting into increased thermal performance.

Technical Data:

  • Tube specification: 16-38mm
  • Fin material: aluminum, copper
  • Suitable finned tube material: stainless steel, carbon steel, copper, aluminum, cupro nickel, admiralty brass etc.
  • Fin height: < 20 mm
  • Fin thickness: 0.2mm to 1mm
  • Fin pitch: 2.0-10mm

LL Or Overlapped Finned Tube

LL Or Overlapped Finned Tube
LL Or Overlapped Finned Tube

The LL type fin is commonly known as double L or overlapped L fin manufactured in the same way as the L fin type except that the foot is overlapped to completely cover the base tube thereby giving excellent corrosion resistance. This type is used as an economical alternative to extruded type fin. The overlapping prevents separation and movement under cyclic.

Technical Data:

  • Tube specification: 16-38mm
  • Fin material: aluminum, copper
  • Suitable finned tube material: stainless steel, carbon steel, copper,  aluminum, cupro nickel, admiralty brass etc.
  • Fin height: < 20 mm
  • Fin thickness: 0.2mm to 1mm
  • Fin pitch: 2.0-10mm

Wire Wound Fin Tube

Wire Wound Fin Tube
Wire Wound Fin Tube

These tubes are manufactured using wire in place of strip and wound helically over the tube with root soldering at foot to avoid air  gaps between fin and the tube resulting in to higher heat transfer efficiency, reliability and longer service tube.

Technical Data:

  • Diameter of the base tube as per requirement
  • Tube material: Carbon steel/ Stainless steel, admirality brass tube/ copper/ cupronickel
  • Finned material: GI wire/ stainless steel wire/ copper wire
  • Wire thickness: 5mm to 1.50mm 
  • Fin OD ,Loops per turn, turn per foot/ meter: as per requirement

Crimped (Tension Wound & Root Soldered)

Crimped (Tension Wound & Root Soldered)
Crimped (Tension Wound & Root Soldered)

These types of fins are crimped and wrapped under tension over the base tube and automatically root soldered at the base for better bonding.

Technical data

  • Tube specification: 16-38mm
  • Fin material: aluminum, copper
  • Suitable finned tube material: stainless steel, carbon steel, copper, aluminum, cupro nickel, admiralty brass etc.
  • Fin height: < 20 mm
  • Fin thickness: 0.2mm to 1mm
  • Fin pitch: 2.0-10mm


Corporate Information

Shrao Engineering Works

Mr. D. D. Sethia (Proprietor)
F-89, Industrial Area, Govindpura
Bhopal - 462023
Madhya Pradesh, India
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