Questions about the PSA switching procedure

For purging, it is necessary to start with the equipment before moving on to the pipelines, and with the main lines before the branch lines. During operation, various process parameters must be strictly controlled to ensure that there is no overheating, no overpressure, no excessive liquid level, and no overload

All of this is known; what’s uncertain is the timing. Regarding purging, since the time available is limited, is there any good way to achieve a thorough purge without having to remove the valves?

The switching times are designed by the manufacturer; what PSA can be adjusted is the adsorption time. Regarding purging, we can only do our best, as failing to clean it thoroughly will cause **problems later on**.

The flushing time should be as long as possible; the number of pressure equalization cycles is determined based on the adsorption pressure. Switching between valve states is carried out using the corresponding table. As mentioned by those who are more experienced, when starting up the system, be careful not to increase the pressure too quickly, and monitor the adsorption pressure curve to detect any valve leaks.

The slag in the pipeline causes significant damage to programmable valves; it must be blown clean before the valve is installed

Thank you, I’m very busy. :)

We here also have ten towers, and construction has only just started. Regarding the question raised by the poster, I would like to say this: during the purging phase, there are many valves and frequent disassemblies and reassemblies, which makes many people think it’s a hassle – but this mindset is completely unacceptable. During purging, the blasting method can be used more often; for the parts where control valves need to be removed, short pipes can be used for connection, followed by repeated blasting. After purging is complete, inspections must be carried out, step by step, ensuring that everything is checked thoroughly. Even so, it’s still difficult to guarantee that no problems will arise. Since construction started here, there have been two instances of disruptions in the PSA system; in one serious case, five towers malfunctioned at the same time, which really shocked me. It took some time to identify the causes after analysis, and I still feel uneasy when I think about it

Could the brother on the 8th floor send us your DCS screens and operating procedures? Our project is currently under construction, and the manufacturer has not provided the operating procedures yet; we are working on creating them ourselves. Also, please let us know about any issues you encounter. Thank you! My email address is 13950368292@163.com

Thank you to the original poster for their selfless contribution! :)

Thank you to all the experts for sharing their insights