Longitudinal Finned Tubes are special heat transfer components that have been developed in order to create an increased surface area while ensuring effective heat transfer under tough industrial conditions. The fins of such tubes are arranged longitudinally, thus creating an extended heat transfer surface which is required when it is necessary to work with controlled fluid flow and compact equipment. Longitudinal Finned Tubes are supplied in a range of base tube materials, fin profiles and sizes to match the exchanger design, and correct fin attachment and sizing are essential to reliable long term performance. Proper installation of fins and correct sizes ensure proper work of Longitudinal Finned Tubes throughout their lifetime. Amardeep Steel Centre manufactures and supplies Longitudinal Finned Tubes for industrial projects in India and international markets.
Technical Data
Specifications of Longitudinal Finned Tube
|
Parameter |
Standard Range |
|---|---|
|
Base Tube Outer Diameter (OD) |
19.05 mm to 273.0 mm |
|
Base Tube Wall Thickness |
1.65 mm to 12.7 mm (BWG 16 to BWG 3) |
|
Fin Height |
4.0 mm to 38.1 mm |
|
Fin Thickness |
0.8 mm to 1.5 mm |
|
Fin Count |
Always a multiple of 4 (e.g., 8, 12, 16, 24, 32, 40) |
|
Fin Profiles |
Plain I-Fin, U-Fin Channel, Perforated, Cut-and-Twist |
|
Maximum Length |
Up to 18.0 metres |
|
Welding Process |
Electric Resistance Welding (ERW / High Frequency) |
Chemical Compositions of Longitudinal Finned Tube
|
Material Grade |
Standard |
C (%) |
Mn (%) |
Si (%) |
P (%) Max |
S (%) Max |
Cr (%) |
Ni (%) |
Mo (%) |
Other (%) |
|---|---|---|---|---|---|---|---|---|---|---|
|
ASTM A179 |
Carbon Steel |
0.06 – 0.18 |
0.27 – 0.63 |
— |
0.035 |
0.035 |
— |
— |
— |
— |
|
ASTM A106 Gr B |
Carbon Steel |
≤ 0.30 |
0.29 – 1.06 |
≥ 0.10 |
0.035 |
0.035 |
≤ 0.40 |
≤ 0.40 |
≤ 0.15 |
Cu ≤ 0.40, V ≤ 0.08 |
|
ASTM A213 T11 |
Low Alloy |
0.05 – 0.15 |
0.30 – 0.60 |
0.50 – 1.00 |
0.025 |
0.025 |
1.00 – 1.50 |
— |
0.44 – 0.65 |
— |
|
ASTM A213 T22 |
Low Alloy |
0.05 – 0.15 |
0.30 – 0.60 |
≤ 0.50 |
0.025 |
0.025 |
1.90 – 2.60 |
— |
0.87 – 1.13 |
— |
|
ASTM A213 TP304L |
Stainless Steel |
≤ 0.030 |
≤ 2.00 |
≤ 0.75 |
0.045 |
0.030 |
18.0 – 20.0 |
8.0 – 12.0 |
— |
N ≤ 0.10 |
|
ASTM A213 TP316L |
Stainless Steel |
≤ 0.030 |
≤ 2.00 |
≤ 0.75 |
0.045 |
0.030 |
16.0 – 18.0 |
10.0 – 14.0 |
2.00 – 3.00 |
N ≤ 0.10 |
|
C44300 (Admiralty) |
Copper Alloy |
— |
— |
— |
0.06 |
0.06 |
— |
— |
— |
Cu: 70–73%, Sn: 0.9–1.2%, As: 0.02–0.06% |
|
CuNi 70/30 (C71500) |
Copper Nickel |
— |
1.00 Max |
— |
0.020 |
0.020 |
— |
29.0 – 33.0 |
— |
Cu: Remainder, Fe: 0.40–1.00% |
Longitudinal Finned Tube Mechanical Properties
|
Material Grade |
Tensile Strength (MPa) Min |
Yield Strength (MPa) Min |
Elongation (%) Min |
Hardness (Max) |
Service Temp Limit (°C) |
|---|---|---|---|---|---|
|
ASTM A179 |
325 |
180 |
35 |
72 HRB |
Up to 425°C |
|
ASTM A106 Gr B |
415 |
240 |
30 |
79 HRB |
Up to 425°C |
|
ASTM A213 T11 |
415 |
205 |
30 |
163 HBW |
Up to 550°C |
