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| DWV Systems | Drain, waste, vent or DWV system is the system of large-diameter pipes that delivers water and sewage to the septic tank or sewer line. Three essential components attribute to this system, in accordance with its name.
Drain connection accumulate water from tubs, sinks and showers; waste lines transmit wastes from lavatories; and vent lines remove sewer gasses and maintain appropriate air pressure to afford unhindered flow of wastes.
Slope of all drain and waste lines is somewhat descending from the fixture in the direction of the sewer or septic system. Water and wastes are moved as a result of ordinary gravitation.
 To minimize the risk of clogging the pipes have large diameter - on average from 1 1/4 inches to 4 inches.
Showers habitually have 2-inch pipe drains while the main soil pipe for toilets is usually a 4-inch pipe. The pipes of 1 1/4-inch to 2-inch diameter are possibly intended for sinks, bathtubs, lavatories and laundry tubs.
However older buildings may have pipes made of lead, galvanized iron vent pipes, and drain pipes which are mainly cast iron, plastic or copper in some houses.
Each drain must be furnished with a vent line that gets rid of sewer gasses through the roof to assure good and safe functioning.
While there is no drain above the point of junction several vents may be joined together and linked to the soil stack. Otherwise vents may move across the roof on its own account.
Come-at-able locations should be dedicated for cleanouts as it is necessary condition for all waste lines. A cleanout is simply a Y-shaped fitting in the line that is capped off. If a locking takes place, this is the most convenient place for a plumber to spend time on the line.
Sink Traps
Drains are protected by traps to prevent odors and sewer gasses from permeating into the house. A trap is a curved section of drain pipe providing a seal when fills up with water.
Drains that stretch through a wall have a P trap and those getting through the floor have an S trap. Whenever the fixture is used the water held by the trap is substituted.
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