Weld Neck Flange
Product Description
1. Product Introduction
The distinguishing feature of a Weld Neck Flange is its long, tapered hub — often called the 'tapered bored' or 'welding neck' — which is butt-welded to the end of the pipe. This hub serves two critical mechanical functions: first, it provides a full-strength butt-weld joint that is at least as strong as the pipe itself; second, the tapered bore transitions the pipe's inside diameter gradually into the flange's bolt circle, eliminating the sudden step or ledge that occurs with slip-on or socket-weld flanges. This smooth transition dramatically reduces stress concentrations at the weld area — the most common failure point in high-pressure flanged systems — and provides a clear bore through the flangethat eliminates turbulence and product accumulation. The Weld Neck Flange is the only flange type recommended for severe cyclic service, high-pressure/temperature applications, and flammable or toxic media where leak integrity is paramount. Its superior fatigue resistance makes it the default choice in refinery process lines, boiler feedwater systems, offshore platform piping, and any application where the consequences of flange joint failure are severe.
2. Product Features
- Sizes from 1/2" to 80" NPS cover the entire pipeline diameter range
- Pressure ratings: CL150, CL300, CL600, CL900, CL1500, CL2500 and PN10/PN16/PN40
- Long tapered hub provides full butt-weld joint strength equal to the pipe
- Smooth bore-to-flange transition eliminates turbulence and stress concentrations
- Raised Face (RF), Flat Face (FF), and Ring Type Joint (RTJ) facing options
- Bore-to-pipe match available for zero restriction flow path
- Materials: carbon steel, alloy steel, stainless steel for all process conditions
- Standards: ASME B16.5, ASME B16.47, AWWA C207, MSS SP-44, EN 1092-1
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