High-alloy flanges and connect in the tube or cylinder, head end of round disc, several bolt holes evenly distributed on the disc, and are made of high-alloy, is the pipe or container for detachable connections are most commonly used important part.
Certain vessel flange nominal diameter applies a certain nominal diameter of the container, as is some nominal diameter of flange for a certain nominal diameters of pipes, pipe fittings. Containers of the same nominal diameter of flange and flange sizes are not the same. They cannot substitute each other. When the vessel was made by pipes, flanges.