Product Name:Heat Exchange Finned Tube for Heat Exchanger
Demension:Base Tube OD: 5/8"(15.88mm) to 2"(50.8mm)
Fin Height: 1/4"(6.35mm) to 1"(25.4mm)
Fin Pitch: 5 Fins Per Inch to 12 Fins Per Inch(196 Fins/Metre to 473 Fins/Metre)
Fin Thickness: 0.012"(0.30mm) to 0.031"(0.76mm)
Material:Titanium,Nickel,Carbon Steel,Stainless Steel
Applications:Our fin tubes are widely used in oil refineries, petrochemical
plants, power generating stations, and fertilizer and gas production plants.
| Name | fin tube / finned tube / finned pipe |
| Type | 1.Extruded fins tube
2.Serrated fin tubes
3.L Type fins tube
4.G Type fins tube
5.LL Type fins tube
6.H Type fins tube
7. KL Type fins tube |
| Base Tube Material: | stainless steel, carbon steel, etc. |
| Material of the fin and tube | Maximum operating temperature for extruded finned tube is 325 deg C
*Fin Material - Aluminium (or) Copper
*Tube Material - No theoretical limit |
| Base tube O.D: | 15.88-50.8mm |
| Fin Pitch: | 5 Fins Per Inch to 12 Fins Per Inch(196 Fins/Metre to 473 Fins/Metre) |
| Fin Height: | 6.35-25.4mm |
| Fin thickness: | 0.3-0.76 |
| Product processing | Extrusion,Embedded,etc. |
| Product origin | China |
| Ends | PE, BE. |
| Trade terms | FOB, CIF |
| Delivery | Container, LCL |
Fin Types:
| Product Name | Material | Dimension | Manufacture | Application |
G Fin
(Embedded Fin) | Fin materials:
Aluminium
Base tube materials:
Any readily machinablematerial | | A helical groove is formed in base tube displacing of material and
fin is wound into the groove under tension followed by backfilling
of the displaced material to lock the fin root into the tube. | High-efficiency fin for high operating temperatures
Upper limiting temperature: 400°C |
L Fin
(Wrapped Fin) | Fin materials:
Aluminium
Base tube materials:
Any metallic
material | | Fin foot is preformed into L shape andapplied to base tube under
tension. The adjacent fins abut one another giving a degree of
base tube protection for less aggressive environments. | Standard fin for low-temperature application
where some degree of tube wall protection is required
Upper limiting temperature:120°C |
LL Fin
(Overlapped L Fin) | Fin materials: Aluminium
Base tube materials:
Any metallic material | | Fin foot is preformed into an LL shape (overlapped LL) and applied to
base tube under tension. However, foot is preshaped to give overlap of one foot onto
another thereby improving base tube protection and thermal contact area. | Standard fin for low-temperature applications
giving increased atmospheric corrosion protection of the
base tube
Upper limiting temperature:180°C |
K Fin
(Knurled L Fin) | Fin materials: Aluminium
Base tube materials:
Any metallic material | Standard dimensions of applied fin tubes:
Base tube dia. (mm):
25.4, 31.8, 38.1, 50.5, 50.8
Fin height (mm): 9.5, 12.7, 15.88
Fin pitch: 236 to 433 fins/metre | Fin foot is preformed into an L shape and applied to base tube under tension.
Knurling tools both precede and follow the laying down of the fin foot so that the
fin material is locked into the preknurled tube. This gives up to 50% greater
thermal contact area than standard L fin and also ensures an airtight fin to
tube bond, resulting in greater tube protection. | Standard fin for medium temperature applications, giving increased atmospheric corrosion
protection to the outer surface of the base tube
Upper limiting temperature: 250°C |
Extruded Fin
(Bi-metallic Fin) | Fin materials: Aluminium
Base tube materials:
Any metallic material | Standard dimensions
of extruded fin tubes:
Base tube dia. (mm):
25.0, 25.4, 31.8, 38.1
Fin height (mm): 15.88
Fin pitch: 354, 393, 433 fins/metre | A carefully degreased core tube is fitted into an aluminium primary tube. This
assembly is then fed into the triple-spindle finning head of the fin-extruding machine.
Three special multidisc packs extrude the aluminium tube into helical high fins while reducing
the inner diameter to give firm pressure contact with the core tube. | High-efficiency fins for higher temperature
applications giving complete and permanent atmospheric
corrosion protection of the base tube. Using over 40% more
aluminium than the equivalent applied fin the extended fin is
very robust and resistant to mechanical damage, allowing
the finned tubes to be cleaned without damage using either
steam or high-pressure water
Upper limiting temperature: 300°C |
Questions&Answers:
What Type of Fin Should I Use?
The choice between Aluminum L-foot and the welded finned tubes (helical and longitudinal) is usually clear -aluminum L-foot finned tubes are generally used in air-cooled applications with service temperatures below 400 degrees F. Within the aluminum L-foot category, the choice between solid fin and perforated fin is less clear, and depends upon whether you want
to take advantage of the improved heat transfer efficiency claimed for perforated fin.
