What is the primary function of a vent pipe in a drainage system?

The primary function of a vent pipe in a drainage system is to relieve pressure. Vent pipes are essential for maintaining balance in the drainage system by allowing air to enter, which facilitates the proper flow of wastewater by preventing the formation of vacuums. When wastewater moves through the drains, it can create negative pressure, potentially leading to slow drainage or even clogs. By allowing air in, the vent pipe ensures that waste can flow freely and efficiently to the sewer line without disruption.

Additionally, vent pipes help to release any sewer gases, improving safety and sanitation by preventing these gases from entering the living space. They do not supply water, transport waste, or connect to a sewer line, which are specific functions of other plumbing components. The role of a vent pipe is critical in establishing an effective drainage system that functions smoothly and safely.