Oval fin tubes

Oval fin tubes

Oval fin tubes are specialized components used extensively in heat transfer applications across various industries.

These tubes are characterized by their unique oval shape and fins spirally wound around them, significantly enhancing heat transfer efficiency.

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What is an Oval Finned Tube?

The oval finned tube is a type of heat exchanger that consists of an oval base tube and outer rectangular fins. Examples include oval rectangular finned tubes, oval-oval finned tubes, oval circular finned tubes, spiral oval flat tubes, and oval H-shaped finned tubes. Oval finned tubes are gaining popularity due to their superior performance compared to round finned tubes and are widely used in industries such as ethylene production and oil refining.

Types and Advantages of Oval Finned Tubes

Oval finned tubes serve as efficient heat exchange elements, offering several advantages:

Oval fin tubes

Variations in Finned Tubes

Finned tubes can vary based on the installation position and arrangement of fins:

While round finned tube heat exchangers dominate the market, research shows that oval tubes are more effective at reducing air side flow resistance and energy consumption.

All Kind of oval fin tubes material can be applied for this type of fins.

Fin spec can be changed follow with client requirement.

Applied Temperature: 850C(1593 F)

This is for Air Cooled Oil Cooled Heat Exchanger, Condenser, Heater in field of Oil Refinery, Petrochemical Industry Offshore and Power plants.

Small diameter cut to length tubes

The configurations of finned round and flat tube heat exchanger. (adopted from [99]). (a) In-line classic tube shape, (b) Staggered classic tube shape, (c) In-line flat tubeand (d) Staggered flat tube.

Benefits of Oval Fin Tubes

  • Enhanced Heat Transfer: The oval design and spiral fins significantly increase the surface area, resulting in better heat transfer performance.
  • Compact and Efficient: Allows for a larger heat exchange surface area within a smaller footprint, making the system more efficient and compact.
  • Reduced Pressure Loss: The design can lower the refrigerant pressure loss by more than 50%, making systems more energy-efficient.
  • Durability: Suitable for high-temperature and high-pressure applications, providing long-term reliability and performance.
  • Versatility: Applicable in a wide range of industries and customizable to meet specific operational needs.

Applications

  • Air-Cooled Heat Exchangers: Used in cooling applications where the ambient air is used for heat dissipation.
  • Condensers and Heaters: Common in the HVAC industry, improving efficiency in heating and cooling systems.
  • Oil Refinery and Petrochemical Industry: Utilized in various processes requiring efficient heat transfer.
  • Power Plants: Used in steam turbine flue gas condensation, condenser water contact cooling, and auxiliary heat exchange systems.
  • Steel Industry: Integral to blast furnace and converter systems.
  • Waste Incinerators and Compressor Coolers: Enhances the heat exchange process in these high-stress environments.

Material

We offer you a broad portfolio of materials and can expand our offerings at any time to meet your specific needs regarding thermal conductivity, mechanical properties, or corrosion resistance.

For Aluminum L-Foot finned tubes, the fin material is aluminum, either 1100-0. 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 HIGH FREQUENCY WELDING process.

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.

Carbon steel fins are available on carbon, stainless steel, or copper tube. Please call for a specific size if not listed

We offer you a broad portfolio of materials and can expand our offering at any time to meet your specific needs regarding thermal conductivity, mechanical properties, or corrosion resistance.

Core Tube Material

Material Grade
Carbon Steel Tubes 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 Tubes 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 Tubes TP304/304L, TP316/TP316L TP310/310S TP347/TP347H
Copper Tubes UNS12200/UNS14200/UNS70600, CuNi70/30, CuNi 90/10
Titanium Tubes B338 Gr 2

Classification

Specific classification of finned tubes, there are lot of types of finned tubes, meanwhile also lot of new species comes up.

According to the classification process

  1. rolling forming finned tubes (extruded fin tube);
  2. welded finned tubes ( high frequency welded finned tubessubmerged arc welded finned tubes,
  3. roll forming finned tube
  4. set forming finned tube
  5. casting finned tube
  6. the tension wound finned tubes
  7. inserts the tube .

According to the fin shape classification

  1. square fin tube (Square finned tube);
  2. round finned tube
  3. spiral finned tube (spiral finned tube);
  4. the vertical fin tube (Longitudinal Finned Tube)
  5. corrugated fin tube
  6. serrated spiral finned tubes (Helical Serrated Finned Tubes);
  7. the needle finned tube
  8. the overall plate- fin tube ( plate-fin,
  9. the finned tube (inner finned tube).

