G embedded fin tubes

G embedded fin tubes (with aluminum fins)
The fin strip is wound into a mechanically produced groove and tightened by backfilling of the base material under pressure. Groove depth 0.4 mm.

G embedded fin tubes: The fin strip is wound into a mechanically produced groove and tightened by backfilling of the base material under pressure. Groove depth 0.4 mm. Advantages: High fin stability, excellent heat transfer, high operating temperature.

Manufacturing process
The manufacturing tool is made up of 2 non-cutting plates set at 90° to the axis of the base tubes (pipes) (core tube).The first plate effects a groove for metal spinning. The second directs the ribbon in the groove and sets the fin foot in the groove through pressure on the metal displaced for the groove. A similar plate made of tungsten carburate allows us to manufacture. G embedded fin tubes ( fin tubes )with base tubes (pipes) (core tube) made of austenitic steel or exotic alloys.

Advantages
1) Thermal The fin/tube wall contact is constant because of the setting and makes it possible to use a wall temperature of up to 400° C.
2) Mechanical The fin is set throughout its length and consequently does unwind even when partially uprooted.

Material Combinations
Core Tube: Carbon steels (ASTM A 179, St35.8,etc.), low-alloy steels, stainless steels, copper-nickel alloys, aluminum bronze, copper, nickel-alloys(Alloy 400, ext.),
Fins:Aluminum ASTM B209 Al1060, Al1100, A1050, etc.

Maximum operating temperature for this fin type is 450° C.

G type embedded fin tubes machine is designed by ourself based on international advanced technologies and experience with stable and firm slotting embedding technology, pulled off force not less than 70 N, medium allowable temperature of 450 ℃, with strong resistant and heat-resistant ability, widely used in the impact of petrochemical refining air condenser.

Extruded fin tubes

fin type: Extruded fin tubes (fin tubes)- extruded fin tubes (fin tubes)s and many special sizes extruded fin tubes (fin tubes). extruded fin tubes (fin tubes) has the advantages of high efficiency, strong corrosion resistant and long life as the International, technologically advanced heat transfer element.

The base tubes (pipes) (core tube) of double extruded fin tubes can be stainless steel, carbon steel, corrosion resistant steel, copper and copper alloys, Ti and Ti alloys and the other materials. The base tubes (pipes) (core tube) of single extruded fin tubes can be copper, Nickel-copper, Aluminum and the other materials.

These products are widely used in petroleum, chemical, metallurgy, textile, mechanical and electrical, light industry and pharmaceutical industries in the heating, drying, condensation and cooling equipments.

Applications and characteristics
Working temperature ≤350°C
working pressure ≤32MPa
High heat transfer performance, same with KL type (Knurled "L"). Good fins stiffness, against deformation high atmospheric corrosion resistance for long term stable usage.

H/double H fin tubes

Steel H
Pairs of parallel shaped steel fins are resistance welded to the single pressure tubes (pipes) surface under very carefully controlled conditions.The purpose build welding machine ensures very precise indexing along the entire length of the tubes (pipes) and exact parallel attachment.

Double H h, double H / double H fin tubes
A development of the single tubes (pipes) version, the 'Double H' design has the steel fins welded onto two tubes at the same time. For applications with cleaner gases the use of 'Double H' can reduce the number of supports required due to its inherent stiffness.

Configurations
As a general guide, spacing of tubes (pipes) centres is usually in the range of 2-3 times the tubes (pipes) O/Dia.
. tubes (pipes) O/Dia. [OD] mm - 31.8 to 57.2
. tubes (pipes) Length [L] Metres - Up to and including 18 Metres maximum
. Vertical Centres [V] mm - 65 to 133
. Horizontal Centres [H] mm - 65 to 178
. Fin Thickness [t] mm - 2.0, 2.5, 3.0 (certain fin shapes can be 1.5mm thick material)
. Fin Density [P] mm - Minimum 10mm, i.e. 100 Fins Per Metre (FPM)
. Fin Shape - Over 75 fin shapes as standard, with new fin shapes continually being developed.
Bespoke fin shapes are produced to suit the design application where feasible.

Base tubes (pipes) Material
Typically Carbon, Corten, Low alloy steels.
Tubes quality / type can be Cold Drawn Seamless [CDS], Hot Finished Seamless [HFS], Electric Resistance Welded [ERW].

Fin Material
Carbon Steel Hot Rolled [HR4], Corrosion resisting steels i.e. Corten, 09CrCuSb.

Inner finned tubes

Inner fin tube has high efficient extends surface in heat exchanger tube, improving heat exchange property by strengthening heat transfer in the tube, Inner fin is corrugated and the coefficient of heat transfer and can be increased 7~8 times comparing with bare pipe. The inner finned tubes is made of tube and fins by nickel brazed welding with 100% welding rate.
inner finned tubes is able to improve more than 7 times in heat transfer area, also with good shock resistance and high strength, while its volume is much smaller which make cost much down in produtions of heat exchanger and usage by big down in circle water.inner finned tubes

Out tube OD 28mm
Inner tube OD 14mm
fin thickness 0.2mm

Hot dipped galvanized oval (elliptical) finned tubes, rectangular fin tubes

Hot dipped galvanized oval (elliptical) finned tubes, rectangular fin tubes (fin tubes) is by setting up rectangular or square-shaped fins over oval tube.
This fin tubes (pipes) maximizes the performance of Heat Exchangers and minimizes the loss of heat transfer and pressure.