Regarding the issue of multiple blind flanges on one device
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The other electrolyzers are operating normally, while one electrolyzer has been shut down for maintenance. This electrolyzer has two gas-phase pipelines and multiple liquid-phase pipelines, with the liquid-phase pipelines carrying brackish water, concentrated brine, pure water, and caustic soda. When applying for permits for blind plate installation and removal, is one permit required for each blind plate, or one permit for multiple blind plates? Looking forward to your reply!
I think the gas phase and the liquid phase should be separated, especially the gas phase – hydrogen is an explosive gas, so it should be sealed off using water. In cases where water sealing isn’t possible, blind flanges must still be used to disconnect that part from the system. If the liquid phase is not flammable or explosive, a ticket can be issued. Personal opinions.
One blind plate, one certificate – this is beyond doubt. It should also be managed in this way. Otherwise, it is easy to miss something when removing the blind flange later.
Our ticket allows for multiple blind plates, but each one comes with a clear description, specifications, location, number, as well as a schematic diagram.
Multiple blind plates require only one certificate, and the certification process can involve step-by-step verification.
It’s a bit cumbersome to require a certificate for each blind plate, which affects work efficiency. A ticket can be issued on which the locations of each blind flange are clearly indicated; it is required that a visible marker be attached to each blind flange at the site, so that they can be identified one by one during installation and removal.
It’s a bit cumbersome to require a certificate for each blind plate, which affects work efficiency. A ticket can be issued on which the locations of each blind flange are clearly indicated; it is required that a visible marker be attached to each blind flange at the site, so that they can be identified one by one during installation and removal. Agreed!
If the tasks are completed by the same work team on the same day, they can all be included in one ticket, with the ticket listing all the plugging and unplugging tasks. However, each valve used for isolating by plugging or unplugging blind flanges requires a red tag to prevent others from operating it.