Weld neck flange

A weld neck flange (also known as a high-hub flange[1] and tapered hub flange[2]) is a type of flange. There are two designs. The regular type is used with pipes. The long type is unsuitable for pipes and is used in process plant.[3] A weld neck flange consists of a circular fitting with a protruding rim around the circumference. Generally machined from a forging, these flanges are typically butt welded to a pipe. The rim has a series of drilled holes that permit the flange to be affixed to another flange with bolts.[4]

Such flanges are suitable for use in hostile environments that have extremes of temperature, pressure or other sources of stress.[4] The resilience of this type of flange is achieved by sharing the environmental stress with the pipe with which it is welded.[1] This type of flange has been used successfully at pressures up to 5,000 psi.[2]


  1. 1 2 Roy A. Parisher, Robert A. Rhea (4 October 2011). Pipe Drafting and Design. Gulf Publishing Company. pp. 59–60. Retrieved 15 October 2014.
  2. 1 2 Thulukkanam, Kuppan (20 May 2013). Heat Exchanger Design Handbook (2nd ed.). CRC Press. p. 620. ISBN 9781439842126. Retrieved 15 October 2014.
  3. "Piping Designer - Resources for piping, engineering and design". piping-designer.com/. Retrieved 15 October 2014.
  4. 1 2 Smith, Peter (20 January 2005). Piping Materials Guide. Gulf Publishing Company. pp. 195–196. Retrieved 15 October 2014.

5. Flange design principles http://oakridgebellows.com/wp-content/uploads/2014/10/flanges-on-expansion-joints-1.pdf

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