Large ships can provide self-sufficient drinking water. For this purpose, the ships are equipped with reverse osmosis systems, which withdraw the dissolved salt from the inedible seawater for humans and prepare the urgently needed drinking water. The ships can take water from the sea outside the 15-mile zone.
Before the seawater gets into these reverse osmosis plants, it is disinfected with chlorine and then stored in tanks. Immediately before desalination, the chlorine in the seawater must be eliminated again, so that the sensitive membranes of the reverse osmosis plants are not damaged. Once desalinated, the seawater is chlorinated again before being pumped back into large storage tanks. In these tanks, the water is stored for later use. The need for water depends very much on the time of day.
Both chlorination and dechlorination (with sodium hydrogen sulphite) determine the desired water values using the measuring and control technology. The dosing of the different chemicals is handled by ProMinent dosing pumps and complete dosing systems.
Another way of drinking water supply is the bunkering of drinking water in ports. Here, the water tanks of the ships are filled with drinking water from the urban drinking water network via hoses. In order to guarantee the sterility of the water here as well, the water is disinfected by adding a proportionate amount of chlorine before it reaches the ship. This work is also done by dosing pumps or dosing systems. The result is determined and documented by the measuring and control technology.