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1. U bend tubes and coils
A.
U-tube description and Parameter
Application:
It is applicable to the replacement of fluid, gas, petroleum transportation, pressure, heat transfer construction, decoration, etc. before boiler heating, and carefully designed according to
customer requirements.
Our U-bend is suitable for returning coolant/fluid flow at a speed of 180 degrees in a small space. Straight pipes are strictly in accordance with the requirements of standard specifications and
customer drawings.
Material:
Stainless steel, carbon steel, copper and copper alloy, Inconel, etc.
Size range:
OD 6-273mm, WT 5-35.0mm, Length=<25000mm
We are tube products manufacture. Contact Segment for any u bending tubes.
B.
Manufacturing process of U-shaped pipe
Process steps:
Raw material - grinding - end treatment - cold rolling - grinding end level - degreasing - solution annealing - straightening - cutting - pickling - surface passivation - quality inspection - NDT
- packaging - testing - U-shaped packaging and transportation.
Test items:
Appearance inspection.
Dimensional inspection.
Chemical composition test.
Mechanical property test.
U-bend+300 mm straight length PWHT (solution annealing) bent in 5-7 seconds at 680C.
100% hydrostatic test after bending.
According to customer's requirements.
C.
What is U-Tube heat exchanger?
U-shaped tube heat exchanger is a kind of shell and tube heat exchanger, which is composed of tube sheet, shell, tube bundle and other part.
Under the same diameter, the heat exchange area of U-tube heat exchanger is the largest.
The main structure of the U-tube heat exchanger includes the header, cylinder, head, heat exchange tube, nozzle, baffle, impact plate and draft tube, anti short circuit structure, support and
other accessories on the tube and shell side
D.
U-Tube heat exchanger Pros and Cons
Pros:
The U-tube heat exchanger has only one tubesheet. Both ends of the tube are fixed on the same tubesheet. The tube can expand and contract freely without thermal stress and has good thermal
compensation performance; Double tube pass is adopted for the tube pass, with long process, high flow rate, good heat transfer performance and strong pressure bearing capacity. The tube bundle
can be extracted from the shell, which is convenient for maintenance and cleaning, simple structure and low cost.
Cons:
Due to the limitation of the curvature radius of the elbow, the heat exchange tubes with limited tube arranged methods, the innermost tube spacing of the tube bundle is larger, the utilization
rate of the tube sheet is lower, and the shell side fluid is easy to form a short circuit, which is adverse to heat transfer. When the tube leaks and is damaged, only the U-shaped tube at the
outer of the tube bundle can be easily replaced. If the inner heat exchange tube is damaged, it cannot be replaced. It can only be blocked. Moreover, a damaged U-shaped tube is equivalent to two
damaged tubes, with a high scrap rate.
E.
Finned tube coils application and parameter
Applications:
HVAC / Air Handling Units
Heat Pumps
Boiler Economisers
Process Drying
Agricultural Drying
Space heating
De-humidification
Process cooling
Heat recovery
Air cooling in food manufacture
Air heating using steam / thermal oil
Materials:
Tubes in copper, steel or stainless steel
Fins in aluminium, copper, steel or stainless steel
Frames in galvanised steel, stainless steel, aluzinc or copper
Connections in brass, steel or stainless steel
We also supply various coatings to protect against corrosive environments
以下是COILS专用产品描述
F.
What is Stainless steel coil?
Finned tube coils are a type of heat exchanger that is commonly used for transferring heat between two fluids or gases. The coils consist of a series of tubes that are arranged in a circular or
rectangular pattern, and these tubes are typically made of copper, aluminum, or stainless steel.
The outer surface of these tubes is coated with thin metal fins that extend outward from the tube surface. These fins increase the surface area of the tube, which in turn increases the efficiency
of heat transfer between the fluids or gases flowing through the tubes.
Finned tube coils are used in a wide range of applications, including heating, ventilation, and air conditioning (HVAC) systems, refrigeration systems, and industrial processes that require
precise temperature control. They are also used in the production of steam and in power generation applications.
Overall, finned tube coils are a reliable and efficient means of transferring heat between two fluids or gases and are an important component of many industrial and commercial system.
G.
