How to connect and use spectacle blind flanges?
There are three types of spectacle flange:spacer,spade(paddle flange),spectacle blind flange.A spectacle blind flange is a combination of a spade and a spacer.
The connection of spectacle blind plate is applicable to the connection of pipe fittings with diameter of φ 50-315mm. Its performance features: non rigid connection, detachable, tensile resistance. Flange connection is usually used as a detachable connection on the low-pressure transmission pipeline. In order to cut off, if there is no spectacle blind plate in the pipeline, it is difficult to insert the blind plate for isolation operation because there is not enough clearance when cutting off is needed.
The spectacle blind plate is usually set in some occasions where emergency shutdown is required according to the process and safety requirements. According to the definition of Hg / t20570.23-95, the blind plate is mainly used to completely separate the production medium, so as to prevent the production from being affected or even accidents due to the loose closing of the shut-off valve.
The spectacle blind plate does not have bolt holes. It is only used for isolation between two flanges. If pressure test is needed, whether the thickness of the spectacle blind plate can be disassembled in the maintenance process according to the flange or flange cover under the corresponding pressure level. The maintenance and operation are simple. The spectacle blind plate is used continuously in the maintenance process determined by the thickness to ensure important conditions and connection characteristics.
To prevent unnecessary weight to a flange connections,designer usually will choose the seperated two parts (spacer and spade) instead of the spectacle blind flange.
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