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Flange blind plate installation and use should pay attention to these two points

Source:Jiangsu Jinchuang Xintian Pipe Industry Co., Ltd. Release time:2022-06-21 14:33:20 Author:3515

Flanges are pipe fittings that are often used to connect pipes and pipes and connect two equipment in pipeline systems. Socket welding flange, butt welding ring with neck loose flange, flanging ring plate loose flange, flange cover, etc. However, in real life, everyone has noticed that there is also a product called flange Blind plate, so what is the difference between a flange and a flanged blind plate? How to use the flange blind plate?

1. The difference between flange and flange blind plate

(1) There are holes on the flanges. When connecting, it is necessary to fasten the two flanges with bolts. The flanges are sealed with gaskets, which play a role of sealing, or play a temporary role in the experiment; while the flanges are blind. The plate is composed 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 mouth of the pipe. , cut off, but the blind plate seal is a detachable sealing device, the seal of the head is not ready to be opened again, the flange blind plate can be disassembled to facilitate the reuse of the pipeline in the future.

(2) Because the flange has good performance characteristics, it is widely used in chemical, construction, petroleum, sanitation, pipeline, fire protection and other basic projects; and at the connection between equipment and pipelines, especially various process material pipes Connecting to the boundary area other than the boundary area, setting the blind plate is necessary, but in the pipeline strength test or sealing test, the blind plate cannot be performed at the same time with the connecting equipment (such as turbines, compressors, gasifiers, reactors, etc.)- - Application of the original boot preparation phase.

But in fact, there are many similarities between flanges and flange blind plates. For example, there are many types of sealing surfaces, including flat surfaces, convex surfaces, concave-convex surfaces, tongue-and-groove surfaces, and ring connection surfaces. 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 gasket surface reaches a certain value and deforms and fills the sealing surface. The unevenness on the top makes the connection tight and leak-proof.

2. Installation and use of flange blind plate

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