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.
Pipe flanges are manufactured in all the different materials like stainless steel, cast iron, aluminium, brass, bronze, plastic etc. Most commonly grade used are A105 ( CS ), A182 ( SS ), & A350 ( LT).
The material of a flange, is basically set during the choice of the pipe, in most cases, a flange is of the same material as the pipe.
Typical standards include ASME en ASTM, unless otherwise indicated. ASME B16.5 describes dimensions, dimensional tolerances etc. and ASTM the different material qualities.
Types Of Flanges
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
- API 6A Flange ( WN / BL )