And so on.

Depending on whether the finned tubes finned tube material and the same material can be divided into groups

  1. a single metal finned tube
  2. bi-metal composite finned tube

A single metal finned tube Material Classification

  1. copper finned tubes
  2. aluminum finned tube
  3. carbon steel finned tube
  4. stainless steel finned tube
  5. iron ( steel, finned tube etc. .

By use classification

  1. air conditioning with finned tubes
  2. air-cooled with finned tubes
  3. the boiler : finned water wall economizerair preheater tubes were used
  4. industrial waste heat recovery with finned tubes
  5. other special purpose finned tube etc.

The material certificate including all the tests can be provided, and also with EN10204 3.1standard.

Труба ребристая

Труба ребристая (конвектор отопительный)

Труба ребристая отопления (регистр отопления)

Отопительные трубы с ребрами обеспечивают хорошую теплопередачу, благодаря абсолютно жесткой посадке плоского ребра на внутренней трубе. Наши отопительные трубы с ребрами применяются везде, где особые условия монтажа требуют использования необычных решений, например, в фасадных системах отопления, на многоярусных складах, в теплицах, при защите стеклянных куполов от запотевания и т.д., также трубы используются для отопления жилых, промышленных и складских помещений. Имеют документированную высокую степень теплоотдачи.

Ребристые трубы монтируются при помощи стандартных фитингов, либо под сварку по желанию Заказчика.

Мы изготавливаем два типоразмера ребристой трубы :

Ду32 и Ду40.

Длину трубы определяет Заказчик.

Покрытие трубы:

-грунт

-порошковая окраска

-горячий цинк.

По ценам и срокам изготовления вы можете узнать, позвонив по телефону

Ребристая труба для отопления на свинокомплексах и птицефабриках

Ребристая труба для отопления на свинокомплексах и птицефабриках

Technology

It is fabricated with a batch of single fins that were processed by the punch press and then manually or mechanically, with a certain distance (wingspan) on the base tube.

This is the earliest fin tube fabrication with low cost and simple production process/ technology, easy to maintain. Divides into manual set and mechanical set. Manual set uses a tool that relies on the power of man to press the fins one by one. This method is limited by the pressure of the fin, so it is easy to get loose. The machine – set fin is carried on the wing piece machine. Due to the mechanical impact or liquid pressure, the pressure of the fin is high, so it can be used in a larger volume. The bonding strength between fin and tube is high and not easy to loosen. Mechanical transmission has high productivity, but the noise is large, the safety is poor, and the working conditions of the workers are not good. Although the hydraulic transmission does not have the above problem, but the equipment price is more expensive, the technical requirement to use maintenance personnel is higher, its productivity is also lower.

Currently HF Fin Tube is one of the most widely used helical fin tubes, you can see it as waste heat recovery in power, metallurgy, concrete, oil and gas, petrochemical, etc. When winding the steel strip around steel tube, the use of high frequency current skin effect and proximity effect on steel strip and steel pipe surface heating, until the plastic state or melt, the coil steel belt must be under pressure to complete welding. Comparing with embedded type and spot welding spiral crimped type, it is more advanced either on fin tube quality or production efficiency or automation degree.

The extruded fin is formed from an outer aluminum tube with a large wall thickness (muff), which is aligned over an inner base tube. The two tubes are pushed through three arbors with rotating discs that literally squeeze or extrude the aluminum fins up and out of the muff material in a spiral shape in one operation. Comparing with welding fin tube, dr extruded fin has higher production efficiency with low cost on material and high heat transfer. At present, it divides into copper or aluminum single metal fin tube and bi-metal composited fin tube.

Fin tube manufacturers produce a wide range of fin tubes. They are used in heat exchangers (air, water and chemically cooled) for various industries such as petroleum, petrochemical, steel, power generation and many more.

