Normally, gas can be withdrawn from the rear of the trailer with all dip tubes oriented upward (to the vapor phase). Liquid can be withdrawn from the front of the trailer where the dip tubes will be oriented downward into the liquid phase.

• 通常所有汲取管朝上（以接触气相），从拖车的后部提取气体。可以从拖车的前部提取液体。在前部，汲取管向下伸入到液相里。