LWN FLANGES

The long high neck flange is actually an extended form of the neck butt welding flange. The flange neck is of micro straight cylinder type. The neck height is 229mm (< = DN 100) or 305 mm (> DN 100). The groove is not processed. The groove processing can be determined by consulting with the user according to the relevant requirements of hg20615-2009. Long and high neck flange is often used in class series pipe flange. When the pipe flange with nominal size less than or equal to DN50 is matched with the cylinder, using long high neck flange can also avoid welding difficulty caused by too thin wall thickness of flange neck end.            Features of long and high neck flange: the neck height is high, which improves the stiffness and bearing capacity of the flange            Compared with the butt welding flange, the long high neck flange has the advantages of heavy welding workload, high welding rod consumption, high temperature and high pressure, repeated bending and temperature fluctuation. However, the site installation is more convenient, and the process of welding seam rubbing can be omitted, which is more popular.