4 INCH FLANGE WN RF CL150 SCH160 A105 ASME B16.5

Also known as nozzle flanges or “long neck” flanges, these items were designed with the pressure vessel and tank fabrication industry in mind. They are typically made as a one-piece construction with the intention of replacing a standard weld neck and pipe weld combination.

Product Details

        The long tapered hub provides an important reinforcement for use in several applications involving high pressure, sub-zero and or elevated temperatures. The smooth transition from flange thickness to pipe or fitting wall thickness effected by the taper is extremely beneficial, under conditions of repeated bending, caused by line expansion or other variable forces.

     These flanges are bored to match the inside diameter of the mating pipe or fitting so there will be no restriction of product flow. This prevents turbulence at the joint and reduces erosion. They also provide excellent stress distribution through the tapered hub and are easily radiographed for flaw detection.

      This flange type will be welded to a pipe or fitting with a single full penetration, V weld (Buttweld).    

     Weld Neck Flanges are flanges that designed to be joined to a piping system by butt welding. the WN Flange is relatively expensive because of its long neck, but is preferred for high stress applications. The neck, or hub, transmits stresses to the pipe, reducing stress concentrations at the base of the Welding-Neck flanges. The gradual transition of thickness from the base of the hub to the wall thickness at the butt weld provides important reinforcement of the Weld Neck flange. The bore of the Weld-Neck flange matches the bore of the pipe, reducing turbulence and erosion.


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