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Stud finned tube
Stud finned tube

The studded fin tube is manufactured by resistance welding of studs on the bare tubes.Stud Finned Tube, also known as nail head Finned Tube (also known as needle-shaped tube, nail-shaped ribbed tube),···

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The studded fin tube is manufactured by resistance welding of studs on the bare tubes.

Stud Finned Tube, also known as nail head Finned Tube (also known as needle-shaped tube, nail-shaped ribbed tube), adopts a square or hexagonal arrangement and is equally divided into cylindrical needles welded on the surface of the heat exchange tube. The square or hexagonal reinforced heat exchange nail head tube is assembled and welded to form a high-efficiency and energy-saving needle tube heat exchange tube group.

Because the Stud Finned Tube pin rib is a cantilever structure with a compact structure, under the impact of the airflow, the pin rib vibrates, making it difficult for soot to accumulate; coupled with the strong turbulent scouring of the flue gas, the Stud Finned Tube heat exchange The element has high heat transfer efficiency and strong self-cleaning ability.

Delivery conditions

The tube ends are square cut, free of burrs, the inside is dry and blown clean, and the two ends of the extruded bimetallic finned tube are coated with varnish on the outside.

Acceptance Criteria

API Standard 661 (Air-Cooled Heat Exchangers for General Refinery Service) or Delivery Conditions (TDC).

Features of Stud Finned Tubes

The structure of Stud Finned Tubes is compact. Under the impact of the airflow, the needle ribs vibrate, making it difficult for soot to accumulate; coupled with the strong turbulent scouring of the flue gas, the Stud Finned Tube heat exchange element has high heat transfer efficiency and has Strong self-cleaning ability.

Due to the high rigidity of Stud Finned Tubes, studded tubes can be used even under extreme temperature and pressure conditions.

It widely application to Economizer,Boilers, Heat ex-changers,tube bundles,Radiators, air coolers, air preheater etc.

The fins are manufactured by welding of the Fin Material which is essential a stud or rod welded at base to the tube by Electrical Resistance Process.

The current is made to flow through the Tube and the base of the studs. The studs are specifically made in shapes to facilitate the welding process. The Stud; during the finning “welding” process is also mechanically pressed on the tube at the point of welding thence causing a very good mechanical bond. This type of Fin Tube find very good application in high pressure and high temperature applications. The mechanical bond is very strong and hence finds application in places where extreme mechanical load, stress is expected while during the process or cleaning etc.

These Fin Tubes find application in Finned Pipes, Air Coolers, and Heat Exchangers etc and are preferred in Industries like Petrochemical Refineries, Power Plants, Chemical Industries, and Steel Plants etc.

Base Tube Material:

  • stainless steel stud tube, carbon steel stud pipe,alloy steel studded tube.

Material Grade:

  • A335 P1,P5,P9,P11, A213 T9,T11,T22,TP304,TP316/316L,TP321

  • A106GrB,A210 Gr A1, A210 GrC,ASME SA192/ASTM A192

  • ASME SA213/ASTM A213 TP304/304L TP316/TP316L TP321

  • TP310S TP317,

Studs Material:

  • Carbon steel ASTM A510 grade 1005 to 1010. Stainless steel AISI 304, 316, 410, 347, 321.ASTM A193 Grade: B6, B6X, B8, B8a, B8M, B8C. Cr-Mo alloy etc.

  • Base pipe O.D:31.75-165mm Stud height:10-60mm

  • Stud pitch: as customer's request.

  • End:Plain Ends, Beveled Ends

  • Bare tube length on both side:As Customer's request.

Application

The nail head tube group is especially suitable for compact waste heat boilers, oil-fired, gas-fired boilers and oil heaters. Under the same heat exchange, its weight and external dimensions are greatly reduced. The anti-fouling performance of the nail head tube group is greatly improved compared with other conventional enhanced heat transfer boiler tubes. In the case of low flue gas temperature, the nail head tube can still recover waste heat economically, and has broad application prospects in heat exchange and energy saving projects.

Studded Tubes

Another one of our flagship products is the studded tube

Description

Product Name: Steel Fin Tube, Welded Fin Tube, Spiral Fin Tube, Longitudinal Fin Tube, Stud Fin Tube,H/HH type Fin Tube

• Base Pipe OD: 15.88-273mm

• Fin Height: 4.0-50mm

• Fin Thickness: 0.3 -2.0mm

• Number of Fins: 3~14 FPI

• Fin Pitch: 3mm-14mm

• End: Plain Ends, Beveled Ends

 

Base Tube Material

• Carbon Steel：ASTM A106 Gr B,ASME SA179/ASTM A179,ASME SA192/ASTM A192
• Stainless Steel：ASME SA213/ASTM A213 ；TP304/304L  TP316/TP316L TP321 TP310S  TP317
• Alloy Steel：ASME SA210/ASTM A210

