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FEMOD

HIGH-FINNED TUBES FOR HEAT EXCHANGERS

The use of high-finned tubing significantly enhances the effect of heat transfer between external (air) and internal fluids. Basic tube is made of copper, brass, aluminium or steel, with aluminium and/or copper fins.

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FEMOD manufactures several types of finned tubing for various applications, if required for heavy-duty operation as well. Such tubes are used for production of all types of air coolers, condensers, gas coolers, drying units, etc.

Apart from their extraordinary technical characteristics, application of finned tubing significantly reduces investments in equipment for water supply, filtration, water preparation and return into natural waterflows as well.

TYPES OF FINNED TUBING
Type”L”
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  • max. working temperature up to 120 °C,
  • temperature oscillations up to 60 °C,
  • temperature oscillation cause no deformation of fin shape which remain in firm contact with the basic tube
  • fin base protects the tube from corrosion.
Type”KL”
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  • max. working temperature up to 180 °C,
  • temperature oscillations up to 100 °C
  • fin base is “L” shaped and imbedded in knurled basic tube surface. The imbedded fin bases do not deform providing perfect antirust protection
  • the wide temperature oscillations are acceptable permanently providing high heat coefficient transfer
  • during high temperature oscillations fins remain in firm contact with the basic tube, thus eliminating occurence of elastic fin deformation and contact weakening
Type”LL ”
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  • max. working temperature up to 150 °C
  • temperature oscillations up to 60 °C
  • temperature oscillation cause no deformation of either fin base or fin shapes
  • in case of heat expansion fins remain in contact with basic tubes which ensures permanently high rate of the heat coefficient transfer
  • fin base protects the tube from corrosion
  • this type of finning replaces bimetal finned tube with extruded fins
Type”G”
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  • max. working temperature up to 350 °C
  • fins imbedded in the basic tube
  • extremely high stability in relation to temperature oscillations and mechanical vibrations
  • the imbedding technology ensures compact, homogenous and firm contact with the basic tube, which considerably reduces resistance during heat exchange from tube to fins

STANDARD SIZES

FINS: TYPE “KL” AND “L”
Tube O.D. Fin height Strip thickness Number of fins
mm col mm mm per 1m per col
14,3 9/16″ 7,6 0,38 390 10
16 5/8″ 10,3 0,4 390 10
16 5/8″ 11,1 0,38 390 10
16 5/8″ 12,7 0,4 430 11
16 5/8″ 12,7 0,45 430 11
19 3/4″ 12,7 0,43 390 10
25,4 1″ 6,35 0,35 390 10
25,4 1″ 12,7 0,4 390 10
25,4 1″ 12,7 0,4 430 11
25,4 1″ 15,9 0,45 390 10
25,4 1″ 15,9 0,45 430 11
38 1 1/2″ 12,7 0,4 390 10
38 1 1/2″ 12,7 0,4 430 11
38 1 1/2″ 15,9 0,45 390 10
38 1 1/2″ 15,9 0,45 430 11
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FINS: TYPE “G”
Tube O.D. Fin height Strip thickness Number of fins
mm col mm mm per 1m per col
25,4 1″ 12,7 0,4 390 10
25,4 1″ 15,8 0,45 350 9
25,4 1″ 15,8 0,45 390 10
25,4 1″ 15,8 0,45 430 11
25,4 1″ 15,8 0,5 315 8
31,7 1 1/4″ 15,8 0,45 390 10
38 1 1/2″ 15,8 0,45 350 9
38 1 1/2″ 15,8 0,45 390 10
50,8 2″ 12,7 0,45 390 10
50,8 2″ 12,7 0,45 430 11
FINS: TYPE “LL”
Tube O.D. Fin height Strip thickness Number of fins
mm col mm mm per 1m per col
18 10 0,4 390 10
25,4 1″ 12,7 0,4 390 10
25,4 1″ 15,9 0,45 315 8
25,4 1″ 15,9 0,75 315 8
25,4 1″ 15,9 0,45 350 9
25,4 1″ 15,9 0,45 390 10
25,4 1″ 15,9 0,58 390 10
25,4 1″ 15,9 0,45 430 11
25,4 1″ 15,9 0,45 275 7
31,7 1 1/4″ 15,9 0,4 430 11
31,7 1 1/4″ 19 0,78 350 9
38 1 1/2″ 25,4 0,78 350 9
38 1 1/2″ 25,4 0,75 315 8
50,8 2″ 25,4 0,78 350 9

CONNECTION RINGS

All types of finned tubes are also available with interleaved connection rings made of zinc or aluminium, tightly bundling each single finned tube in a heat exchanger at projected arrangement.
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ORDERING INFORMATION

Inquiries for quotations should include following data:

Nature of the basic tube (material, standard, size), end use, finning material, working pressure and temperature, corrosion resistance, height and number of fins by meter of length or inch, number of finned tubes.

If possible, a drawing of finned tube should be enclosed, indicating sizes of non-finned tube parts.

Apart from named sizes, other tubes with outer diameters range as shown in tables can be finned as well.

Orders may indicate both metric and inch measuring units. As for connection rings, data on axial distance of tubing in bundle, their arrangement and supporting spots are required (in-line or „chess-like” layout).