|
ASTM A213 T22 |
415 |
205 |
30 |
163 HBW |
Up to 580°C |
|
ASTM A213 TP304L |
485 |
170 |
35 |
90 HRB |
Up to 800°C |
|
ASTM A213 TP316L |
485 |
170 |
35 |
90 HRB |
Up to 850°C |
|
C44300 (Admiralty) |
310 |
105 |
35 |
75 HRB |
Up to 250°C |
|
CuNi 70/30 (C71500) |
360 |
125 |
30 |
75 HRB |
Up to 300°C |
Equivalent grades of Longitudinal Finned Tube
|
Material Family |
USA / ASTM Standard |
European / EN (DIN) Standard |
EN Material Number |
UK / BS Standard |
Japan / JIS Standard |
France / AFNOR |
|---|---|---|---|---|---|---|
|
Carbon Steel |
ASTM A179 |
P235GH |
1.0345 |
BS 3602 Gr. 360 |
ST35.8 / STB 340 |
TU 37-c |
|
Carbon Steel |
ASTM A106 Gr B |
P265GH / St45.8 |
1.0425 / 1.0405 |
BS 3602 Gr. 430 |
STS 370 / STPG 370 |
TU 42-c |
|
Alloy Steel |
ASTM A213 T11 |
13CrMo4-5 |
1.7335 |
BS 3606 Gr. 620 |
STBA 23 |
15 CD 4.05 |
|
Alloy Steel |
ASTM A213 T22 |
10CrMo9-10 |
1.7380 |
BS 3606 Gr. 622 |
STBA 24 |
12 CD 9.10 |
|
Alloy Steel |
ASTM A213 T91 |
X10CrMoVNb9-1 |
1.4903 |
BS 3606 Gr. 91 |
STBA 28 |
— |
|
Austenitic SS |
ASTM A213 TP304L |
X2CrNi19-11 |
1.4306 / 1.4307 |
BS 304S11 |
SUS 304L |
Z3 CN 18-10 |
|
Austenitic SS |
ASTM A213 TP316L |
X2CrNiMo17-12-2 |
1.4404 / 1.4435 |
BS 316S11 |
SUS 316L |
Z3 CND 17-11-02 |
|
Austenitic SS |
ASTM A213 TP321 |
X6CrNiTi18-10 |
1.4541 |
BS 321S31 |
SUS 321 |
Z6 CNT 18-10 |
|
Copper Alloy |
Admiralty C44300 |
CuZn28Sn1As |
2.0470 |
BS 2871 CZ111 |
JIS C4430 |
ZU 28 N1 |
|
Copper Nickel |
CuNi 70/30 (C71500) |
CuNi30Mn1Fe |
2.0882 |
BS 2871 CN106 |
JIS C7150 |
CuNi30Mn1Fe |
Applications and Industrial Uses of Longitudinal Finned Tube
- Double-Pipe Heat Exchangers
- Hairpin Heat Exchangers
- Fired Heaters
- Process Heaters
- Oil and Gas Heat Exchangers
- Petrochemical Process Equipment
- Waste Heat Recovery Systems
- Viscous Fluid Heating Systems
Frequently Asked Questions
What is a Longitudinal Finned Tube?
A Longitudinal Finned Tube is a heat transfer tube with fins attached parallel to the tube axis to increase the external heat transfer surface area.
How are Longitudinal Finned Tubes manufactured?
They are manufactured by attaching longitudinal fins to the outer surface of a base tube, commonly using resistance welding or other mechanical attachment methods.
What are Longitudinal Finned Tubes used for?
They are used in double-pipe heat exchangers, hairpin exchangers, fired heaters, process heaters, and heat recovery systems.
How do Longitudinal Finned Tubes improve heat transfer?
The longitudinal fins increase the available surface area, allowing more heat to transfer between the tube and surrounding fluid.
What is the difference between Longitudinal and Helical Finned Tubes?
Longitudinal fins run parallel to the tube axis, while helical fins wrap continuously around the tube in a spiral pattern.
Are Longitudinal Finned Tubes suitable for heat exchangers?
Yes, they are widely used in double-pipe, hairpin, and other heat exchanger systems where increased heat transfer area is required.
