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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 rotated. 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, 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.
Description of lapped joint flange:
1. Lapped Joint Flange Size: 1/2"-60"(DN10-DN1500)
2. Lapped Joint Flange Pressure Rating: Class 150-600, PN10-25.
ASME/ANSI B16.5 Lapped Joint Flange:
EN1092-1 Lapped Joint Flange:
DIN Lapped Joint Flange:
The FAQ: How are loose flanges and stub end used together, and what are the benefits of installation and use?
The answer please check here: loose flanges and stub end installation
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