Applications of ANSI Long Weld Neck Flanges

2015 September22

Applications of ANSI Long Weld Neck Flanges

Applications involving high pressure and the need for a hub that is long and tapered are what weld neck flanges are most often used for. Specifying the schedule of pipe that it will be utilized for is of utmost importance when ordering. This type of flange is excellent for use in environments involving extreme temperature fluctuations and excessive handling and bending.

Uses for Long Weld Neck Flanges

The uses for long weld neck flanges are predominantly on vessels where an extended neck is required. The uses for long weld neck flanges (LWN) are predominantly on vessels where an extended neck is required. This is deemed to be a specialty flange due to the protruding neck or hub, which acts as a boring extension.

The tapered neck aids in reducing the thickness of the steel and it then seems to be a pipe extension. Steel LWN flanges are chiefly utilized in the chemical and petroleum industries, as well as commercial and residential buildings that experience high levels of stress and temperatures that fluctuate.

Materials for Flanges Based on Applications

Steel pipe flanges have a flat rib, collar or rim that is utilized for guiding or strengthening when attaching two pipes to each other. Materials, sizes and opening dimensions are varying based upon applications that the flanges are designed for and include threaded, socket-wired and slip-on styles.

ANSI Flange Standards

To find all dimensions, as well as dimensional tolerances related to long-neck orifice flanges and ANSI flanges, they are generally included in Section 36/Publication B16 of the American Society of Mechanical Engineers publication. This publication includes fittings and pipes manufactured of wrought copper, steel, cast bronze and cast iron.

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