Stainless steel coils
Applications:
Metals used in chemical industry, machinery, electronics, electric power, medical equipment, aviation, aerospace, communications, petroleum and other industrial fields Stainless steel coil, in
English, is generally a coil or mosquito coil with a diameter of 0.5cm to 20mm and a thickness of 0.1cm to 2.0mm; It is widely used in chemical industry, machinery, electronics, power, textile,
rubber, food, medical equipment, aviation, aerospace, communications, petroleum and other industrial fields.
Stainless steel industrial tubes, ultra long coils, U-tubes, pressure tubes, heat exchange tubes, fluid tubes, spiral coils Product features: high-temperature steam resistance, impact corrosion
resistance, ammonia corrosion resistance; It is resistant to scaling, contamination and corrosion; Long service life, reduce maintenance time and save costs; Good pipe installation process,
direct pipe replacement, safe and reliable; The pipe wall is uniform, the wall thickness is only 50-70% of that of copper pipe, and the overall thermal conductivity is better than that of copper
pipe; It is an ideal heat exchange product for the transformation of old units and the manufacture of new equipment. It can be widely used in petrochemical, electric power, nuclear industry,
medicine, food and other industries.
2. Laser welded finned tubes
1) Aluminum gas boiler laser welded heat exchanger Laser Welded Finned Tubes heat
exchange for solar Water Heating
2) Stainless steel finned tubes laser welded cooling Delivery of laser-welded finned
tubes fin tube
3) Laser welding finned tube made of Stainless Steel 304 316
4) Laser Welding Finned Tube
5) Copper Laser Welded Finned Tubes
6) Laser Welding Fin Tube Making Machine Finned Tube Steam Heating Coil Aluminium Tube
Extended FinTube
7) Stainless Steel Finned Tubes Laser Welded Cooling Delivery Of Laser-welded Finned
Tubes Fin Tube
8) China factory sus304 stainless steel laser welding heat exchanger fin tube
factory
9) Astm a269 stainless welded fin tube for boiler and heat exchanger
A.
Laser welded finned tubes advantages
Prevent crevice corrosion, with long service life.
Easy to clean, suitable for food and pharmaceutical industries.
The ideal heat transfer area is small, reducing the investment cost.
Match with the process to reduce use and maintenance costs, reduce costs, and reduce investment costs.
The fin part can be bent for quick and convenient processing to reduce deformation.
The tubes are hardly affected by the welding process. The small diameter manufacturing becomes possible to reduce the weight and space of the heat exchanger and reduce the unsafe factors in the
manufacturing process.
B.
Laser welded finned tubes Application
Laser welded finned tubes compared with other types finned tubes, the development and research has greatly saved material costs and achieved high penetration rate, which can prevent gap
corrosion, prolong service life and reduce heat transfer resistance. Now it has been applied in various fields such as boilers, chemical industry, ships, waste heat power generation and home
decoration.
In the boiler industry, the surface has a larger heat exchange area, is environmentally friendly, energy-saving and efficient, and meets the emission requirements. The advantages of integral
finned tubes are given full play.
C.
Laser welded finned tubes characteristics
ü
The thickness of base tube can be 0.8-1.5 mm, and the thickness of fin can be 0.3-1 mm, which greatly saves the material cost compared with other processes.
ü
High penetration rate, which can prevent gap corrosion, prolong service life and reduce heat transfer resistance.
ü
100% welded, no filler material.
ü
Use gas protection, and the welding shall be free of defects such as air hole and sand hole.
ü
Breaking through the material limit, different materials can be used for processing.
ü
Easy for secondary processing, can directly coil and bend pipes.
Small welding heat affected zone and small metallographic change make it possible to process small diameter finned tubes.
D.
Laser welded finned tubes Parameter
l
Basic dimensions:
lBase
Tube Diameter: 10mm-50mm
lBase
tube wall thickness: 1mm-8mm
lFin
Thickness: 0.4mm-0.8mm
lFin
Pitch: 2mm-20mm
lFin
Height: 5mm-19mm
l
l
Fin material:
lCarbon
steel, Titanium tube, Stainless steel etc.
l
E.
The heat transfer principle of laser welding stainless steel finned tubes
E.What
is the heat transfer principle of finned tubes?
