Stainless steel ANSI B16.5 pipe fitting welding neck flange (WN)

Butt welding flange with neck refers to a kind of flange with tapered neck and butt welding with cylinder or pipeline. It is an integral flange.
Due to the transition structure of the cone neck and the butt welding connection, the strength and rigidity of the flange are strengthened, and the sealing performance is better than that of the flat welded flange. The disadvantage is that it needs to be manufactured with forgings, which consumes many materials and has a large manufacturing cost. It is suitable for occasions with high pressure and temperature or high requirements for sealing.

Products range:

Difference between butt welding flange with neck and flat welding flange with neck
First, the welding form is different: the welding form of the flanged pipe with a neck is a fillet weld, and the welding weld form of the necked butt welding flange and the pipe is a circular weld;

1: Different materials: The flange material with neck flat welding is processed with thick ordinary steel plates as required, while the flange material with neck butt welding is mainly made of forged steel parts.

2: The nominal pressure is different: the nominal pressure of the neck-welded flange is 0.6 ~ 4.0MPa, and the nominal pressure of the neck-welded flange is 1 ~ 25MPa.

Second, the welds with neck butt welding flanges and pipes belong to category B welds, and the welds with neck flat weld flanges and pipe joints belong to category C welds, and the nondestructive testing after welding is different.
3: The neck flat welding flange and the neck butt welding flange cannot be replaced at will. In terms of manufacturing angle, the neck flat welding flange (SLIPON for short) is large, small in weight, and low in cost. In addition, butt welded flanges with a nominal diameter greater than 250 mm (WN is short for WELDINGNECK) should also be tested at low cost.