This section provides an overview for blank flanges as well as their applications and principles. Also, please take a look at the list of 9 blank flange manufacturers and their company rankings.
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A blank flange is a type of piping material used in piping systems. It is mainly used to close off the fluid inside a pipe. At production sites, it is commonly called "Mekura flange" or "closed flange."
ANSI is the most commonly used standard for flanges. ANSI is a standard issued by the American National Standards Institute.
Blank flanges are often used in production. In particular, they tend to be used more frequently in process plants than in discrete plants.
The most common use is during equipment downtime. When only a portion of a plant is shut down for overhaul for an extended period, it is necessary to close off the equipment to be serviced so that process liquids and gases do not flow into it. By using blank flanges and bypass piping, it is possible to shut down only the equipment in question without stopping the manufacturing process.
Blank flanges are extremely simple components in construction.
The appearance of blank flanges is round and circular, with a hole in the outer circumference. The holes on the periphery are usually idiot holes, but some are tapped, and they are there to fix a bolt to the piping by inserting it.
The material of the blank flanges varies depending on the process, but commercially available materials such as SUS316L, SUS304, and SS400 are used. The most common selection is to match the piping to be connected.
When connecting the blank flanges and piping, a seal is required to prevent leakage of gas or liquid from the gap. The sealing material is called a gasket, which is inserted between the blank flanges and the piping. Gaskets are made of softer materials than steel and are used according to the temperature and pressure of the process. Copper and other materials are used for high-temperature sections, while rubber and other materials are used at room temperature.
Blank flanges are standardized according to the size of the piping and the process pressure. Pressure is described in units of K (kgf/cm2 and same scale) according to the process pressure.
*Including some distributors, etc.
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