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Subject: The meaning of Companion Flange

Question:

What type of Flange do people mean to refer to when they speak of a Companion Flange?

Answer:

About Companion Flanges, the term refers to any flange that fits together in Companion to another flange. In oilfield language, persons may call blind, threaded, test, and weld neck flanges, "Companion Flanges" the way adults may call children of every stripe, "kids." At WOODCO USA we casually describe all loose flanges (meaning not integral with an equipment body), with the sealing surface on one side and a pipe thread entrance on the other, as Companion Flanges. Only flanges with drilled through bolt circle holes fit this category.

The flange shown below, a scale illustration of a 2-1/16" 5M flange, has a 2-3/8" EUE 8 Round thread as shown. This flange also may commonly have a 2" Line-Pipe thread. Persons may call this flange, with either thread, a Companion Flange. Calling this flange shown, a 2-1/6" 5M flange, threaded 2-3/8" EUE 8 Round, will provide a much more reliable description.

 

Today, some technical documents, e.g. API Spec 6A, categorize the flanges sometimes called Companion Flanges as "loose connectors" or "loose flanges", and the definition of this category includes blind, threaded, test, and weld neck flanges, as well as those with tap end studs, e.g. DSA's, etc.

For more about Flanges, and a brief history, Click Here.

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