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.