A banging noise in a pipe may indicate that pressure is changing too quickly. When a valve closes rapidly or a pump stops abruptly, the change in water movement can generate a pressure wave: water hammer.
The phenomenon in three stages
| 01 · Water flows With the valve open, water flows through the pipe. | 02 · The valve closes Rapid closing slows the upstream water and causes a pressure change. | 03 · The wave propagates The disturbance travels through the installation and may be reflected at other points. |
Noise is a sign. Diagnosis explains the cause.
Water hammer can cause banging, vibration and high loads on pipes, valves, connections and supports. In severe conditions, it may contribute to leaks and equipment damage. However, not all banging noises have the same cause.
What should be assessed in the installation?
- When it happens: when valves close or pumps start or stop.
- How the system works: closing times, network conditions and pump control.
- What protection is needed: solutions against pressure fluctuations, selected and sized for the installation.
Prevention starts with design and analysis of the whole system.
A solution suitable for one installation may not suit another.
At Syst-MP, we assess pumping systems to identify the source of problems and define solutions suited to each installation.
Syst-MP — always pumping.
Technical article | Water hammer: do you hear banging in the pipes?