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This topic is offered for NewMars members who might wish to consider a specific method for moving cryogenic liquids between storage locations in space without using ullage, rotation or any other artificial gravity solutions.
A tank designed for this system would have a cylindrical cross section, and a port for liquid cryogen on one end.
The movable partition would NOT be tightly sealed to the wall of the tank, but instead would have a small gap through which cryogenic liquid can squeeze when pressure is applied.
The end of the tank opposite the delivery port would contain the material to be pumped in a gaseous state.
In operation, the delivery side of the tank would be filled with liquid cryogen, which would push the movable partition away from the delivery port end.
When the customer vessel is secured to the facility, and the delivery ports in both the station and the vessel are open, gas would be added to the "shove" side of the tank, so that the movable partition is driven against the liquid cryogen, which would then flow through the exit port into the customer vessel.
When the movable partition has moved as far toward the exit as it can, the ports would be closed, and the customer vessel would be free to unclamp from the station.
Meanwhile, gas would be admitted to the front of the cryogenic tank to cause the movable partition to move toward the back.
Alternatively, to save time, liquid cryogen might be pumped into the front of the tank, and that liquid would push the movable partition toward the back of the tank.
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