>>12160848>IF in orbit refueling works.>There's a lot of ifs.I'm only counting one if, anon.
Anyway, here's how you do on-orbit refueling;
Dock, or berth, join your spacecraft together however you want to
Connect your propellant transfer lines (use couplings based off of those used on every LNG tank facility on Earth)
Adjust the tank pressures such that the receiving tanks are at a lower pressure than the draining tanks
Begin ullage acceleration to cause the propellants to settle at the bottom of the draining tanks
Open the valves to the propellant transfer lines by 5% to chill them down to liquid oxygen/liquid methane temperatures
After a minute of chilldown, open the valves the remaining 95% and allow static pressure to push the propellants across the connections
Manage tank pressures during transfer such that the draining tanks are always at a higher pressure than the receiving tanks
Once the propellants have all been pushed across to the receiving tanks the pressures will equalize as the gasses blow across, which also clears out the lines
Close all valves, set all tank pressures to normal values
Undock/disconnect both spacecraft
Repeat process with next Tanker as necessary
Simple as
