How far apart should shut-off valves be located in main lines?

Shut-off valves in main lines are crucial for isolating sections of the system for maintenance, repairs, or emergencies. The established standard for the distance between shut-off valves is typically 1000 feet. This spacing allows operators to effectively manage and contain issues that may arise in the water distribution system.

By having valves positioned at this interval, it ensures that a relatively large section of the main line can be isolated without compromising too much of the overall system, thereby maintaining service to most customers while allowing effective work on the shut-off section.

The other distances provided are either too short or too long compared to industry standards, which could lead to inefficiencies in managing the water distribution network. For instance, valves too close together may create unnecessary complexity and redundancy, while those spaced too far apart may not provide adequate control over the system in case of a malfunction or repair needs.