4 Different Types of Flanges

What is Flange?


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

Where is A Flange Applied and Used?

As now, we all know that flange is used for connecting Piping Elements, let us now Understand where it is further Applied and Used.
  • Pipeline engineering
  • Oil & gas industry
  • Mechanical engineering
  • Plant engineering
  • Marine industry
  • Waste water management
  • Chemical industry
  • Petrochemical industry
  • Power industry
  • Aerospace
  • Food processing industry and many more.
Now that we know what is a flange and where a flange can be used, its time to understand its types. So, here we are listing 4 Different Types of Flange, which can be used by as per Required Circumstances.
  • Weld Neck Flanges
  • Socket Weld Flanges
  • Spectacle Blind Flanges
  • Screwed / Threaded Flanges

WELD NECK FLANGES:-

The Welding neck flanges is normally referred to as the high hub flange and comprises of  2 types, regular type flange which is used with pipes and the long type which is used in Big Plants.  Weld Neck Flanges is designed to transfer stresses to the pipe, thereby reducing high stress concentrations at the base of the flange. Weld Neck Flanges is widely used and can be Fixed with Bolts.



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Socket Weld Flanges:  

Socket-Weld Flanges has a socket in which the pipe is fitted. Welding for this flange is done from outside on the pipe. When using a socket weld flange, the inner diameter needs to be the same as the inner diameter of the pipe. The socket flange is only suitable for pipes with a nominal diameter of 150 or less.



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Screwed or Threaded Flanges: 

Threaded Flanges, also known as screwed flange, is having a thread inside the flange bore which fits on the pipe with matching male thread on the pipe. Threaded flanges are widely demanded as pipe flanges used in different industrial applications.
This type of joint connection is Speedy and simple but not suitable for high presser and temperature applications. Threaded Flanges are mostly used in utility services such as air and water.



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Spectacle Blind Flange: 

A Blind flange is round plate which has all of the relevant boltholes but no centre hole, and because of this feature this flange is used to close off the ends of a piping systems and pressure vessel openings. It also permits easy access to the interior of a line or vessel once it has been sealed and must be reopened.



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Description for Flanges


  • Material: Carbon steel: ASTM A 234 WPB, IS 1239 PART II, Stainless Steel: ASTM A 182F-304/304H/304L/316/316H/316/316Ti, 309, 310, 317L, 321, 347, 904L

  • Standard:ANSI,JIS,DIN,BS4504,SABS1123,EN1092-1, UNI,AS2129,GOST-12820

  • Size:15NB to 1200NB, ANSI B16.5

  • Class:150#, 300#, 600#, 900#, 1500#, 2500#

  • Packing:No Fumigate or Fumigate Plywood/Wood Pallet or Case

  • Surface Treatment:Anti-rust Oil, Transparent/Yellow/Black Anti-rust Paint, Zinc, Hot dipped Galvanized, Sand Blasting.

  • Usage:Pipeline Engineering, Offshore, Water System, Plant Engineering, Shipbuilding, Oil and Gas, Electric Power, Pipe Projects, Chemical Industry, Aerospace etc

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Quick Links

Slip On Flanges Specifications and Dimensions
Applications and Uses of Blind Flanges
Long Weld Neck Flanges Grades

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