Arafin Longitudinal Finned Tubes are produced by resistance welding fins in the longitudinal direction along the length of the tube. The fin strip is first formed into a U-shaped channel, such that each leg of the U will form a fin. The channels are cut to the appropriate length and then oriented along the length of the tube and resistance welded in place. The maximum number of fins is dependent upon the tube outside diameter -- larger OD tube can accommodate a greater number of fins. The choice of longitudinal finned tubes versus helical finned tubes seems to be governed mainly by geometric considerations. For example, some heater configurations consist of finned tubes inserted inside other tubes -- longitudinal finned tubes are the obvious choice for such applications. In other cases, users prefer longitudinal finned tubes for installations where the tube will be oriented in a vertical direction -- the fin orientation facilitates fluid drainage on the fin side of the tube. Like welded helical finned tubes, this welded steel configuration can be used for practically any heat transfer application, and is particularly suited to high temperature, high pressure applications. The important features of this configuration are efficient, effective bond of fin to tube under all conditions of temperature and pressure, and ability to withstand high fin-side temperatures.

   Specifications
    Tube size:        3/4 to 4 inch
    Fin thikness:     0.035 to 0.05 inch
    Fin heights:      3/8 to 1 1/2 inch
    Fin pitch:         Depennd on O.D
    Fin Material:    Any material that can be resitance or arc welded