ASTM A249 / ASME SA249 TP304 FINNED TUBE FOR AIR COOLER / HEAT EXCHANGER APPLICATION
A249/A249M-18a Standard Specification for Welded Austenitic Steel Boiler, Superheater, Heat-Exchanger, and Condenser Tubes
L Type Finned Tube for Heat Exchanger
L Type Finned Tube is a finned tube made of aluminum fin tape or copper fin tape folded into an L-shaped spiral under tension and wrapped tightly around the outer surface of the base tube.
The tension in the fin strips of the L Type Finned Tube wraps around the tube, causing the fin feet to press forcefully against the tube, holding the fins firmly in place. L Type Finned Tube is usually used in air coolers in petrochemical, power, paper, tobacco, building heating and other industries as well as heat exchangers in power plants (electricity, nuclear, thermal and geothermal power plants), the maximum operating temperature can reach 230°C.
L Type Finned Tube for Heat Exchanger Quick Details
Fin type: Solid plain
Fin Tube Type: L Type
Outer diameter (OD): 16mm Min~50.8mm max.
Tube length: up to 18,000 mm.
Fin height: 16.5mm max.
Fin thickness: generally 0.4mm~0.6mm
Fin pitch: 2.1mm minimum (12FPI)
Surface Protection: Both bare ends shall be zinc or aluminum metallized by electrospray arc system coating.
Accessories: Tube support boxes, clamps or spacer boxes (materials: aluminium, zinc and stainless steel).
Common Specifications of L Type Finned Tube for Heat Exchanger
All dimensions are in Inches and specification upon your requests | |||
Tube OD | Fin Height | Fin Thickness | Fins per Pitch |
5/8 | 3/8,1/2 | .015/.016/ .020 | 6, 7, 8, 9, 10, 11, 12 |
3/4 | 5/8,1/2 | .015/.016/ .020 | 6, 7, 8, 9, 10, 11, 12 |
1 | 5/8,1/2 | .015/.016/ .020 | 6, 7, 8, 9, 10, 11, 12 |
1 1/4 | 5/8,1/2 | .015/.016/ .020 | 6, 7, 8, 9, 10, 11, 12 |
1 1/2 | 5/8,1/2 | .015/.016/ .020 | 6, 7, 8, 9, 10, 11, 12 |
Manufacturing Process
Fin strips (usually aluminum and copper) are folded into an L shape and wound under tension on the surface of the base tube. The feet of the fins are connected together and cover the surface of the fins.
L Finned Tube is combined with two different materials. Core tube material: carbon steel, low alloy steel, stainless steel, brass, copper, copper-nickel alloy, aluminum bronze, nickel alloy.
Core Tube Material | |
Carbon Steel | A179, A192, SA210 Gr A1/C, A106 Gr B, A333 Gr3 Gr6 Gr8, A334 Gr3 Gr6 Gr8, 09CrCuSb, DIN 17175 St35.8 St45.8, EN 10216 P195 P235 P265, GB/T3087 Gr10 Gr20, GB/T5310 20G 20MnG |
Alloy Steel | A209 T1 T1a,A213 T2 T5 T9 T11 T12 T22 T91,A335 P2 P5 P9 P11 P12 P22 P91,EN 10216-2 13CrMo4-5 10CrMo9-10 15NiCuMoNb5-6-4 |
Stainless Steel Tube | TP304/304L, TP316/TP316L TP310/310S TP347/TP347H |
Copper | UNS12200/UNS14200/UNS70600, CuNi70/30, CuNi 90/10 |
Titanium | B338 Gr 2 |
Features of L Type Finned Tube
1. The trapezoidal section formed by the calendering of L Type Finned Tube for heat exchanger is consistent with the distribution of heat flow density, the tubes are tightly combined, and the thermal efficiency is high, which eliminates the contact heat caused by the gap between the tubes and the finned tube. resistance, the fin spacing is uniform, and the heat transfer performance is good.
2. The tube can withstand temperatures up to 150°C and there is no risk of atmospheric corrosion or thermal stress.
3. The L-type finned tube provides the contact area between the fin strip and the surface of the tube to protect the tube wall from atmospheric corrosion.
4. This L TYPE design is much more economical than LL, KL or even G-embedded types.
5. Maximum operating temperature: 230°C
Application of L Type Finned Tube
1. Highly corrosive systems (condenser, evaporator, desalination, fertilization, urea system, ammonia, gas, corrosive acid);
2. Air coolers in petrochemical, electric power, paper, tobacco, building heating and other industries;
3. Air heaters and air heaters for spray drying systems such as vegetable protein powder and starch in the food industry;
4. Heat Exchanger installations in power plants (electrical, nuclear, thermal and geothermal power plants).
