Which pressure is classified as minimum working pressure in water distribution?

In water distribution systems, minimum working pressure is crucial for ensuring that the water supply remains reliable and effective throughout the network. The minimum working pressure is the minimum pressure that should be maintained under normal operating conditions to ensure an adequate flow of water to consumers.

The correct classification of minimum working pressure is often set at a level that ensures a satisfactory service level, allowing for adequate pressure for domestic and industrial use, as well as fire protection needs. A pressure of 35 psi is typically acknowledged as the standard minimum working pressure for most water distribution systems. This level is sufficient to account for the hydraulic losses and ensures that water can effectively reach high points in a distribution system while still supplying adequate flow rates to consumers at all times.

A pressure that is set higher, such as 40 psi or 50 psi, might provide additional safety margins but is not considered the baseline minimum needed for standard operations. Similarly, lower pressures, such as 20 psi, do not meet the expectations for service delivery and may lead to insufficient water supply or pressure drops when demand is high. Thus, the designation of 35 psi as minimum working pressure represents a balance between operational efficiency and customer service needs in water distribution systems.