Corrosion protection processes are performed during fin tube manufacturing and the material used is corrosion resistant. Some fin tube types are:

Helical high fins

Helical high finned tubes are used to repair air-cooled heat exchangers and are available in 5 variations

Type Photo Descriptions Properties
"KL" fin tubes Fin tube After application the fin foot is knurled into the corresponding knurling on the base tube thereby enhancing the bond between the fin and tube resulting in improved heat transfer characteristics. Max. operating. temp. 260ºC Max working temperature – 260 °C (500 °F)
Atmospheric corrosion resistance – acceptable
Mechanical resistance – acceptable
Fin material – aluminum, copper
"G" fin tubes Fin tube Fin strip is wound & embedded on a groove and securely locked by closing the groove with the base tube metal. This ensures maximum heat transfer at high temperatures.
Max. operating temp. 450ºC
Max working temperature – 400 °C (752 °F)
Atmospheric corrosion resistance – poor
Mechanical resistance – acceptable
Fin material – aluminum, copper, carbon steel
"LL" fin tubes Fin tube Manufactured in the same way as the ‘L’ fin type except that the fin foot is overlapped to completely enclose the base tube thereby giving excellent corrosion resistance. This type of tube is often used as an alternative to the more expensive extruded type fin in corrosive environments. Max. operating. temp. 180ºC Max working temperature – 180 °C (356 °F)
Atmospheric corrosion resistance – acceptable
Mechanical resistance – poor
Fin material – aluminum, copper
“L” fin tubes Fin tube The strip material is subjected to controlled deformation under tension giving the optimum contact pressure of the foot of the fin onto the base tube thus maximizing the heat transfer properties. The foot of the fin considerably enhances the corrosion protection of the base tube. Max. operating. temp. 150ºC Max working temperature – 150 °C (302 °F)
Atmospheric corrosion resistance – acceptable
Mechanical resistance – poor
Fin material – aluminum, copper
Extruded fin tubes Fin tube This fin type is formed from a bi-metallic tube consisting of an aluminium outer tube and an inner tube of almost any material. The fin is formed by rolling material from the outside of the exterior tube to give an integral fin with excellent heat transfer properties and longevity. Extruded fin offers excellent corrosion protection of the base tube. Max. operating. temp. 280ºC. Max working temperature – 285 °C (545 °F)
Atmospheric corrosion resistance – excellent
Mechanical resistance – excellent
Fin material – aluminum

Uncovered tube area between the fins

Fin tube

Fin foot is pre-formed into an LL shape (overlapped LL) and applied to base tube under tension. However, foot is pre-shaped to give overlap of one foot onto another, thereby improving base tube protection and thermal contact area Fin materials: Aluminum Base tube materials: Any metallic material. The smooth flat fins perpendicular to the tube surface give rise to very low resistance to air /gas flow and ensure that fouling is kept to a minimum. The foot of the fin is in contact with base tube and provides a complete sheathing over the finned length.

The Overlapped “L” fin design has interlocking fins that are wound together to prevent movement and separation. The fin protects the entire tubes, so the designation works well for the applications where corrosion is a factor.This type of finned tube is often used as an alternative to the more expensive extruded type fin in corrosive environments.

What are fin tubes?

Fin tubes are a type of heat exchanger that is used in many different industries. These tubes have a finned surface, which increases their surface area and allows them to transfer heat more efficiently. This makes them ideal for applications where high heat transfer rates are required, such as in power plants and refrigeration systems.

Fin tubes are made from a variety of materials, including copper, aluminum, and stainless steel. They are available in a range of sizes and shapes and can be customized to meet the specific needs of each application.

One of the key benefits of fin tubes is their ability to operate efficiently at high temperatures and pressures. This makes them suitable for use in a wide range of applications, including air conditioning, heat exchangers, and radiators.

In addition to their high thermal performance, fin tubes are also durable and long-lasting. They are resistant to corrosion and can withstand the harsh environments often found in industrial settings. This makes them a cost-effective solution for many different industries.

Delivery

Inspection

The first actual inspection work on the fin tube heat exchanger is the raw materials inspection. Based on the ASME Code, providing material test reports for fin tube heat exchanger plates is mandatory. For other components, the marking inspection will be enough.

Inspection coil for fin tube
Inspection coil for fin tube
Inspection raw tube for fin tube
Inspection raw tube for fin tube
Inspection raw tube for fin tube
Inspection raw tube for fin tube
Inspection ring for fin tube
Inspection ring for fin tube
Inspection fin tube
Inspection fin tube
Inspection fin tube
Inspection fin tube

Packing

The Finned Tube is exposed to the outside to prevent rainwater from falling, try to keep it dry, and it should not be too close to the ground to prevent the irrigation in the greenhouse from corroding the finned tube. After the maintenance of the finned tube, the service life of the finned tube will be greatly increased.

