The Most Common Flange Types in the Oil and Gas Industry

A flange is a projecting rim or collar on a pipe for a pressure vessel. When used in combination with another flange, it is capable of sealing a pressure vessel or another pipe. This is a reliable way of connecting pipe or vessel systems. The four core-standards for flanges are:

  • API – used for large diameter carbon pipes
  • MSS – used for steel pipeline
  • AWWA – used for water work

Flanges are not a one-type-fits-all solution. Matching the idle flange design of a piping system, an intended usage will ensure the reliable operation of said system. There are six different types of flanges:

  • Blind flange: This is used to close the ends of a pipe which ensures no flow or leakage.
  • Lap joint: This connects to a like stub end to the end of a pipe; it’s used in combination with a sealable joint or pressure vessel.
  • Slip-on flange: This flange is available in an extensive range of sizes and is used to accommodate a system with a significant rate flow and throughout.
  • Socket weld flange: This is ideal for small pipe diameters in low temperature and pressure systems. This flange utilizes a socket weld joining to attach the flange to the pipe or tube.
  • Threaded: This flange can be attached without welding and is often described as a screwed flange. This method works as both an advantage and disadvantage. The advantage is you don’t need a welder to attach it; just match the thread to the connecting pipes. The major disadvantage is it can be prone to leaks; therefore, a threaded flange is commonly used on smaller pipes.
  • Weld Neck: This flange is recognized by its hub on the neck, designed to match the inner side of a pipe. A weld neck flange needs a butt weld to install. This type of flange is popular for pipe processing as it can withstand high pressure and temperatures. This creates a reduction in erosion and turbulence.

We hope this article has provided you with a basic understanding about what a flange is and an understanding about why the flange is important. Without flanges, the many valves, pipe fittings, and other equipment used in formulating a pipe system would not work efficiently.

For a trusted, knowledgeable, and reliable provider of flanges and other vital components, please contact us today at Lynco Flange & Fitting!

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