Flanges General

A flange is a method of connecting pipes, valves, pumps and other equipment to form a piping system. It also provides easy access for cleaning, inspection or modification. Flanges are usually welded or screwed. Flanged joints are made by bolting together two flanges with a gasket between them to provide a seal.


The most used flange types in Petro and chemical industry are:

Welding Neck Flange

Slip On Flange

Socket Weld Flange

Lap Joint Flange

Threaded Flange

Blind Flange

All types except the Lap Joint flange are provided with a raised flange face.



Except the most used standard flanges, there are still a number of special flanges such as:

Orifice Flanges

Long Welding Neck Flanges

Weldoflange / Nipoflange

Expander Flange

Reducing Flange