Basic Wastewater Operator Practice Exam

What should be avoided by closing valves slowly?

1. Water sledge

2. Water saw

3. Water blasting

4. Water hammer

The correct answer is: Water hammer

Closing valves slowly is important to avoid the occurrence of water hammer. Water hammer is a hydraulic shock that occurs when there is a sudden change in the flow of water. This can happen if a valve is closed too quickly, leading to a rapid deceleration of water flow and the formation of pressure waves. These pressure changes can result in damaging vibrations within the pipes, which can cause noise, wear, and even failure of the piping system. By closing valves slowly, you allow the water flow to decelerate gradually, which helps to prevent the abrupt pressure change that triggers water hammer. This practice not only prolongs the life of the piping system and connected equipment but also contributes to safer and more efficient operation of the wastewater treatment system.