Weld Neck Flange

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Weld Neck Flange

Weld-neck flange (WN flange) has a neck that can relocated stress of the pipe, so to reduce the pressure that gathered in the flange bottom. It is compatible to the pipelines that works in high or low temperature and bear high pressure. Specially for the pipe or the valves when PN is larger than 2.5 Mpa.
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Material: Carbon, Alloy and Stainless Steel Standards: ASTM A105, ASTM A182 Sizes: 1/2” to 24”, Customized up to 48” Thickness: Schedule 10(S) to SCH 160 Pressure Ratings: Class 150 to 2500

Two Shapes of Welding-Neck Flange

Welding-neck flange have two forms (shapes), one with reducing neck as we called reducing weld-neck flange; One with a even diameter of typical long neck named as long neck weld flange.

Reducing Weld-Neck Flange

As it’s name it is like a combination of pipe reducer and flange, so it could be welded to a smaller pipe directly.

Applications and Features

Weld-neck flange mainly used in medium, high pressure pipes connecting, most butt weld flange with neck also called nipple flange.

Therefore, the installation cost of the welding flange, labor costs and auxiliary materials costs are higher, because there is more than one process.

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