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Blind flange
Blind flange

Blind flange

Blind disk is the normal name of Flange cover, which is also called blind Flange or pipe plug. It is a flange w...
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Blind disk is the normal name of Flange cover, which is also called blind Flange or pipe plug. It is a flange without hole in the middle, used to seal the pipe mouth. The function is the same as that of the head and the cap, except that the blind plate seal is a removable sealing device, and the head seal is not ready to open again. There are many types of sealing surface, including plane, convex, concave and convex surface, tenon groove surface and ring connection surface. Materials: carbon steel, stainless steel, alloy steel, copper, aluminum, PVC and PPR.

The blind plate is mainly used to completely isolate the production medium, to prevent the lax closing of the cut-off valve from affecting production and even causing accidents. Blind plate should be set in the required parts of isolation, such as equipment nozzle, before and after cutting off valve or between two flanges, often recommend the use of 8 blind plate; Insert board (circular blind board) can also be used for pressing, purging and other disposable parts.

Function and classification of blind plate

Blind plate from the appearance, generally divided into plate plate blind plate, 8 word blind plate, insert plate, and pad ring (insert plate and pad ring each other blind). Blind plate plays the role of isolation, cutting off, and head, pipe cap, welding plug plays the same role. Due to its good sealing performance, it is generally used as a reliable means of isolation for systems requiring complete isolation. A plate-type flat blind plate is a solid circle with a handle used for normally isolated systems. The figure 8 blind plate is shaped like a figure 8, with the blind plate at one end and the throttle ring at the other end, but the diameter is the same as the pipe diameter, so it does not play the role of throttle. 8 type blind plate, easy to use, need isolation, use blind plate end, need normal operation, use throttle ring end, also can be used to fill the blind plate installation gap in the pipeline. Another feature is the easy identification of the installation status.

Application site of blind plate

1. In the initial start-up preparation stage, blind plate shall be set at the connection place between the equipment and the pipeline if the pipeline strength test or tightness test cannot be conducted at the same time with the connected equipment (such as turbine, compressor, gasifier, reactor, etc.).

2. When the device stops, if the pipeline is still running, a blind plate shall be set at the cut-off valve.

3. When the device is multi-series, the main pipe from the outside of the boundary area is divided into several thousand pipe lines into each series, and a yellow plate is set at the cut-off valve of each pipe line.

4. When the device needs to be regularly repaired, checked or switched between each other, and the equipment involved needs to be completely isolated, a blind plate shall be set at the cut-off valve.

5. When charging and replacing gas pipelines (such as nitrogen pipelines and compressed air pipelines) are connected with the equipment, the blank plate shall be set at the cut-off valve.

6. Low point discharge of equipment and pipeline. If the process medium needs to be concentrated in a unified collection system, blind plate shall be set after cutting off valve.

7. The exhaust pipe, drain pipe and sampling pipe of the equipment and pipeline shall be set with blind plate or wire plug behind the valve. Non - hazardous and non - explosive materials are excluded.

8. When the installation is built in stages, the connecting pipes shall be set with huang plate at the cut-off valve for the convenience of subsequent construction.

9. When the device is in normal production, blind plates should also be set for auxiliary pipes that need to be completely cut off.