Which system is designed to provide constant pressure or flow when pipes on the grid must be repaired?

• A. Grid or loop
• B. Primary feeder
• C. Pressure-reducing service
• D. Standby distribution

Answer: (A)

A grid or loop distribution provides constant pressure or flow during maintenance because the piping forms a closed network with multiple paths from the water source to every area served. When one section is shut for repairs, water can still reach outlets through alternate routes in the loop, keeping pressure relatively steady and ensuring fire protection remains active. This redundancy is what distinguishes a looped system from a single feed, where isolating a portion can cause noticeable pressure drops. The other options describe different roles (a main supply line, devices to reduce pressure, or an alternate standby source) that don’t inherently guarantee constant pressure when parts of the grid are taken out of service.