How many manholes must be installed for each change in direction for building sewers with diameters of 10 inches or more?

In plumbing systems, particularly for building sewers with diameters of 10 inches or more, best practices dictate that one manhole should be installed for each change in direction. The purpose of a manhole is to provide access for maintenance and inspection, as well as to enable effective cleaning of the sewer line.

When there is a change in direction — such as a bend or a turn in the piping — a manhole facilitates these essential maintenance activities by allowing personnel to reach the sewer line easily. Additionally, installing one manhole per change in direction helps to promote proper flow dynamics within the sewer system, minimizing potential blockages and backing up of waste.

In larger diameter pipes, where movement of flow can create more significant challenges, having the right number of access points is crucial to the integrity and performance of the system. Thus, adhering to this standard promotes longevity and efficiency in sewage management, making the installation of one manhole the recommended practice for each directional change.