Special Flanges – Orifice Flange, Long Weld Neck & Reducing Flange

In this article, I have tried to cover some of the special flanges such as Orifice flange, long weld neck flange, reducing and expanding flanges and flange olet that used in piping and equipment.Special flanges are not as common as regular flanges.

ANSI Flange

The American National Standards Institute (ANSI) calls for the use of an ANSI flange to be used on specific applications. The ANSI flange is a three-part flange consisting of one flat flange, one flange machined to take a rubber O-ring…


Pipe flanges are method of connecting pipes, valves, pumps and other equipment to form a piping system.