Longitudinal I/L or U-finned tubes are produced from resistance welded fins along the length of the tube. The fins first form a U-shaped channel so that each leg of the U forms a fin. Channels are cut to the appropriate length, then oriented and resistance welded in place along the length of the tube. The channels are welded in pairs, diametrically opposed, so the number of fins specified must be a multiple of 4. For a given tube or tube size, the desired heat transfer surface area per unit length of tube can be obtained by specifying the appropriate fin height and number of fins. The number of large fins depends on the outer diameter of the tube – larger OD tubes can accommodate more fins. Longitudinal Finned Tube For Heat Exchangers Quick Details: Core tube material: carbon steel, low alloy steel, stainless steel, brass, copper, copper-nickel alloy, aluminum bronze, nickel alloy. 1. Carbon steel: A179, A192, SA210 Gr A1/C, A106 Gr B 2. Stainless steel: TP304/304L, TP316/TP316L 3. Copper: UNS12200/UNS14200/UNS70600, CuNi70/30, CuNi 90/10 4. Titanium: B338 Gr 2 Fin material: aluminum, copper, steel 1. Aluminum (Alu.1100, Alu.1060) 2. Copper. 3. Steel Fin type: U-fin, perforated, twisted… Tube Outer Diameter: Min. 19mm. Tube length: up to 18 meters. Number of fins: 2/4/8/16/18/32/36 pieces per row Number of fins: 16/20/24/32/40 Surface Protection: Both bare ends shall be zinc or aluminum metallized by electrospray arc system coating. Accessories: Tube support boxes, clamps or spacer boxes (materials: aluminium, zinc and stainless steel). Additional Info Payment Terms:T/T, LC Delivery: 15-30 days after payment Marking: Standard + Steel Grade + Size + Heat No + Lot No Package: Iron frame packing boxes and the desiccants are put into each package for continental transportation as well. or as required