Regarding the issue of pouring liquid from gas cylinders

I was wrong; can the receiving tank accept liquid while also taking in the liquid poured out from the pouring tank?

This should work; it’s equivalent to two feed streams, as long as the two do not affect each other.

It is generally not allowed to do this. There are two types of tank transfer: one is done using a compressor, and the other is done using a hydrocarbon pump. The operating procedures for these two methods differ; for transfer using a compressor, it is necessary to connect both the gas phase valve and the liquid phase valve at the same time. . . The operation process also needs to be monitored at all times to avoid accidents. While you are pouring the liquid out, you are still adding liquid in – where does that liquid come from? A tank truck? If it is a tank truck, then there are also procedures for unloading, and unloading can be carried out using either hydrocarbon pumps or compressors, each with its own set of procedures. Each has two methods, resulting in four combinations in total; for example, a compressor can be used for transferring liquid from one tank to another, while a pump is used for unloading. Whether it is a pump or a compressor, both require liquid and gas pipelines connected to the receiving tank, and in some cases the receiving tank may not have enough pipelines available for such operations. So it is generally not allowed to do this; there are too many points of operation, which makes it impractical and unsafe. . .