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1. L.LL.KL.G types finned tubes
A.
SEGMENT provides four types wound Finned tubes as below:
Ø L type Finned Tubes:
ØThe aluminum strip (or copper strip) is first folded into an L shape, and then continuously helically wound on the outer surface of
the base tube under tension. The tension of the aluminum strip shall be properly controlled to maximize the contact pressure between the bottom of the fin and the base tube, so as to maximize the
heat transfer performance. The maximum working temperature is 150 ℃.
Ø LL type Finned Tubes:
ØIt is basically the same as the L-type, but the roots of each fin are overlapped with each other, and the surface of the base tube is
completely covered by fins, thus obtaining better corrosion resistance, with the highest. The working temperature is 170 ℃.
Ø KL type Finned Tubes (Knurled finned
tubes):
ØIt is basically the same as the L-type. The difference with L-type finned tubes is the root of the fin will be knurled to strengthen
the combination on the steel pipe. Such the Fins have a better combination ratio and heat transfer characteristics than L and LL type fins. The maximum working temperature is 250
℃
Ø G type Finned Tubes (Embedded finned
tubes):
ØThe winding edge of the fin is embedded into the groove on the surface of the base tube, and the gap between the groove and the fin
is filled back with the material produced when the base tube is grooved, so that the fin is firmed and the maximum heat transfer efficiency is guaranteed. The maximum working temperature is
350 ℃.
Ø
B.
L/LL/KL/G types finned tubes Parameter
² Basic dimensions:
²Base Tube Diameter: 19mm-51mm
² Base tube wall thickness:
²1.65mm-3.0mm for L/LL/KL types.
²2.11mm-3.5mm for G type.
²Fin Thickness: 0.3mm-0.8mm
²Fin Pitch: 2mm-15mm
²Fin Height: 10mm-16mm
² Fin material:
²Aluminum, Copper
² Base tube material:
²Stainless steel, Carbon steel, Titanium, Copper etc.
²
C.
Different types finned tubes compare
C.From heat transfer performance
view, the bimetal rolling type is the best.
C.From temperature resistance view,
the tension of wound fin decreases rapidly with the increase of temperature, so the contact thermal resistance increases rapidly; However, bimetallic strip rolling can keep stable in a wide
temperature range.
C.From corrosion resistance view,
the bimetal rolled plate type is the best, the L type, LL type and KL type are in the middle, and the G finned types is the worst.
C.From pressure resistance view,
there are rolling grooves on the inlaid base pipe, which has the lowest pressure resistance and is not suitable for high-pressure occasions.
C.From material consumption view,
the L/LL/KL types and G type are lower, while the bimetallic rolled type is higher. The aluminum consumption of bimetallic rolled type is 1/3 to 1/2 more than the coiled types.
C.From manufacturing process cost
view, the L/LL/KL winding type is the lowest, the G type is middle and the bimetal rolling type is the highest.
C.From environmental protection
view, although the bimetallic rolling plate type has good comprehensive performance, it needs to be washed during its manufacturing process. The acid and alkali used for washing are not only
harmful to human health, but also cause serious pollution to the environment.
D.
What is G type Finned Tubes (Embedded finned tubes)?
Embedded spiral finned tube is a spiral groove with a certain width and depth pre-machined on the steel
pipe, and then the steel strip is embedded on the steel pipe on the lathe. During the winding process, due to a certain preload, the steel strip will be tightly clamped in the spiral groove, thus
ensuring a certain contact area between the steel strip and the steel pipe.
At present, many countries in the world have carried out a lot of work in the fields of scientific research
and development of inlaid finned tubes, scientific research on the principle of heat conduction, strengthening of heat conduction, innovation of special equipment, improvement of design scheme
calculation method, and promotion of production and processing technology. Mosaic finned tube is mainly due to the different application places and different use regulations of heat exchanger, so
the structure types are also diverse. The shell-and-tube heat exchanger still has the primary impact on its scale and application place. There are also different ways to enhance heat
conduction.
Embedded finned tube is a kind of finned heat exchange tube with various structures, including annular
finned tube, spiral finned tube, vertical finned tube, etc. According to the manufacturing method, it can be divided into coiled fin tube, welded fin tube, cold rolled fin tube and embedded fin
tube.
When the wall temperature of the finned tube increases, the contact pressure between the fin and the tube
will change, and the contact thermal resistance will also change. The variation value depends on the type of finned tube and the initial contact pressure. With the increase of temperature, the
tension of the winding fin decreases rapidly, so the contact thermal resistance increases rapidly. Bimetal rolling can maintain stability in a large temperature range.
The base tube of finned tube is maintained by fins to resist atmospheric corrosion. Due to different
maintenance areas, various types of finned tubes have different atmospheric corrosion resistance. Bi-metal rolling is a method for repairing various finned tubes. In all finned tubes with hot-dip
galvanized surfaces, the ability to resist atmospheric corrosion is strong. For chemical plants or coastal areas with some corrosive gases in the atmosphere, attention should be paid to the type
selection data and types of finned tubes. Aluminum fins are easy to corrode.
