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Integral Low Fin Tube
Nov 04, 2018

Low Fin (Integral) tubing is a type of extruded tubing that consists of small low fins. The low fin tube is very similar to the extruded "high fin" types but these tubes have the same diameter as the base tube. Low Fin Enhanced tubes can be used in standard shell and tube baffles and tube sheets. The primary advantage for the low fin tube is providing surface enhancement and better heat transfer over smooth tubing.

During the manufacturing process, fin material is tightly wound around the outside of the tube to secure metals-to-metal contact of the base of the fin with the tube.

Integral Low Fin Tube has the advantage that it can improve the thermal performance of a Heat Exchanger without the necessity for changing shell size, flow arrangement or the repositioning of piping. The external surface of the tube is increased by the formation of “low fins” by direct extrusion from the material of the base tube.

Advantage

Fine-Fin provides 2.5 to 3 times the external surface area of bare tube

This yields numerous benefits for the heat transfer equipment

Reduced capital cost for new equipment

Enhanced heat exchange efficiency means less Fine-Fin tubing is required to accomplish the same heat transfer as a bare tube.

Reduced retrofitting cost for existing equipment

Fine-Fin can increase the performance of an existing heat exchanger without the difficult and expensive task of building new shells, heads, nozzles, piping and foundations.

Space, weight & structural savings

Reduced plot space and weight can be extremely valuable in offshore production or high elevation distillation columns. Fine-Fin technology transforms large shell & tube exchangers into compact heat exchangers.

More materials & alloys to select

Fine-Fin is available in a wider range of alloys than traditional low-fin tubing which is restricted to soft metals. This opens a new world of opportunity for enhanced tubing in corrosive service. The more expensive the tube material, the more dramatic the cost savings of Fine-Fin.

Reduced maintenance & life cycle cost

Proper material selection with Fine-Fin can eliminate costly downtime & maintenance. Example: Coastal refineries using once-through seawater cooling systems can benefit by substituting conventional copper nickel tubing with Titanium Fine-Fin tubing. Titanium Fine-Fin is highly resistant to seawater corrosion erosion.

Application

The Inegral Low Fin Tube are widely used in chemicalprocess. Especially applicable between air or other gases on the fin-side and a fluid on the tube-side.

When to Consider Integral low fin tube.

Shell side heat transfer is controlling.

Expensive materials of construction are required.

Debottlenecking an existing exchanger.

Retrofitting or upgrading with new tube material.

Meeting a stringent space or weight requirement.

 Integral Low Fin Tube

Fin Tube meets the following quality standards

ASTM B891 Seamless and Welded Titanium and Titanium Alloy Condenser and Heat Exchanger Tubes With Integral Fins

ASTM A1012 Seamless and Welded Ferritic, Austenitic and Duplex Alloy Steel Condenser and Heat Exchanger Tubes with Integral Fins

ASTM B924 Seamless and Welded Nickel Alloy Condenser and Heat Exchanger Tubes with Integral Fins

ASTM B359 Copper and Copper Alloy Seamless Condenser and Heat Exchanger Tubes with Integral Fins.

General Dimensions – Low Fin Tube Smooth Bore

<td "="" style="box-sizing: border-box; padding: 8px; line-height: 1.42857; vertical-align: top; border-style: solid;">Plain Section   avg. OD

28 FPI 0.889mm average fin height 0.305mm average fin thickness
No.Plain section avg. wallWall Under fin avgWall Under Fin Min.Nominal Root ODFin Section
ID
Outside Area AoInside Area
Ai
Area Ratio Ao/AiID cross Section Area
15352815.881.4730.8890.78714.09712.3190.1260.0393.2521.192
15422815.881.6511.0670.94014.09711.9630.1260.0373.3581.124
19282819.051.2450.7110.63517.27215.85-0.1530.0503.0741.973
19352819.051.4730.8890.78717.27215.4940.1530.0493.1310.292
19422819.051.6511.0670.94017.27215.1380.1530.0483.2121.800
25352825.401.4730.8890.78724.62221.8440.2060.0693.0043.748
25352825.401.6511.0670.94024.62221.4880.2060.0673.0593.627

 

30 FPI 0.813mm average fin height 0.279mm average fin thickness
No.Plain Section   avg. ODPlain section avg. wallWall Under Fin avg.Wall Under Fin Min.Nominal Root ODFin Section
ID
Outside Area AoInside Area
Ai
Area Ratio Ao/AiID cross Section Area
15353015.881.4730.8890.78714.24912.4710.1250.0393.1861.222
15423015.881.6511.0670.94014.24912.1160.1250.0383.2881.153
19283019.051.2450.7110.63517.42416.0020.1520.0503.0302.011
19353019.051.4730.8890.78717.42415.6460.1520.0493.1061.923
19423019.051.6511.0670.94017.42415.2910.1520.0483.1651.836
25353025.401.4730.8890.78723.77421.9960.2050.0692.9563.800
25353025.401.6511.0670.94023.77421.6410.2050.0683.0093.678

 

36 FPI 0.66mm average fin height 0.305mm average fin thickness
No.Plain Section   avg. ODPlain section avg. wallWall Under Fin avg.Wall Under Fin Min.Nominal Root ODFin Section
ID
Outside Area AoInside Area
Ai
Area Ratio Ao/AiID cross Section Area
15353615.881.4730.8890.78714.55412.7760.1250.0403.1141.282
15423615.881.6511.0670.94014.55412.4210.1250.0393.2111.212
19283619.051.2450.7110.63517.72916.3070.1520.0512.9762.088
19353619.051.4730.8890.78717.72915.9510.1520.0503.0491.998
19423619.051.6511.0670.94017.72915.5960.1520.0493.1061.910
25353625.401.4730.8890.78724.07922.3010.2050.0702.9173.906
25353625.401.6511.0670.94024.07921.9460.2050.0692.9693.783

General Dimensions – Low Fin Tube with Internal Rib

28 FPI 0.89 average fin height 0.305mm average fin thickness 0.254 average rib height
No.Plain Section   avg. ODPlain section avg. wallWall Under Fin avg.Wall Under Fin Min.Nominal Root ODFin Section
ID
Outside Area AoInside Area
AI
Area Ratio Ao/AiID cross Section Area
192828-20104619.051.2450.7110.63517.27215.8500.1530.0592.5691.961
193528-20104619.051.4730.8890.78717.27215.4940.1530.0582.6231.871

 

36 FPI 0.66 average fin height 0.305mm average fin thickness 0.254 average rib height
No.Plain Section   avg. ODPlain section wallWall Under Fin avg.Wall Under Fin Min.Nominal Root ODFin Section
ID
Outside Area AoInside Area
AI
Area Ratio Ao/AiID cross Section Area
192536-20104619.051.245avg.0.6350.55917.72916.4590.1520.0622.4632.116
192836-20104619.051.245 min0.7110.63517.72916.3070.1520.0612.4882.007

 


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