We all know that pipes are usually connected by some kind of pipe fittings, which we call "flanges". However, in real life, many people will not be able to distinguish between flanges and blind flanges, and they often get confused. Therefore, the editor specially sorted out the differences between flanges and flange blind plates. The specific explanation is as follows:
1. The characteristics of flange and blind flange are different:
The normal name of the flange blind plate is called flange cover, and some are called blind flange or pipe plug. It is a flange without a hole in the middle, which is mainly used to seal the front end of the pipe and to seal the pipe mouth. Its function is the same as the head and tube cover, except that the blind plate seal is a detachable sealing device, and the seal of the head is not ready to be opened again. Flange blind plate materials include carbon steel, alloy, stainless steel, plastic, etc. The flange blind plate plays a role of shock isolation and cutting. The sealing head and pipe cover have the same function, because of its good sealing performance, which is suitable for systems that need to be completely isolated. It is generally used as a means of constant seismic isolation, and the blind plate is a physical property with a handle, which is generally used for the general situation in the isolation state system. It is more convenient to use the flange blind plate, the identification of the flange blind plate is obvious, and the installation status is easy to identify.
Flanges, also called flanges or raised edges, are the parts that connect the pipe, usually at the end of the pipe. There are holes in the flanges. When connecting, two flanges need to be fastened with bolts. The flange is sealed with a gasket to play a role of sealing, or play a role of temporary disconnection in the experiment. Flange is a common disc part in pipeline engineering. In general, flanges are used in pairs. According to different connection methods, flanges are divided into threaded connection flanges, welding flanges and clamping flanges. Threaded flanges can be used for low-pressure pipelines, and welded flanges for pressures above 4 nominal pressures.
2. The application of flange and blind flange is different:
(1) Application of flanges-because flanges have good performance characteristics, they are widely used in basic projects such as chemical industry, construction, petroleum, sanitation, pipelines, and fire fighting.
(2) In the pipeline strength test or sealing test, the blind plate cannot be used at the same time as the connected equipment (such as turbines, compressors, gasifiers, reactors, etc.)-the application of the initial start-up preparation stage. It is necessary to set a blind plate at the connection between the equipment and the pipeline. Various process material pipes are connected to the boundary area outside the boundary area. When the equipment is stopped, if the pipeline is still running, a blind plate should be set at the shut-off valve.
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