The heat transfer performance of finned tubes is related to the contact resistance between fins and tubes,
and the contact resistance depends on the contact pressure between fins and tubes. Obviously, the heat transfer performance of welded plate and sleeve plate is better, followed by bimetallic
rolled plate, embedded plate and winding plate. After the second rolling, the contact area of KLM finned tube increases by about 50%, which is not affected by the pipe outer diameter tolerance.
After repeated cold and hot cycles, it can still adhere to the outstanding touch, so the touch thermal resistance is small and the heat transfer function is high. After adding airflow
disturbance, the total heat transfer coefficient of slotted finned tube can be increased by about 20%.
Many working pressures of embedded finned tubes depend on the data and wall thickness of the base tube, but
also on the type of finned tubes. Rolling (base tube is aluminum copper) has low pressure resistance and is not suitable for air cooler. There is a rolling groove on the embedded pipe, and the
working pressure decreases with the increase of the working temperature.
E.
How to maintain finned tubes
l Generally, when water is used for circulation
at the beginning of the operation, there may be slight leakage. When the temperature rises to the sterilization temperature, the leakage will disappear by itself. If the leakage does not stop,
the finned tube must be compressed a little more. If it is still ineffective, it is necessary to open and check the rubber gasket. It is also possible that the finned tubes are arranged in the
order of numbers on the fins, which should be corrected.
l Regularly check whether the finned tubes are
complete, whether there are deposits, coking, rust layer, and other scaling adhesion, and clean them immediately. At the same time, it is also necessary to check whether the adhesion between each
fin tube and the rubber washer is tight and whether the rubber washer itself is in good condition, so as to avoid leakage caused by rubber washer degumming and damage.
l When the rubber gasket needs to be replaced or
the degummed part needs to be repaired, the finned tube shall be removed and placed on the table, and the old gasket shall be removed, or the glue traces in the groove of the finned tube shall be
wiped out with fine sandpaper at the degumming position, and then the oil traces in the groove shall be wiped out with carbon tetrachloride or trichloroethylene, and then the back of the new
rubber gasket shall be wiped out with fine sandpaper, similarly with carbon tetrachloride or trichloroethylene, the alkene solvent wiped out the oil. Then, apply a thin layer of glue on the back
of the groove and rubber washer. Let it dry a little, but it still sticks. That is to say, the rubber washer is embedded in the groove, flattened around, and coated with a layer of talcum powder.
Then install the fin tube and clamp it gently. According to the glue instructions, it can be used after a period of time.
l When replacing the rubber gasket of the finned
tube, it is necessary to update all the segments so as to avoid uneven clearance between the fins and affect the heat transfer effect.
FAQ?
1. How to ensure a product
quality?
We adhere to the internal quality system (or QMS) based on industry standards such as ASME, National Boiler
and Pressure Vessel Commission, and customer requirements. Our quality system is recorded, documented, audited and implemented by our quality control department.
2. What standard products do
you stock?
We only stock Supplier Maintained inventory for contractual customers. We are flexible
to set up inventory systems with our customers when beneficial. Unless otherwise agreed upon with the customer all products are made-to-order.
3. What if I can't find finned
tube product that I am looking for on your website?
We want to be your complete source for finned tube products. We work to provide
solutions that help our customers succeed. Segment Industrial Tube is also able to help develop finned tube products in cooperation with your designs. And in the rare case that we are not the
best source, we will help point you in the right direction.
4. What is the maximum
diameter of Segment Industrial tube that can place fins?
Each style of tube or fin enhancement will dictate the range of tube size. Please
contact us to confirm the detailed spec.
5. Each type of tube or fin
reinforcement will determine the range of tube size. However, the maximum tube size of edge tension finned tube is 4 ″.
The answer is Yes. However, most of the time additional information such as a
dimensional sketch or finned tube characteristic would be
required. It should also be noted that when a quote like this is given we reserve the right to adjust pricing if unkown information is revealed later.
6. What type finned tube is best for my application?
We have over 15 years of finned tube manufacturing experience. However, Segment Tube
does not currently offer certified engineering services. Our team is happy to make suggestions, but the responsibility of design lies with the customer. We commit to giving you any practical
knowledge, experiential observations, or recommended outside engineering standards and services that would be beneficial to the situation.
7. How can I contact Segment
Industrial Tube after the normal business hours from 8:00 a.m. to 4:30 p.m.?
You are always able to connect with our team with below information.
+86 133 7218 1631, +86 134 5152 4805
Office Tel.: +86 512 6558 2989
WHAT IS A FIN TUBE?
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 SEGMENT 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.
Segment Industrial Tube is solely focused on producing the largest variety and most complete
solutions for finned tubing. These tubes are made in two typical styles. Applied finned tube which helically winds metal fins onto a tube or pipe. The second type, extruded finned tubes, are made
by forming fins into a base tube creating integral fins on the outside and/or inside diameter.
Our large variety of finned tube options gives the customer solutions to improve efficiency
and SEGMENT in most any heat exchanger. Review our finned tube product offerings to discover the best solution for you.
