What should be paid attention to when installing and using quality GOST Blind Flange

Flanges are pipe fittings commonly used in piping systems to connect pipes and connect two devices. There are many types of them, such as integral flanges, threaded flanges, butt welding flanges, flat welding Socket welding flanges, butt welding ring neck loose flanges, flanging ring plate loose flanges, flange covers, etc. However, in real life, everyone has noticed that there is another product called quality GOST Blind Flange, so what is the difference between a flange and quality GOST Blind Flange? How to use quality GOST Blind Flange?

1. The difference between flange and quality GOST Blind Flange

(1) There are holes on the flanges. When connecting, two flanges need to be fastened with bolts. The flanges are sealed with gaskets, which play a role of sealing, or play a temporary role in the experiment; while quality GOST Blind Flange is made of casting or threaded connection or welding. It is a flange without a hole in the middle. It is mainly used for sealing the front end of the pipe and sealing the pipe opening. Its function is the same as that of the head and the pipe cover, and it can be used for shock isolation. , cutting function, but the blind plate seal is a detachable sealing device, the seal of the head is not ready to be opened again, and the flange blind plate can be disassembled, which is convenient for the pipeline to be used again in the future.

(2) Due to the good performance characteristics of the flange, it is widely used in basic projects such as chemical industry, construction, petroleum, sanitation, pipelines, fire protection, etc.; at the connection between equipment and pipelines, especially various process material pipes It is necessary to set up a blind plate when connecting to the boundary area other than the boundary area, but in the pipeline strength test or sealing test, the blind plate cannot be carried out simultaneously with the connected equipment (such as turbine, compressor, gasifier, reactor, etc.)- - Application in the preparation phase of the original launch.

But in fact, there are many similarities between flange and quality GOST Blind Flange. For example, there are many types of sealing surface, including flat surface, convex surface, concave-convex surface, tenon-groove surface, and ring connection surface; used for flange connection, by It consists of a pair of flanges, a gasket and several bolts and nuts. The gasket is placed between the sealing surfaces of the two flanges. After the nuts are tightened, the specific pressure on the surface of the gasket reaches a certain value and then deforms and fills the sealing surface. The unevenness on the top makes the connection tight and leak-free.

2. Installation and use of quality GOST Blind Flange

The quality GOST Blind Flange can still use the flange connection method, that is, the gasket is placed between the sealing surfaces of the two flanges. After the nut is tightened, the specific pressure on the surface of the gasket reaches a certain value and then deforms, and fills up the unevenness on the sealing surface. However, flange blind plates with different pressures have different thicknesses and use different bolts; in oil medium systems, flange blind plates do not need to be galvanized, but they are used for other media When installing the system, the flange blind plate should be hot-dip galvanized, the minimum weight of the galvanized layer is 610g/m2, and the quality of the flange blind plate after hot-dip galvanizing should be inspected according to national standards.

Well, the above is the introduction of the difference between the flange and the quality GOST Blind Flange and the installation and use of the blind flange. I hope it will be helpful to everyone. Only by choosing the flange correctly and installing the flange correctly can it play its sealing role.