Which piping configuration is designed to provide constant pressure or flow when pipes need repair?

• A. Grid or Loop
• B. Primary Feeder
• C. Combination
• D. Gravity

Answer: (A)

Redundancy through looping is what keeps pressure steady when part of the system is being worked on. A grid or loop network forms a continuous ring with multiple parallel paths between points. If a valve is shut for repairs in one section, water can flow around the loop from another direction, so pressure at the outlets remains more constant and flow can continue where it's needed. This contrasts with a single main feeder, where isolating a portion can cause a noticeable drop in pressure downstream. Gravity-fed systems rely on elevation rather than active pressure maintenance, so they don’t provide the same constant flow during repairs. A loop is the configuration specifically designed to preserve pressure and flow under maintenance conditions.