LPG tank water injection system
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Could someone explain the water filling system for the storage tanks at LPG filling stations? The design pressure of the storage tank is 1.77 MPa. If the maximum saturated vapor pressure of the tank at 50°C is 1.6 MPa, how should the head of the feed pump be selected?
We fill the liquefied gas tank with water by using our own independent fire water system to fill the spherical tank. The outlet pressure of the fire pump used can reach 2.2 MPa. Furthermore, as you mentioned, the maximum saturated vapor pressure of the storage tank at 50°C is 1.6 MPa – this is presumably a theoretical value; in reality, such a high pressure cannot be achieved in a spherical tank in the absence of liquid hydrocarbons. If the pressure is high, it is possible to first reduce the pressure in the spherical tank before adding water. Make full use of existing equipment.
What was said upstairs is correct; the water pump used in the design is part of a cyclic process within the system, with water being added again only after the pressure in the spherical tank drops. This allows for the full utilization of existing equipment.