What is a pressure vessel flange?

Pressure vessel flange is the commonly used connecting part in pressure vessel, and it is the basic part connecting all parts and pipes of pressure vessel.Pressure vessel flanges are widely used in petrochemical industry, electric power, atomic energy, light industry and other modern industrial fields.The flange of high pressure vessel is a set of components composed of flange, gasket, matching stud, nut, etc.The purpose of flanges is to ensure that the connecting parts do not leak, so that different containers or pipes are combined together.

ANSI ASME B16.5 A350 LF2 RF RTJ blind flanges

ANSI ASME B16.5 A350 LF2 RF RTJ blind flanges

Operating principle of pressure vessel flange: in the design and selection of container flange, the overall sealing performance is the priority factor.When the flange bolts are fastened, the bolt pressure will push the gasket over the flange ring, which will cause the gasket to compress and deform.With the increase of bolt force, flange sealing surface is closely combined with sealing gasket to prevent leakage of fluid medium and form the initial sealing environment.

Forged steel flange hydro pressure test

Forged steel flange hydro pressure test

At this time, the pressing force is called the initial sealing specific pressure of sealing gasket. When the pressure vessel or pipeline is loaded with medium, the bolt is stretched by pressure and becomes longer, the flange sealing surface moves along the direction of separation, the compression force between the sealing surface and the sealing gasket decreases, and the specific pressure of the pre tightening seal decreases. At this time, the qualified sealing gasket has good resilience, which can make up for the separation degree of bolt and sealing surface, and make the pre tightening sealing specific pressure drop within the specified range of working sealing specific pressure,so that the flange can still maintain a good sealing working state. On the contrary, if the rebound capacity of gasket is insufficient, the specific pressure of seal drops below the specific pressure range of working seal, or there is a gap on the sealing surface, the seal fails.

In the next article, we will talk about the factors that affect the sealing effect of the pressure vessel flange. If you have similar questions,you can pay more attention to Hebei Haihao Group’s website,we will do some short knowledge explanations of flange from time to time.Email:sales@haihaogroup.com

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