Longitudinal Finned Tubes ASTM A179 Heat Exchanger Tubes With Carbon Steel Fins
Definition
Longitudinal finned tubes are produced by resistance welding fins along the long direction of the tube. The fins first form a U-shaped channel so that each leg of the U-shape forms a fin. The channel is cut to the appropriate length, then oriented along the length of the tube and resistance welded in place. The channels are pairs of soldered, diametrically opposed, so the number of fins specified must be a multiple of four.
Regular base pipe/tube material: carbon / alloy steel (A106, A333, A179, A335 P5, P22, P9, etc.)
stainless steel TP304, TP316L,TP321, etc.
copper alloy CuNi 70/30, CuNi 90/10, etc and other material.
Regular fins material: carbon steel, stainless steel, alloy steel, copper alloy, etc.
Detailes of ASTM A179 Base Tubes
This specification covers minimum-wall-thickness, seamless cold-drawn low-carbon steel tubes for tubular heat exchangers, condensers, and similar heat transfer apparatus.This specification covers tubes 1⁄8 to 3 in. [3.2 to 76.2 mm], inclusive, in outside diameter.
Manufacture: tubes shall be made by the seamless process and shall be cold drawn.
Heat treatment:tubes shall be heat treated after the final cold draw pass at a temperature of 1200°F [650°C] or higher.
Surface Condition: finished tubes shall be free of scale. A slight amount of oxidation will not be considered as scale.
Tests: Flattening Test, Flaring Test, Flange Test, Hardness Test, Hydrostatic Test
Chemical Composition (%)
| Grade | C | Mn | P | S |
| A179 | 0.06-0.18 | 0.27-0.63 | 0.035 | 0.035 |
Mechanical Properties
| Grade | Tensile Strength,min | Yield Strength (0.2%Offset,min) |
| A179 | 47ksi (325 MPa) | 26ksi (180 MPa) |
| Elongation min. | Hardness, max | ... |
| 35% | Rockwell: 72 HRB | ... |
Advantages
1.Improve the heat transfer efficiency in the effective space;
2.Reduce the installation space of the required heat transfer surface and at the same time, it has high reliability;
3.Heat transfer is strengthened to reduce flow resistance and metal consumption,etc.
Application
Generally applicable to power stations or large high-temperature old equipment in the oil industry:
Boilers
Furnaces
Economizaers
Combustion Heater
Big Air Cooler,etc.
Heat Exchangers,Shell and Tube Bundles
Specifications For Various Types Of Finned Tubes
| Type | Description | Base tube | Fin specification (mm) |
| O.D. (mm) | Fin pitch | Fin height | Fin thick |
| Embedded | G-type fin tube | 16-63 | 2.1~5 | <17 | ~0.4 |
| Extruded | Single metal / Combined metal | 8-51 | 1.6~10 | <17 | 0.2-0.4 |
| Low fin tube / T-type fin tube | 10-38 | 0.6~2 | <1.6 | ~0.3 |
| Bamboo tube / corrugated tube | 16-51 | 8.0~30 | <2.5 | ~0.3 |
| Wound | L / KL / LL type fin tube | 16-63 | 2.1~5 | <17 | ~0.4 |
| String | String fin tube | 25-38 | 2.1-3.5 | <20 | 0.2-0.5 |
| U-type | U-type fin tube | 16-38 | / | / | / |
| Welding | HF-welding fin tube | 16-219 | 3~25 | 5~30 | 0.8-3 |
| H/HH type fin tube | 25-63 | 8~30 | <200 | 1.5-3.5 |
| Studed fin tube | 25-219 | 8~30 | 5~35 | φ5-20 |
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Longitudinal Finned Tubes ASTM A179 Heat Exchanger Tubes With Carbon Steel Fins Images
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