Over time, what can cause damage to the pipeline and equipment because it occurs so frequently?

• A. Erosion
• B. Surges
• C. Corrosion
• D. Sedimentation

Answer: (B)

Frequent transient pressure changes cause damage because they subject the pipeline and equipment to repeated, high-stress loading known as pressure surges or water hammer. In a distribution system, actions like quickly closing a valve, starting or stopping a pump, or sudden changes in demand generate pressure waves that travel through the water. These spikes can exceed the system’s normal design pressure, and because they occur many times, the components experience cyclical stress. Over time this fatigue can loosen joints, crack pipes, wear valve seats and fittings, and shorten the life of pumps and other equipment. Erosion, corrosion, and sedimentation affect pipes through gradual, ongoing processes, whereas surges produce abrupt, repetitive stress that accelerates failure. Implementing surge control measures, such as proper valve operation, surge tanks, and slow-start pump controls, helps prevent this kind of damage.