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Flanges and types of flanges

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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.

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

Most used flange types in petro and chemical industry. All types except the lap joint flange are provided with a raised flange face.
Special flanges
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
  • Special flanges

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One comment

  1. Out of the most used flange types, which method is the most commonly used? I don’t know much about forming piping systems. It’s just kind of interesting to learn about.

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