Do you need a blind plate for nitrogen replacement in circulating hydrogen compressor pipeline?

As the name implies, the figure-eight blind plate is shaped like a number 8. It has a blind plate at one end and a throttle ring at the other end. Throttle ring is used when conveying fluid, and blind plate is used when cutting off, which is a bit like a cut-off valve. It can be used to cut off the valve when it leaks. Its sealing performance is better. For systems that need complete isolation, it is generally chosen as a reliable isolation means. There should be two stop valves before and after the 8-shaped blind plate. After all closed, replace the 8-shaped blind plate. Putting-in-service and standby of ordinary heat exchangers, putting-in-service and standby of reactors, connection of nitrogen pipelines and process pipelines, etc. Another feature is that the logo is obvious, and it is easy to identify its installation status.

The main function of the figure-eight blind plate is to completely cut off, just like the function of 100% reliable and error-free gate valve.

General purpose:

System medium pipelines, such as steam purging pipeline and oil process medium pipeline, play the role of safe isolation. At this time, the 8-shaped blind plate should be installed on the side close to the system medium pipeline. Of course, for the figure-eight blind plate disassembled online, there should be a gate valve partition near the process medium pipeline, and such figure-eight blind plates are generally marked as normally closed.

2. The flammable or toxic medium pipeline in and out of the device shall be equipped with a double gate valve, and a splayed blind plate shall be installed at the double gate valve. This figure-eight blind plate is generally marked as normally open.

3. The equipment will be used at startup. The pipeline that no longer passes through the medium after normal start-up should be equipped with gate valves, and the 8-shaped blind plate should be installed on one side of the pipeline with normal five-medium circulation. The figure 8 blind plate is generally marked as normally closed.

When choosing the 8-shaped blind plate, it should match the flange for clamping, and the length of the bolt for clamping should be appropriately lengthened according to the thickness of the blind plate.

There is only one function of installing the figure-eight blind plate: absolute partition. That is, in important parts. Although there are valves in many places, the reliability of the valves is difficult to grasp.