DN400 FULL FACE WELD NECK FLANGE STD WT 150#

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. In larger sizes and higher pressure classes, this is almost exclusively the type of flange connection utilized.

Product Details

       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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