What should the distribution system pressure during a fire never drop below?

The correct answer indicates that the distribution system pressure during a fire should never drop below 20 psi. Maintaining this pressure is critical for several reasons.

First, a pressure of 20 psi ensures adequate flow and pressure in the pipes, which is essential for delivering water effectively to fire hydrants and firefighting equipment. This supply must be sufficient to combat fires, and a higher pressure allows for an optimal volume of water to be available.

Additionally, dropping below this threshold can lead to issues such as inadequate water supply for extinguishing fires, which can hinder firefighting efforts and put lives and property at risk. Low pressure can also compromise the system's ability to protect against backflow contamination, potentially jeopardizing the quality of the drinking water supplied to the community.

Overall, adhering to this minimum pressure standard is vital for public safety during fire emergencies and for the effective functioning of the water distribution system.