Final answer:
As much liquid LP-gas as possible should be removed from an underground container through the liquid withdrawal connection. The rate of removal depends on the geological conditions just as the extraction rates for oil and natural gas are influenced by rock porosity and composition.
Step-by-step explanation:
When a container is to be abandoned underground, as much liquid LP-gas as possible shall be removed through the container liquid withdrawal connection. The rate at which LP-gas can be removed is influenced by factors such as the thickness of the seam, its depth, and the difficulty in excavating surrounding rock. Similar to the extraction of oil and natural gas, which are not housed in vast pools but rather within porous rock formations, the material's properties dictate the efficacy with which it can be drawn out.In the context of LP-gas, it is crucial to maximize removal to reduce potential hazards. Given the physical properties of LP-gas, the careful management of its extraction and storage is necessary to maintain safety. An example of efficient fluid management can be seen in the flow-through process used in ballast tanks, where water is taken in through a lower valve and released through an upper opening, circulating multiple times the tank's capacity to ensure thorough flushing.