What components are essential in a branched drain system?

Essential Components

A branched drain system typically consists of a main line, branch lines, and individual fixtures such as sinks, showers, and washing machines. The main line is the primary pipe that carries greywater from the branch lines to the treatment or disposal area. The branch lines are smaller pipes that connect individual fixtures to the main line. Each branch line should be sized to accommodate the flow rate from the corresponding fixture, typically 1/2 inch for a shower and 1 inch for a washing machine. The drain regulators are crucial in preventing backflow into the branch lines and should be installed at the junction of the main line and each branch line. Check valves are also essential in preventing backflow and should be installed in the branch lines to ensure that greywater flows only one way.

Fixture Connections and Cleanouts

Each fixture should be connected to the branch line using a drain trap or P-trap to prevent sewer gases from entering the system. The cleanouts are essential for maintenance and should be installed at regular intervals along the branch lines to allow for easy access and cleaning. Typically, cleanouts are installed every 10-20 feet, and a 4-inch cleanout should be installed at the end of each branch line. Additionally, a cleanout should be installed at the junction of each branch line and the main line.