Method
Before winding, the fin strip material is formed by rollers to "crimp" the fin.
The strip is then helically wound under tension onto the surface of the tube. Due to the "wave" form on the edge of the formed strip, the resulting effective increase in contact length ensures a good mechanical (and therfore thermal) contact between fin and tube.
Both ends of the spiral fin are either welded or brazed to the tube to prevent any possibility of unwinding.
Uses
For many years, the Crimped Fin Tube has proven to be the most effective and economical element used for space heating due to the large surface area per linear foot obtained in the crimping process.
Sizes
The sizes shown in the table below are the most common pipes found in Space Heating Systems.
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| Pipe Size IPS
|
Fin Size
|
Diameter
Over Fins
|
Fin
Spacing
|
Surface Area
FT2/lin. FT.
|
External Surface
/ Internal Surface
|
Approx. Weight
Per Ft. (Lb)
|
| 3/4"
|
.065
x 3/4"
|
2-1/2"
|
7/16"
3/8"
|
2.51
2.85
|
11.7
13.3
|
2.7
2.85
|
| 1"
|
.065
x 3/4"
|
2-13/16"
|
7/16"
3/8"
|
2.80
3.20
|
10.2
11.6
|
3.25
3.5
|
| 1 1/4"
|
.065
x 3/4"
.036
x1"
|
3-1/8"
3-5/8"
|
7/16"
3/8"
5/16"
1/4"
|
3.25
3.72
4.18
7.96
|
9.0
10.3
11.6
22.0
|
4.5
4.8
5.1
5.8
|
| 1 1/2"
|
.065
x 3/4"
.036
x 1"
|
3-3/8"
3-7/8"
|
7/16"
3/8"
5/16"
1/4"
|
3.50
4.00
4.50
8.54
|
8.3
9.5
10.7
20.2
|
5.0
5.3
5.6
6.7
|
| 2"
|
.065
x 3/4"
.036
x1"
|
3-7/8"
4-3/8"
|
7/16"
3/8"
5/16"
1/4"
|
4.13
4.71
5.30
9.69
|
7.6
8.7
9.8
17.9
|
6.6
7.0
7.4
8.2
|
| 2 1/2"
|
.065
x 3/4"
.036
x 1"
|
4-3/8"
4-7/8"
|
7/16"
3/8"
5/16"
1/4"
|
4.65
5.31
5.98
11.02
|
7.2
8.2
9.3
17.1
|
|
| 3"
|
.065
x 3/4"
|
5"
|
7/16"
3/8"
5/16"
|
5.36
6.11
6.88
|
6.7
7.6
8.6
|
11.4
11.9
12.5
|
