Why is the installation of the 8-character blind plate always done behind the valve?
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Is this merely a habit or a rule?
Close the valve then:victory: to facilitate maintenance work on the 8-character blind unit
How can you remove the blind flange if it’s not installed behind the valve?
It’s determined by the work and on-site conditions; adding it at the beginning would hinder operations. :)
When 8-character blind plates are installed at both ends of a pipeline as needed, the ends need to be swapped. If they are installed in front of a valve, how can they be removed and swapped?
Hehe, just by looking at this question, it’s clear that the person asking has only just started working and hasn’t undergone any maintenance training. :The purpose of installing a blind plate is to provide more effective isolation, preventing leaks from within the valve or through it due to other reasons, thereby facilitating maintenance or other operations on the equipment downstream of the valve. If it is installed upstream of the valve, it will make switching difficult in the future, and the valve will no longer serve any purpose.
It’s not necessarily the case either; for example, the piping for the equipment should be installed in front of the valve, depending on the actual circumstances.
Installed in front of the valve and connected to external systems; it isolates the external systems during purging and replacement, allowing this valve to be used to control the purging process for this system
The purpose of installing a blind plate is to provide more effective isolation, preventing leaks from within the valve or through it due to other reasons, thereby facilitating maintenance or other operations on the equipment downstream of the valve. If it is installed upstream of the valve, it will make switching difficult in the future, and the valve will no longer serve any purpose.
It could also be installed in front of the valve; it depends on the specific circumstances. In any case, it serves to cut off flow, acting like a blind flange.
If it’s installed in front of the valve, then no valve is needed; a valve is installed to facilitate disassembly and replacement.
Installing a blind flange behind the valve is a waste of resources! This must be done!
Could the moderator explain why the device is installed in front of the valve?
The purpose of installing a blind plate is to enhance safety during maintenance. If it is ensured that the valve does not leak, then the blind plate serves no purpose. How can a blind plate be installed when there is a fluid present in front of the valve? Not to mention how it will be taken down in the future. Safety first.
As mentioned above. When the valve is in the closed position, it cannot be guaranteed to be completely shut off; that is why blind plates are used. Blind plates can be installed either before or after the valve; it mainly depends on how far they are from the main equipment. In the basic towers I’ve seen, blind plates are placed in front of the reaction vessels, and then the valves come next
Whether to install it at the front or the back depends mainly on the operating conditions. For example, in the case of two towers connected in parallel, the outlet pipeline from the bottom of each tower should be installed in front of the valve, while the inlet pipeline should be installed behind the valve. If one of the towers needs to be regenerated or repaired, that tower is first shut down, cleaned thoroughly, and then the blind flange is placed in a closed position to allow for regeneration or repair; the other tower does not need to be shut down, which helps to avoid shutting down the entire system. After the regeneration or repair is complete, the blind flange is moved to an open position so that the tower can be restarted and integrated back into the system. [Last edited by 702shj on 2009-3-28 19:54]
For the import pipelines of general equipment, blind plates are installed behind the valves; at the equipment outlets, blind plates are generally placed after the valves. The function of blind plates is to isolate the system. Judgment should be based on the actual circumstances