Gravity piping and pressure piping are two different types of piping systems, the main difference being the source of power for the flow of the fluid through the piping. The following is a detailed description:

Gravity piping. Utilizes natural gravity to drive fluid flow without adding additional pressure internally, this type of piping is commonly used in drainage, sewage treatment, water irrigation and other fields such as sewers, etc. In this type of piping, liquids or gases can flow freely using their own gravity, and usually require smaller pipe diameters in higher-positioned portions and larger pipe diameters in lower-positioned portions.

Pressure piping. The fluid inside the pipe is made to flow by the pressure exerted from outside, this kind of pipe needs to be pressurized inside in order to maintain the normal transportation of the fluid, commonly used in the transportation of gases, water, oil, steam and other media, the pressure pipeline needs to be equipped with pumps or compressors and other equipments to maintain the pressure inside the pipe, in order to push the liquid or gas to a higher place, this kind of pipeline system is suitable for the scenarios that need to be transported for long distances or at high pressures.