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A. HF
WELDED HELICAL FINNED TUBES
SEGMENT Industrial is proud to supply a wide range of high frequency helical high finned tubes - great for
the petrochemical and power generation industry.
A continuous helical fin is attached to the base of the tube by high frequency electric resistance welding.
The helical fins produce a homogeneous, clean, continuous bond for efficient heat flow and resistance to corrosion.
B. High
frequency welded finned tubes features
High frequency welded finned tube is a kind of efficient heat dissipation element. It improves the
shortcomings of other finned tube radiators. The finned tube itself is a strip steel with a thickness of 0.8-1mm wrapped around the finned tube. At the same time, high frequency welding process
is used to weld the fins firmly on the tube, ensuring the bonding strength between the tube and fins. Its metal thermal strength has reached 1.10~1.20w/kg ℃, The finned tube is widely used in the manufacture of economizer of boiler, air preheater and energy-saving radiator of workshop and
residence, and is the first choice for later winding of heat pipe.
The spiral finned tube is a high efficient heat transfer element. Its heat transfer area is several 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, spiral finned tubes have been widely used in various boilers.
C. High
frequency welded Principle
Finned tube is a steel strip wound on the outer circle of the seamless steel tube with a certain thread
pitch (the steel strip is perpendicular to the surface of the outer circle of the steel tube). High frequency current is used as the welding heat source. The skin effect and electric heating
effect of high frequency current are used to locally heat the contact surface between the steel tube and the steel strip and the area to be welded, so that the contact surface can reach a plastic
weldable state. At the same time, an upset forging force is applied on the outside of the fin to make the metal oxide Extrusion of local melt and excess plastic metal makes the combination of
solid atoms between steel pipe and fin material, thus realizing plastic welding of contact surface.
D. High
frequency welded finned tubes Manufacturing process
The welding of high-frequency welding spiral finned tubes can be generally divided into the following
processes:
(1) Procurement and re-inspection of steel pipes.
Steel pipes shall be purchased according to the standards and technical terms required by the drawings;
After arriving to the factory, re-inspection shall be carried out carefully. The re-inspection contents shall include: quantity, specification, various inspection reports, appearance, dimension,
spot check on chemical composition etc.
(2) Preparation before welding.
The steel pipe surface must be in a state conducive to winding. The pipe surface should be free of pits,
dents, overlaps and grooves. Before welding, the oxides, grease, impurities and coatings affecting the welding quality on the external surface of the base pipe must be removed, usually by
polishing or sandblasting. Fin shall be made of thin steel plate, and the whole roll of thin steel plate shall be cut to the required width according to the required fin height.
(3) Fin winding and welding.
The steel pipe is installed on the fin winding machine, and the fins are according to the qualified winding
and welding process. The fin tubes are welding while winding on the fixed guide rail until the length is reached.
(4) Inspection and test.
The appearance inspection, scraping and peeling inspection are carried out for the wrapped fin tubes one by
one, and the inspection results should conform to the drawings and technical requirements. Then carry out the hydrostatic test one by one. The test pressure shall be 1.5 times of required spec.,
and the pressure holding time shall not be less than 5mins.
(5) Fin protection.
The finned tube shall be purged with compressed air after manufacturing. Good finned tubes outer surface
will be sprayed with anti-corrosion oil. The two ends of the finned tube are protected with caps to prevent water and debris entering the tube.
E. HFW Finned tubes process control
The welding rate and quality will directly affect the strength and heat transfer performance of fins. If the
welding rate is low, the weld strength will decrease, the thermal resistance of the finned tube will increase too. Then the heat transfer coefficient will decrease.
The welding strength is an indicator to measure the welding quality of fins. If the weld strength is low,
the fins will fall off when working due to the thermal stress, fluctuation and bending stress. After the fins fall off, they will gather together to affect the heat transfer, causing the fin tube
to be burned.
F. HF
WELDED TUBE SIZES AND MATERIALS
Usually a combination of carbon steel, low alloy steel, and stainless steel, we supply the helical finned
tube, which can either be serrated (segregated) or solid.
Tube thickness depends on the fin thickness and tube OD. The minimum thickness for tubes with a solid
fin is 2.13mm and 1.99mm for tubes with a serrated fin.
Fin height is dependent on the type of fin, tube OD, fin thickness and material. If it’s a solid fin
it’s usually between 6.3mm and 31.8mm, whilst serrated fins are 12.7mm-38.1mm.
Fin thickness varies depending on the fin type, as well as the height of the fin and tube OD. The
helical finned tube is usually between 1 fin/inch and 7 fins/inch.
G. We
supply the helical finned tube in a wide range of sizes, including:
Tube OD: 25.4 / 31.8 / 38.1 / 50.8 / 63.5 and 76.0 mm
Pipe OD: 26.7 / 33.4 / 42.2 / 48.3 / 60.3 / 73.0 / 88.9 / 101.6 / 114.3 / 141.3 / 168.3 and 219.1 mm
l SERRATED FIN
Fin Height: 0.5–1.5” (12.7–38.1mm)
(higher on application)
Fin Thickness: 0.036–0.05” (0.9–1.27mm)
Fin Spacing: 1–7 per inch (39–276 per metre)
Tube Outside Diameter: 0.75–8” (19.05–219.1mm) Segment Width: 5/32, 5/16” (4.5, 8.0mm)
l PLAIN FIN (SOLID FIN)
Fin Height: 0.25–1.0” (6.4–25.4mm)
(higher on application)
Fin Thickness: 0.036–0.098” (0.9–2.5mm)
Fin Spacing: 1–7 per inch (39–276 per metre)
Tube Outside Diameter: 0.75–8” (19.05–219.1mm)
H. TYPICAL
APPLICATIONS
The wide range of uses for helical high-finned tubes includes:
Steam condensers
Oil coolers
Air pre-heaters
Product coolers – gas, chemicals, petrochemicals, oil etc
Overhead condensers
Water coolers
Boilers
Coolers
Economizers
Fired heaters
Furnaces
Heat exchangers
I. GET A QUOTE FOR HF WELDED FINNED TUBES
To receive a quote for welded finned tubes, please get in touch at info@segmenthermal.com with following details:
number of pieces
pipe/tube: diameter, thickness, length and material
fins: material, type, height, thickness, spacing, length and unfinned sections
weld prep details (if applicable)
delivery period
J. ORDER HF WELDED FINNED TUBES
Our team is on hand 24/7 - ready to complete your order over the phone or via email.
If you need a helical finned tube in a hurry, rest assured we are capable of supplying HF welded helical
finned tubes for large scale projects within tight timescales.
Call us on +86 133 7218 1631, +86 134 5152 4805, Office Tel.: +86 512 6558 2989,
info@segmenthermal.com
K. FAST,
EFFICIENT DELIVERY OF HF WELDED FINNED TUBES
Here at SEGMENT Industrial, we aim to meet the requirements of every customer, ensuring fast and
efficient delivery of our helical finned tube as standard.
As with all our products, the welded finned tubes are packaged and dispatched securely. They are transported
via land, air or sea, worldwide and we schedule delivery for a time that suits you. We even offer emergency delivery as an additional service, helping to prevent unscheduled plant shutdowns.
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.