18 INCH FLANGE WN RF CL300 SCH40 A182-F304H ASME B16.5

Weld neck flanges are the most popular flange type with a neck extension with a weld bevel at the end, this type of flange is designed to butt weld directly to pipe to provide a superior and relatively natural form connection.

Product Details

        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. They usually have one straight thru bore with a square cut end (instead of the typical weld neck bevel). The overall length of the nozzle flange is up to the end user, and the body of the nozzle can be modified to some pre-existing sizes or custom sizes for additional reinforcement as required. 

        Welding Neck Flanges are easy to recognize at the long tapered hub, that goes gradually over to the wall thickness from a pipe or fitting.

        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).

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