Questions about reverse osmosis high-pressure pumps
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The high-pressure pump used for reverse osmosis requires protection switches for low pressure at the inlet and high pressure at the outlet. How does this protection mechanism work? How does the chaining work?
The main function of low-pressure protection is to prevent the security filter from becoming clogged, which could otherwise lead to cavitation in the pump, while high-pressure protection is generally used to avoid the pump operating at low flow rates for extended periods of time. Therefore, it is necessary to refer to the pump’s performance curve: 1. Set the low-pressure interlock value to the pressure corresponding to the pump’s rated operating conditions, plus the saturated vapor pressure at the water temperature under those rated conditions, plus a margin of 0.1 kilograms ； 2. Set the outlet high-pressure protection value to the pressure corresponding to the pump’s minimum flow rate, and then subtract 0.05 kilograms (this is mainly to account for the error in the pressure switch). For reference.
Thank you for your reply! There are pressure setpoints at the pump’s inlet and outlet; does the pump shut down immediately when the inlet pressure is below or the outlet pressure is above these setpoints? How was it shut down? It should be a interlock between low-pressure or high-pressure signals and electrical signals.
I’m not sure about the size of your system; if it’s a relatively large system, it is usually controlled by PCL, and there may also be a backup high-pressure pump. In this case, the PLC typically controls the start of the backup pump, allowing the system to continue operating. For some smaller systems, such as those with a flow rate of 1 m3/h, they are usually controlled by a circuit system (relay + timer), which is also very convenient. I used a system this small before; it was set up in this way and worked quite well.
The system is quite large; it is a full-membrane treatment system for power plants. I have already learned it; thank you so much!
This depends on the manufacturing process; generally, after installing the pressure switch, it is possible to trigger an alarm first, and then choose to stop the machine either when the level is too high or too low.
Are you referring to the water level alarm of the tank?