E.If
you want to know the heat transfer principle of finned tubes, need to know what the heat transfer coefficient is. The heat transfer coefficient is the heat transfer quantity per unit and heat
transfer area, which can reflect the heat transfer capacity between the fluid and the wall.
E.Finned
tubes are heat exchangers composed of round tubes or smooth tubes. How can we improve the heat transfer of round tubes? One of the effective methods is to use an extended surface on the outer
surface of the tube to make a finned tube. It is assumed that the actual heat transfer area of the finned tube is several times of the original surface area of the bare tube. Although the heat
transfer coefficient of the flue gas is still very low, the heat transfer effect reflected in the surface area of the bare tube will be greatly increased, so that the entire heat transfer process
will be enhanced. When the total heat transfer is appropriate, the metal consumption of the equipment will be reduced, and the economy will be improved.
E.Finned
Tubes Application Examples:
E.1.
Heat pipe air preheater series.
E.Application:
Absorb waste heat from flue gas and heat combustion supporting air to reduce fuel consumption and improve combustion conditions, so as to achieve the purpose of energy conservation; It can also
absorb waste heat from flue gas for heating other gas media such as gas.
E.2.
Heat pipe economizer series.
E.Application:
Heat is absorbed from flue gas to heat water supply. The heated water can be returned to the boiler (as an economizer) or used alone (as a water heater), so as to improve energy utilization and
achieve the purpose of energy conservation.
E.3.
Heat pipe waste heat boiler (evaporator) series.
E.Application:
Heat pipes are used as heat transfer elements to absorb the waste heat of flue gas with higher temperature to generate steam. The steam generated can be combined into the steam pipe network (to
achieve the pipe network pressure), and can also be used for power generation (large steam volume and stable heat source) or other purposes.
F.
Laser welded composite finned tube Application
F.Laser
welded composite finned tube is an efficient heat transfer element. Its heat transfer area is several to dozens of times than the bare tube, which can enhance heat transfer, reduce flow
resistance, and reduce metal consumption, thus improving the economy and operation reliability of the heat exchange equipment. At present, laser welded composite finned tubes have been widely
used in chemical industry, electric power, metallurgy, petrochemical, boiler, building materials, light textile, environmental protection, drying, medicine and other fields.
F.Advantages
of laser welding composite finned tubes:
1)
The installation is simple and economical. The length of laser welded composite fin tube can reach 12 meters, reducing the connection points, making the installation more economical and fast, and
reducing the probability of water leakage at the connection.
2)
The maintenance is simple. After installed of laser welded composite finned tube, the maintenance is basically unnecessary.
3)
High efficiency. The laser welded composite finned tube is the full contact welding between the fin and the steel pipe. The heat dissipation area is more than 8 times that of the smooth tube. The
interior is more smooth and the internal water flow resistance is small.
4)
It has a long service life, high mechanical strength between the fins and pipes, and the tensile strength can reach 600Mpa. The inside and outside of the pipes are all hot-dip galvanized.
Material fins: carbon steel, corrosion-resistant steel, stainless steel, alloy steel. Type of fins: solid teeth, open teeth.
4)
A.
Laser welded composite finned tube Application
A.The
greater temperature difference required for laser welded finned tubes to transfer heat, the greater its thermal resistance will become. Its thermal resistance is equal to the reciprocal of the
heat transfer coefficient, indicating the greater heat transfer coefficient, the smaller its thermal resistance will be. On the contrary, the smaller heat transfer coefficient, the greater its
thermal resistance will be.
A.The
heat transfer coefficient on the air side is less than that on the water side, so the thermal resistance on the air side is greater than the water side, which becomes the main thermal resistance
affecting heat transfer, making the air side bottleneck of the heat transfer process and limiting the improvement of heat transfer.
A.In
order to reduce the thermal resistance on the air side and overcome the bottleneck effect on the air side, laser welded finned tubes may take a variety of measures in the design of heat
exchangers. The choice is to add fins on the outer surface of the air side, that is to use finned tubes.
A.The
finned tube has greatly expanded the original heat transfer area at the air side. The manufacturer of stainless steel laser welded finned tube has made up for the low heat transfer coefficient at
the air side and greatly improved the heat transfer.
A.
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.
info@segmenthermal.com
+86 133 7218 1631, +86 134 5152 4805
Office Tel.: +86 512 6558 2989
