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A welding neck flange (WN) features a long tapered hub that can be welded with a pipe. This flange type is used, normally, in high-pressure and high/low temperatures applications that require an unrestricted flow of the fluid conveyed by the piping system (the bore of the flange matches with the bore of the pipe). The absence of pressure drops prevents negative effects as turbulence and erosion/corrosion of the metals in the proximity of the flanged joints. The tapered hub allows a smooth distribution of the mechanical stress between the pipe and the weld neck flange and facilitates the execution of radiographic inspections to detect possible leakages and welding defects. The dimension of the flange (NPS and the pipe schedule) shall match the dimension of the connecting pipe.
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A welding neck flange features a long tapered hub designed for butt welding to a pipe. It is used in high-pressure and high or low temperature applications where unrestricted flow is required, as the flange bore matches the pipe bore. The tapered hub provides smooth mechanical stress distribution and facilitates radiographic inspection of welds. Dimensions (NPS and pipe schedule) must match the connecting pipe.
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