China DIN 2627, DIN 2628, DIN 2629, DIN 2638 Welding Neck Flanges (PN160-400), Find details about China DIN 2627 Flange, DIN 2628 Flange from DIN 2627, DIN 2628, DIN 2629, DIN 2638 Welding Neck Flanges (PN160-400)
DETAILS OF WELDING NECK FLANGE![]() 1. Weld Neck flange 2. Butt Weld 3. Pipe or Fitting |
Welding Neck Flanges is the correct terminology to be used as per ASME B31.3 and ASME B16.5. However in the industry welding neck flanges are commonly referred to as weld neck flanges or WN flanges. The Welding Neck Flange consists of a tapered hub which is secured to the pipe by a full penetration butt weld. Because of the additional reinforcement area available in the hub of weld neck flange and due to its installation by welding, the hub becomes an integral part of the pipe. This gives a weld neck flange greater strength and integrity and ability to withstand considerably higher bending moments than a slip-on flange. Since weld neck flanges are secured to pipe by butt-welding, the internal diameter of the hub end should match the internal diameter of the pipe end. The details of matching pipe ID or wall thickness are required to be specified for purchasing weld neck flanges.
Advantages of Welding Neck Flanges
Following are the advantages of weld neck flanges: