Explain the phenomenon of water hammer, including its definition, causes, and remedies.

Let's break down water hammer.

a) Define water hammer:
Water hammer is a banging or knocking sound in plumbing pipes caused by a sudden change in water flow velocity, which creates a pressure surge.

b) Causes of water hammer:
The primary causes of water hammer are:

• Sudden closure of valves (e.g., faucets, washing machine valves), which abruptly stops the moving water.
• High water pressure in the system.
• Loose pipes that are not properly secured, allowing them to vibrate against supports or walls.
• Air trapped in the pipes, which can compress and expand, causing noise.

c) Remedies of water hammer:
Remedies for water hammer include:

• Installing water hammer arrestors (shock absorbers) near quick-closing valves to absorb pressure surges.
• Securing loose pipes with pipe clips or straps to prevent movement.
• Bleeding air from the system by running all faucets until the water flows smoothly.
• Reducing overall water pressure in the system by installing a pressure reducing valve if the pressure is excessively high.
• Replacing faulty or worn-out valves that close too quickly.