A weld neck flange is a type of pipe flange that incorporates a cast-in neck that is welded to the pipe. Unlike a plain flange that is slipped over the pipe prior to being welded into place, a weld neck flange has a spout-like neck that is beveled to match up to the pipe. Once the pipe is beveled to match the weld neck flange, a perfect V shape is created in which a butt weld is placed to connect the two components.
The benefit of a weld neck flange is that the welded connection does not interfere with the flow of liquid through the flange. By placing the weld joint at the end of the funnel-like neck of the flange, the pipe is much easier to align to the flange, and a stronger weld is typically possible with this type of flange. The flange’s neck is also perfectly beveled to demonstrate the type of bevel that the welder must place on the pipe before making the connection with the flange.
The Welding neck flanges is normally referred to as the high hub flange. It is designed to transfer stresses to the pipe, thereby reducing high stress concentrations at the base of the flange.
The welding neck flange is the best designed butt-welded flange of those currently available becuase of its inherent structural value. It is expensive because of the design.
| Product name : weld neck flange | |
A Weld Neck Flange is drilled with the wall thickness of the Flange having equal dimensions to the matching pipe. The lighter the pipe is the larger the bore is in the Weld Neck Flange. And conversely the heavier the pipe is the smaller the bore is in the Weld Neck Flange. Weld Neck Flanges are usually used in high pressure systems and are suitable for cold or hot temperatures. |
Standards, Dimensions & Weight of Welding Neck Flanges
- ASME/ANSI B16.5 Class 150 WN
- ASME/ANSI B16.5 Class 300 WN
- ASME/ANSI B16.5 Class 600 WN
- ASME/ANSI B16.5 Class 900 WN
- ASME/ANSI B16.5 Class 1500 WN
- ASME/ANSI B16.5 Class 2500 WN
- ASME B16.47 Series A 150 WN
- ASME B16.47 Series A 300 WN
- ASME B16.47 Series A 600 WN
- ASME B16.47 Series A 900 WN
- ASME B16.47 Series B Class 150 WN
- ASME B16.47 Series B Class 300 WN
- ASME B16.47 Series B Class 600 WN
- ASME B16.47 Series B Class 900 WN
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