Blind flange is also called blind flange, and its real name is blind plate. Blind flange is a solid disc used to close a pipe or form a stopper. Similar to ordinary flanges, blind flanges have mounting holes around the periphery and gasket seals are machined on the mating surface. The difference is that the blind flange does not have an opening for fluid to pass through. Instead, it is placed between two open flanges, thereby blocking the fluid from passing through the pipe. This type of closure is often used when adding another pipeline to an existing pipeline or adding a new valve. One of its functions is to block the end of the pipe, and the second is to facilitate the removal of debris in the pipe during maintenance. In terms of the blocking effect, it has the same effect as the head and pipe cap. However, there is no way to disassemble the head, while the blind flange is fixed with bolts and is very convenient to disassemble. The materials of the blind flange are carbon steel, alloy steel, stainless steel, plastic, etc. The blind flange is used to seal the end of the pipeline. There are welded blind flanges and flange covers (flange covers are bolted). Flange covers are blind flanges, and blind flanges are not only flange covers, but also welded blind flanges, butt-wound blind flanges, etc. Where are blind flanges most commonly used? Blind flanges are commonly used in petrochemicals, pipeline engineering, utilities, and water conservancy projects. Blind flanges can be used to repair pipelines upstream. In fact, during pipeline construction, blind flanges can be embedded into the final length of the pipeline. In this way, the pipeline can be extended or continued by simply adding to the final flange. How are blind flanges designed? In the design of blind flanges, there are several key points that we need to pay attention to during design: to design the flange reasonably, that is, to properly design the ratio of the cone neck and flange ring of the alloy flange, so that the flange torque is as small as possible to reduce the various stress indicators of the flange; according to the use conditions, the gasket material and the gasket width are reasonably selected to reduce the preload and operating force of the bolts; the bolt material, bolt diameter and number of bolts are reasonably selected, and the value of the bolt center circle diameter is as small as possible; the flange material is reasonably selected, and the overall design of the flange should be as full stress design as possible to achieve the purpose of both safety and cost saving.
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