Carbon steel flange not only saves space, reduce the weight, more important is to ensure that the joint parts will not leak, has good sealing performance. Compact flange size is reduced, was due to the decrease of the diameter of the seal, it will reduce the sealing surface of cross section. Second, the flange gasket has been replaced by sealing ring, to ensure that the sealing face sealing surface matching. Thus, in order to close cover only need a small pressure. As the required pressure is reduced, the size of the flat welding flange bolts and required quantity can be reduced accordingly, so the final design out a small volume and light weight (70% ~ 80% reduction in weight than traditional flange) of new products. So flat welding flange a relatively flat welding flange of the high quality product, the quality and reduce the space, has played an important role in industrial applications.

Carbon steel flange manufacturer first introduce flat welding flange sealing principle: the two sealing surface compressive flange bolt and form a sealing gasket, but it also led to the destruction of the seal. In order to keep the seal, will have to maintain a huge bolt force, therefore, the bolt will be bigger. And a bigger bolt will match the bigger nut, flat welding flange which means a larger diameter bolts to create conditions to tighten the nut.

However, the diameter of the bolt, the greater the applicable flat welding flange will become bent, the only way is to increase the flange part of the wall thickness. The whole device will requires a great deal of the size and weight, this in the offshore environment has become a special problem, because in this case the weight of people must concern has always been the main problem. And flat welding flange, fundamentally, flat welding flange is an invalid sealing, it needs to be 50% of the bolt load for dummy blocks, and used to keep the pressure load is only 50%.