Ya. Needed them since at least '47.
All the truck and rail car loading facililties I remember had a liquid take off from the bottom of a bullet tank, a separator just before pump, gas going to a compressor going back to the top of the bullet tank, and a vane pump for loading the RC & trucks and another vapor return line from top of the RC & trucks back to the bullet.
Learn from the mistakes of others. You don't have time to make them all yourself.