Water Distribution · Pumps and Pressure
What Is Surge or Water Hammer?
A rapid change in water velocity can create a pressure wave called surge or water hammer. Fast valve movement, pump trips, check-valve closure, and sudden demand changes are common triggers.
Evidence may include sharp pressure transients, banging, pipe movement, relief operation, check-valve slam, or failures that appear after an event. High-speed data may reveal changes that normal displays miss.
The loudest location may not be the source, and simply restraining a moving pipe does not remove the hydraulic cause. The whole event sequence must be reconstructed.
After a power interruption, compare pump trip timing, valve closure, pressure traces, and surge-control status before restarting. Follow the approved sequence and inspect for damage.
Key point: A rapid change in water velocity creates a pressure wave called surge or water hammer. The loudest spot may not be the source.
Keep learning
Water Distribution Fundamentals
This page comes from the course. It covers mains and valves, storage, pumps and pressure, water quality, backflow, main work and daily operations, one step at a time, with short knowledge checks and a certificate of completion.
Take the course