SA179 G Type Embedded Aluminum FINNED TUBE FOR HEAT EXCHANGERS, A179 Embedded Fin Tube ALUMINIUM FIN

Fin tubes are widely used in heat exchanger, electric power, metallurgy and other industries. Due to the high quality of our products, fast and punctual delivery, reasonable price and good after-sales service, our company has acquired the recognition of the industry and the trust of our clients.

Type G-Fin

 is a type of circumferentially finned tube where the fin is mechanically embedded into a groove that is ploughed into the tube and locked into place by rolls that force the groove to tightly close around the fin base.

Embedded Fin Tubes

G type Finned Tubes

G type embedded spiral finned tube is processed from a certain width in the steel pipe and spiral groove depth, then inlays the ribbon on the steel pipe by the equipment. In winding process, as the pre-tightening force to a certain extent so the strip will be firmly in the spiral groove, to ensure there is a certain contact area between steel band and steel pipe. In order to prevent the strip spring falling off the light tube, the two ends of the steel strip need to weld onto the steel pipe. In order to set easily, there should be a certain clearance between steel belt and spiral groove. If the clearance is too small the setting process will be difficult to proceed smoothly. In addition, the steel belt of winding there will always be a certain amount of rebound, which makes it cannot very good joint among the steel belt and spiral groove bottom. Inlaid fins can be conducted on general equipment, and they cost little. McElroy companies in the United States the company I used the advanced production equipment, slotting embedding technology is advanced, from stable, embedded and firm, pulled off force not less than 70 n, the allowable temperature can reach 400 ℃, has the strong ability of temperature resistance and thermal shock, widely used in petrochemical air cooler.

Fin Tubes Information:

ASTM A179 G Embedder aluminum fin tubes (For example)

G type fin tube, also known as embedded finned tube, where g means slotted. It is formed by screwing fin strips made of copper or aluminum into machined grooves and backfilling to secure the lock. Fill the base tube material. Compared with other finned tubes, G type fin tubes are firmer. Therefore, it is widely used in places where high-temperature heat transfer is required.

The G type fin tube is a circumferential finned tube in which the fin is mechanically embedded in the groove, the groove is plowed into the tube, and the roller is locked in place, thereby forcing the groove to tightly surround the fin base.

The aluminum fin strip is wound and embedded in the groove, and is firmly locked by closing the groove with the bottom tube metal. This ensures maximum heat transfer at high temperatures.

The maximum operating temperature of G fins is 450 degrees Celsius. Commonly used heat sink materials are aluminum (or) copper, pipes-carbon steel, stainless steel, copper, copper alloys, etc.

G Type Embedded 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.
1. Carbon steel: A179, A192, SA210 Gr A1/C, A106 Gr B
2. Stainless steel: TP304/304L, TP316/TP316L/316Ti, A789 S31803/S2205
3. Copper: UNS12200/UNS14200/UNS70600, CuNi70/30, CuNi 90/10
Fin material:
1. Aluminum (Alu.1100, Alu.1060)
2. Copper.
3. Steel

G type fin tube manufactruring process
Specifically, the G type fin tube is a spiral groove with a certain width and depth that is pre-processed on the steel tube, and then the aluminum strip is inlaid on the steel tube on the equipment. During the winding process, due to a certain pre-tightening force, the steel strip will be tightly pinched in the spiral groove, thus ensuring a certain contact area between the steel strip and the steel pipe.

In order to prevent the steel strip from rebounding and falling off, both ends of the steel strip should be welded to the steel pipe. In order to facilitate the inlay, there should be a certain backlash between the steel strip and the spiral groove. If the backlash is too small to form an interference, the inlay process is difficult to proceed smoothly.

In addition, the wound steel belt will always have a certain rebound, as a result, the steel belt and the bottom surface of the spiral groove cannot be well joined. Inlay fins can be carried out on general equipment, and the cost is not high.

G type fin tube processing requirements

Embedded depth and stability
1.1 Pull-off force test: more than 8kg or the aluminum strip is torn

1.2 Mosaic depth: 0.35~0.5 according to the wall thickness of the furnace tube

1.3 Mounting stability: the first pull-off test specimen of each class meets the requirements of 1.1

1.4 The embedded tube is made of stainless steel and carbon steel, and the wall thickness of the pipe shall not be less than 2mm

1.5 The diameter of the inlaid pipe is dn20~38 (the British American standard is based on 1.5 requirements)

1.6 No cracks or cracks on the surface of the pipe after inlay

1.7 The height of the inlaid piece is calculated based on the diameter of the pipe-generally half of the diameter of the pipe, but not higher than 57 plus or minus

G type fin tube product size accuracy
2.1 The overall length of the wing segment -5mm ~ +5mm, segmental motion accuracy -0.3mm ~ +0.4mm

2.2 Film pitch +0.21mm or more

2.3 Verticality of fin and steel pipe -1 degree ~ +1 degree

2.4 Mounting flatness -0.1mm ~ +0.1mm except for the height difference caused by the thickness tolerance of the fin itself

2.5 Mounting height difference -0.1mm ~ +0.1mm Except for height difference caused by fin size tolerance

2.6 Under the same steel tube material, the same spacing and number of fins, the length of the different fin tubes after inlaying is the same.