Detailed Product Description

Product: longitudinally finned tube

Shanghai Xinjun has been making finned tubing for more than 40 years. Finned tubes are able to even out the heat transfer between the inside of the tube and the outside.  When the heat transfer coefficient on the outside of the tube is significantly lower than the heat transfer coefficient on the inside of the tube, there is a major advantage to incorporate fins on the outside tube surface to take full advantage of the high heat transfer rate on the inside of the tube.A good example is the frequently encountered situation of heating viscous oil outside a tube with steam condensing on the inside of the tubes.  The internal steam coefficient may be 1500 Btu/hr-ft2-F or more and the outside coefficient only 20 or 25.  By using a finned tube with eight times as much surface on the outside of the tube, the total length of the tube required for heating the viscous oil can be reduced by one-sixth.  Similar gains are obtained when heating gases with steam where the external coefficient of the gas to tube is only 10-20.

Our this kind of finned tubes feature high frequency resistance welded finned tube.  Welding is necessary to prevent deterioration in a finned tube's ability to transfer heat that results from a rising contact resistance between fin and pipe.  If fins are wrapped or embedded, thermal cycling will loosen the fin (increasing contact resistance) and cause a loss in the finned tube's heat transfer capability.