LAPPED JOINT FLANGE is also called Loose flange or LJ flange,it is used with a stub end, which is welded to the pipe.The advantage of this flange connection is that the flange can be free to rotate around the stub. It is easy to align the bolt holes and easy to install on large diameter pipes.Loose flanges are also suitable for areas where the pipe needs to be removed frequently for cleaning or inspection, or where only the flange and not the pipe need to be rotated when aligning the flange bolt hole.When using the loose flange, the material of the flange stub shall be the same as that of the pipe;And flange material can be different from pipe material,like carbon steel or stainless steel, so it is more suitable for conveying corrosive medium of pipe and non-ferrous metal pipe system, in order to achieve as much as possible to save expensive materials (such as stainless steel and non-ferrous metal).

According to the different stubs, the flange can be subdivided into 4 types: butt welding ring with neck loose flange, butt welding ring plate type loose flange, flat welding ring plate type loose flange and flanged ring plate type loose flange.

With the ability to rotate freely around the stub and the use of durable carbon steel or stainless steel materials, these flanges provide a reliable and efficient connection that can save both time and money during installation.