What type of pipe conveys the discharge from toilets and urinals?

The type of pipe that conveys the discharge from toilets and urinals is known as a soil pipe. Soil pipes are specifically designed to transport wastewater, which includes human waste and other solids, from fixtures like toilets and urinals to the sewage system or septic tank. They are designed to handle the heavier flow and solid content of the materials being discharged.

Soil pipes also have a larger diameter compared to other types of pipes, which helps accommodate the potentially greater quantities of water and waste associated with human sanitation. This makes them essential for effective drainage in plumbing systems.

In contrast, drain pipes typically refer to any pipes that carry away wastewater, including those from sinks and showers, but they do not specifically denote the transportation of human waste. Vent pipes are critical for allowing air to enter the plumbing system and preventing a vacuum from forming, but they do not carry wastewater. Waste pipes, while they may sometimes be used in a more general sense, do not specifically denote those pipes used for transporting solid waste from toilets and urinals, which are classified under soil pipes.