What is the difference between flange and blind flange

As we all know, pipes are usually connected by some kind of pipe fitting, which we call “flange”. However, in real life, many of us don’t know about flange and blind flange, and there are often mixed situations. Therefore, the small series specially sorted out the differences between flange and blind flange. The specific explanations are as follows:

1. Their characteristics are different

The normal name of flange blind plate is flange cover, and some are called blind flange or plugging pipe. It is a kind of flange without hole in the middle, which is mainly used for the front end of pipe seal and sealing mouth. Its function is the same as the head and cover, but the blind plate seal is a detachable sealing device. The sealing of the head is not ready to be opened again. The flange blind plate is made of carbon steel, alloy, stainless steel, plastic, etc. the function of the flange blind plate is the same as that of the head and the pipe cover Its sealing performance is good. For the system that needs to be completely separated, the blind plate is a kind of solid with handle, which is generally used to isolate the general state of the system. It is convenient to use the flange blind plate for separation. The end of the blind plate needs normal operation. The yellow throttle ring can also be used to fill the installation gap of the blind plate on the pipeline.

A flange, also known as a flange or raised edge, is the part connecting the pipe, usually at the end of the pipe, with holes in the flange. When connecting, the two flanges need to be tightened with bolts. The flange is sealed with gasket, which can seal or play a temporary role in the test. Flange is a common disc part in pipeline engineering. Generally speaking, the flange is one-to-one used. According to the different connection methods, the flange is divided into threaded connection flange, welding flange and clamping flange. The low-pressure pipeline can be threaded connection flange and welding flange, and the pressure can exceed 4kg.

2. They are different in application

(1) The application of flange, due to its good performance characteristics, is widely used in chemical engineering, construction, petroleum, sanitation, pipeline, fire protection and other basic engineering.

(2) In the pipeline strength test or sealing test, the blind plate in the original start up preparation stage cannot be used simultaneously with the connecting equipment, so blind plate must be set at the connection between equipment and pipeline. All kinds of process material pipes are connected in the boundary area outside the boundary area. When the equipment stops running, the blind plate should be set at the shut off valve.