Spectacle blind is a kind of pipe parts, mainly for the convenience of maintenance. You can paint the upper half of "8" black. It's half blind plate and half iron ring. It is commonly used for pipeline flanges that need to change the process. The materials are mainly carbon steel, stainless steel and alloy, which can be selected according to the pipeline pressure grade and pipeline medium.
The significance of use is usually used on pipelines with large pipe diameters. Usually, one end of the flange is used to occupy the space to keep the pipeline unblocked, and when necessary, the blind plate with the same thickness at the other end is used to cut off the pipeline. Avoid the forced expansion of the pipeline caused by the temporary replacement of other blind plates, which will affect the whole system.
The blind plate plays the role of isolation and cutting, which is the same as that of the head, pipe cap and welding plug. Because of its good sealing performance, it is generally used as a reliable isolation means for systems that need complete isolation. The plate type blind plate is a solid circle with a handle, which is used for the system in an isolated state under normal conditions. The spectacle blind plate is shaped like a spectacle, with a blind plate at one end and a throttling ring at the other end, but its diameter is the same as the pipe diameter and does not play a throttling role. The spectacle blind is easy to use. When isolation is required, the blind end is used. When normal operation is required, the throttling ring end is used. At the same time, it can also be used to fill the installation gap of the blind on the pipeline. Another feature is that the identification is obvious and it is easy to identify the installation status.
The blind flange shall not be galvanized when used in oil medium system, but shall be hot-dip galvanized when used in other medium systems. The minimum weight of galvanized layer is 610g/m2, and the hot-dip galvanizing quality inspection shall be in accordance with cb*/z343.
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