Because of the small power liquid tank, the system is suitable for oil well, offshore pumping well and densely populated area. For example, in California, the United States, fuel card management system , because many wells located in the towns and offshore, so widely used closed system. In most cases, the closed hydrodynamic system uses water as the power liquid, because of the small friction, the small risk and the little influence on the environment.
However, the use of water as power, automatic fuel dispenser need to add lubricant, and the need for anti-corrosion treatment, these will increase the cost of production management.
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