Within the welded fin types, our experience with customers indicates that the choice between helical fins and
longitudinal fins generally depends on the direction of fluid flow across the fins, with the objective of having the
fluid pass between the fins, rather than across the fins. For example, in the case of a tank heater, fluid flow is
caused by convection currents within the tank -- as the fluid next to the finned tube is heated, it rises vertically, and the colder fluid near the top of the tank
drops vertically. Therefore if a tank heater is to be installed with the finned tubes oriented vertically, Longitudinal Finned Tube may be the best choice, since the rising fluid will pass in a direction parallel to the longitudinal axis
of the tube, and between the fins. However if the heater is to be installed horizontally, helical fins may be the best choice, since the fluid flow would be perpendicular to the axis of the tube, and between the helical fins.
If the choice is for welded helical finned tubes, a further decision is required -- Helical Solid or Helical Serrated?
- For some tube/fin configurations, helical serrated gives greater surface area than solid, and for other tube/fin
configurations the reverse is true. A comparison of surface area may be made by using the tables included in
Design Info.
- A definite advantage of helical serrated is that for a given pipe size, a greater fin height can be used for
serrated than for solid. This is because the serrations, or cuts, in the fin strip allow a greater fin strip width to be
formed around a given size tube without significant deformation of the fin.
- It has been claimed that helical serrated offers an advantage over helical solid, particularly for lighter fluids, in
that the serrated segments allow some lateral (cross-fin) flow of fluid along the tube axis, which serves to increase turbulence, thereby breaking up the thermal
boundary layer and increasing heat transfer efficiency; and also slows the formation of fouling deposits between
fins.
The decision which type of fin to use is yours -- Metalli stands ready to provide any type of finned tube you need.
Why Use Finned Tubes?
Finned tubes are used in applications involving the transfer of heat from a hot fluid to a colder fluid through a
tube wall. The rate at which such heat transfer can occur depends on three factors: (1) the temperature
difference between the two fluids; (2) the heat transfer coefficient between each of the fluids and the tube wall;
and (3) the surface area to which each fluid is exposed. In the case of a bare (unfinned) tube, where the outside surface area is not significantly greater than the inside surface area, the fluid with the lowest heat transfer
coefficient will dictate the overall heat transfer rate. When the heat transfer coefficient of the fluid inside the tube is several times larger than that of the fluid outside the tube (for example steam inside and oil outside), the
overall heat transfer rate can be greatly improved by increasing the outside surface area of the tube. In
mathematical terms, the product of heat transfer coefficient for the outside fluid multiplied by outside surface area is made to more closely match the product of the inside fluid heat transfer coefficient multiplied by tube inside
surface area.
So the whole concept of finned tubes is to increase outside surface area. As an example, a common finned tube configuration of 2" (nominal) pipe with 3/4" high welded helical solid fins of 12 gauge thickness with 6 fins per inch has an outside surface area of 8.23 sq. ft. per linear foot; whereas the same bare pipe has an outside surface
area of only 0.62 sq. ft. per linear foot. (See Design Info for extensive tables of surface areas and fin weights.)
The advantage of finned tubes is that by increasing overall heat transfer rate, the total number of tubes required for a given application is reduced, thereby also reducing overall equipment size and decreasing the cost of the project. In many application cases, one finned tube replaces six or more bare tubes at less than 1/3 the cost and 1/4 the volume.
What Materials Are Used for Finned Tubes?
For Aluminum L-Foot finned tubes, the fin material is aluminum, either 1100-0 or 5005. The tube material is generally carbon steel, stainless steel, or brass; however the tube can be of any material.
For Welded Helical Solid and Welded Helical Serrated finned tubes, the fin and tube materials can be any
combination that can be welded together using the GMAW (gas-metal-arc-welding) process.
For Welded Longitudinal finned tubes, the fin and tube materials can be any combination that can be resistance welded together.
The materials chosen for a given application are a function of service temperature, corrosive environment, and/or erosive environment. Common tube materials used for our welded product lines include: carbon steel, carbon
moly, chrome moly, stainless steel, Inconel, and Incoloy. Common fin materials include: carbon steel; stainless
steels of types 304, 310, 316, 321, 409, and 410; Nickel 200, and Inconel.
Our Service:
Advantage
1.High quality
1st class materials, rigid production management and strict testing make sure the good quality of the goods.
2.Competitive price
Advanced production line and cost control make our price competitive.
3.One-stop service
All related fittings can be find here.
4.Experienced supplier
12 years working and export experience can meet your diverse needs.
5.International standard
Do not worry about the size because we strictly follow the International harmonization of standards.
Contact Information:
Name:Tammy Qian
Tel:86-512-88838532
Mobile:+86-133 7213 7951
Fax:86-512-88838530
Web:http://henghongtitan.en.made-in-china.com
