Similarly, if the air is not replaced behind the water as it moves, it would create negative pressure, sucking the water out of the trap. If the air were allowed to push back, this would cause the wastewater to back up through the plumbing fixture and come out the drain, which would have obvious health consequences, to say nothing of the odor. This pressure buildup must be released somehow, or the positive pressure will push back on the water. But when water moves through the pipe, it compresses the air ahead of it, creating a positive pressure. Air Pressure In Sewer Lines Is RegulatedĪs mentioned, the air pressure in sewer pipes is the same up and down the length of the pipe. If the air pressure were unequal, the water would be sucked out toward the section of the pipe with the lower pressure. The vents also keep the air pressure the same on both sides of the trap. This enables bacteria to break down the sewage aerobically, meaning by the use of oxygen. The vent pipes also allow oxygen into the waste pipes. The vent pipes allow the sewer gases to escape to the outside, rather than being released inside the house. Plumbing vents are pipes that extend from the waste pipes to the outside of the building, often going through the roof. Because of the bend, this section of pipe holds or traps water, and this prevents noxious gases from entering the house. ![]() ![]() TrapsĮvery plumbing fixture in the house, such as drains, faucets, toilets, must have a trap, which is a bend or loop in the pipe near the fixture. This allows water and sewage to flow freely down the pipes by the force of gravity alone. The vent also helps to regulate air pressure in the plumbing pipes to ensure that the water flows unimpeded through them.ĭrain waste vent systems help to keep the air pressure in the pipe neutral, meaning that the pressure is the same throughout the length of the pipe. In plumbing, a vent, or more precisely, a drain waste vent, helps to remove sewage and greywater from a building or home.
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