What is the function of piping within a building called?

The function of piping within a building is primarily referred to as the Water Distribution System. This system is responsible for delivering potable water from the main supply to various fixtures throughout the building, including sinks, showers, toilets, and other plumbing fixtures. It ensures that water is available where needed and at the appropriate pressure.

The Water Distribution System includes various components such as pipes, valves, and fittings that work together to facilitate the flow of water effectively. It plays a crucial role in maintaining water quality and ensuring efficient and safe water delivery within a building.

The other options pertain to different aspects of plumbing in buildings. The Water Service Area typically denotes the external portion of the plumbing system that brings water from municipal supplies to the building. The Main Supply Line refers to the primary pipeline that supplies water to the distribution system, but it does not encompass the entire network of pipes within the building. The Drainage System, on the other hand, is designed for removing wastewater and sewage, which is a separate function from the distribution of clean water.