Packing fin tube
Packing fin tube
Packing fin tube
ASME SA179 fin tubes

Wooden cases

ASME SA179 fin tubes

Well packing

Packing fin tube
FAQ FAQ

We are a pretty proactive bunch. So, while we do charge a small fee per design to cover our costs, we absorb these costs when it is for a regular customer or where we are working jointly on a project. We also refund the fees in case it is followed by an order.

Can you assist with the design for my application?

Absolutely, we can.

Applied Fin Tube

Applied Fin Tube is made with strip wrapped under tension around the base of the tube. Fins are welded to the base tube at the strip ends.

Why do Pin fin tubes weigh less than L type fin tubes?

Pin Fin tubes are made from wire. Being cylindrical, wire has a larger area per unit of weight than the strip used in L type fin tubes. Also, due to the looped nature of the wire, less material is put on the tube than in the case of L fins. Consequently, the surface area of fins per meter of tubes is also less. However due to the superior turbulence created by the looped wire the actual heat transfer per meter of tube is significantly higher than in the case of L Type Fin Tubes. All of this together contributes to the weight differential between wire wound fin tubes and L Type Fin Tubes. In the case of similar metals, it is weighing half and in the case of Aluminium L fin vs. Steel wire fin they weigh about the same. The higher performance S5 pin fin tubes have an airside heat transfer performance per meter of tube that is 250% of the L type fin tubes.

Can Sunny Steel supply my fin tubes?

Yes. A lot of our customer choose to supply their own pipes or tubes, however, a lot of customers ask us to supply them and we are happy to accommodate! We stock various sizes and if we don’t have what you need we can bring it in from one of our many suppliers. If you would like us to include the pipe or tube material in your order, please indicate that when you request a QUOTE.

High Frequency Resistance Welding

A continuous helical fin is attached to the base tube by high frequency electric resistance welding in order to give an efficient and thermally reliable bond. Fins can be either solid or serrated (segmented). The weld produced in this process is a true forge, blacksmith weld. This type of weld is comprised of a fusion between two portions of parent metal without the introduction of a filler material. The weld is simply produced by heating the interfaces to be joined to a plastic state and applying pressure.

Used in boilers, furnaces and fired heaters for efficient heat recovery.

Uses of finned tubes

The main uses for high frequency welded finned tubes are in the heat recovery associated with boilers for power generation and in furnace applications for the petrochemical industry.

Tube bending:

Our finning machines are equipped with online single or duplex cold bending equipment that can manipulate both ends of tubes in a single operation, thus ensuring exact alignment of the ends.

Do we stock fin tubes?

We do not. Our market lends itself to customer designed products, each special in itself. The number of combinations of diameter, overall length, materials and fin specs are too vast. Sunny Steel builds each finned product to each customers needs.

What are finned tubes used for?

Finned tubes are the main components of heat exchangers. They are a series of tubes where fins have been added on the outside to increase the contact area with the outside fluid, to exchange heat and between the fluid inside the tube and the fluid outside the tube. Finned tubes are elongated aluminium cladded carbon steel flat tubes with brazed aluminium fins.

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) tubes, 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 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 of the tube. In mathematical terms, the product of heat transfer coefficient for the outside fluid multiplied by the outside surface area is made to more closely match the product of the inside fluid heat transfer coefficient multiplied by the inside surface area.

For any kind of information and request do not hesitate to contact our team, Sunny Steel is at your complete disposal.

【H】 Ceramic lined pipe

Ceramic lined pipe is made through self-propagating high-temperature synthesis (SHS) technique.

【H】 Cast basalt lined steel pipe

Cast basalt lined steel pipe is composed by lined with cast basalt pipe, outside steel pipe and cement mortar filling between the two layers.

【H】 Ceramic Tile Lined Pipes

Ceramic tile lined pipes have very uniform coating of specially formulated ceramic material that is affixed to the inner of the pipe.

【H】 Rare earth alloy wear-resistant pipe

The material of the rare earth alloy wear-resistant pipe is ZG40CrMnMoNiSiRe, which is also the grade of rare earth alloy steel.

【H】 Tubes Erosion Shields

Tubes Erosion Shields are used to protect boiler tubing from the highly erosive effects of high temperatures and pressures thereby greatly extending tube life.

【H】 ASTM A213 T91 Alloy Tube

The ASTM A213 T91 seamless tubes are primarily used for boiler, superheater, and heat-exchanger.