There are currently 36 sizes of such devices.

with a spike or groove;

with a beam for a lens lining;

with a back under the oval gasket.

The diameter of the flanges

There are currently 36 sizes of such devices. Diameters of pipeline flanges can vary from 10 to 3000 mm. Flanges are selected on this basis depending on the pressure indicators in the pipeline, the material of the manufacture of this device itself and some other factors.