 

Fin Material

• Carbon Steel：ASTM A53  GB/T5213-2019 08AL  SPCC
• Stainless Steel: TP304/304L  TP316/TP316L TP409

If you have any Inquiry, please don't hesitate to contact us immediately,

Email:info@fintuberadiator.com

 

 

 

Type Description Base tube Base tube Fin specification 
O.D. (mm) O.D. (inch) Fin pitch(mm) Fin pitch(FPI) Fin height(mm) Fin height(inch) Fin thick(mm) Fin thick(inch)
Embedded G Type Embedded/ Grooved Fin Tube 14-51 0.5-2 2--6 3--14 FPI 7--17 0.27--0.669 0.35--2 0.0137-0.0787
L Type Embedded/Wrap Around Fin Tube 10-51 0.4-2 2--6 3--14 FPI 7--17 0.27--0.669 0.35--2 0.0137-0.0787
LL Type Embedded/Wrap Around Fin Tube 10-51 0.4-2 2--6 3--14 FPI 7--17 0.27--0.669 0.35--2 0.0137-0.0787
KL Type Embedded/Wrap Around Fin Tube 10-51 0.4-2 2--6 3--14 FPI 7--17 0.27--0.669 0.35--2 0.0137-0.0787
Extruded Carbon base tube 15.88--50.8 0.625--2 1.8-8 3--14 FPI 5--16 0.2--0.63 0.3-1.2 0.012--0.047
Stainless base tube 15.88--50.8 0.625--2 1.8-8 3--14 FPI 5--16 0.2--0.63 0.3-1.2 0.012--0.047
Copper base tube 15.88--50.8 0.625--2 1.8-8 3--14 FPI 5--16 0.2--0.63 0.3-1.2 0.012--0.047
Low Fin Tubes ( Integral Fin Tube ) Carbon Steel, stainless steel, titanium, copper, brass, nickel alloy. 6.35--38 0.25--1.5 2.8--12.7 2--9FPI 0.38--1.27 0.015 --0.050
High Frequency Welding Fin tube Solid Helical Fin Tubes 15.88--273.1 0.625--10 3--25 0.118--1 5--30 0.196--11.811 1--3 0.0393--0.1181
Serrated Helical Fin Tube 15.88--273.1 0.625--10 3--25 0.118--1 5--30 0.196--11.811 1--3 0.0393--0.1181
H/HH Type Rectangular Fin tube 15.88--273.1 0.625--10 3--25 0.118--1 <219 <8 1--3 0.0393--0.1181
Studded Fin Tube 15.88--273.1 0.625--10 3--25 0.118--1 5--30 0.196--11.811 φ5-20
Elliptical/Oval Fin tube Hot dipped galvanized 36*14 2.5--3 0.0984--0.118 55*26 0.25 0.0098
Laser Fin tube Copper,Brass,nickel 10--45 0.393--1.771 2--10 0.0787-0.3937 5--23 0.196--0.905 0.3-1.2 0.011--0.047
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Stud tubes

Studded tubes are mainly used in furnaces and boilers where the surface is exposed to a very corrosive environment and dirty gases. Hence, frequent and aggressive cleaning is needed.

The steel studs are automatically resistance welded to the tube, producing high quality forge welds. Our automatic studding machines are capable of handling tube diameters from 60mm o/d to 219mm o/d and standard stud diameter of 12.7mm.

The welding process enables the combination of any grades for studs and tube: carbon, alloy, stainless steels and high nickel alloys. Alloy steel pipes are stress-relieved after studding, according to the relevant specifications for the class and grade of steel used.

Uses of Studded Tubes

Steel studded tubes are used instead of finned tubes for heat transfer in the petrochemical industry, generally in furnaces and boilers where the surface is exposed to a very corrosive environment and where very dirty gas streams require frequent or aggressive cleaning.

Manufacturing Range (Studded Fin Tube ):

Sr. No Particulars Range
1 Base Tube Material Stainless Steel, Carbon Steel, Alloy Steel, Titanium , Copper, Duplex Stainless Steel, & Inconel etc. (all material in the theoretical limit)
2 Base Tube Outside Diameter 60 mm to 200 mm
3 Base Tube Thickness 3 mm to 12.70mm Above
4 Base Tube Length 2000 mm Min To 15000 mm
5 Stud Material Carbon Steel/Stainless Steel/Alloy Steel
6 Stud Thickness 6mm to 16mm
7 Stud Density 15.88mm or 63 Studs Per Plate Per Meter (Can Be Customized to Clients Requirements)
8 Stud Height 12.7mm to 63.5mm
9 Bare Ends As per Client Requirement

Stud Finned Tubes is combined with two different materials

Core tube material: carbon steel, low alloy steel, stainless steel, brass, copper, copper-nickel alloy, aluminum bronze, nickel alloy.

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



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