What is a primary benefit of including pressure tanks in an irrigation system?

• A. Increase the pump power consumption
• B. Elongate pump lifespan and reduce water hammer
• C. Increase the risk of water hammer
• D. Replace the need for a controller

Answer: (B)

Pressure tanks cushion rapid pressure changes in an irrigation system. When valves close quickly, the moving water creates shock waves known as water hammer, which can stress pipes and fittings and cause the pump to start and stop more often. A pressure tank provides a compressed air cushion and a small water reserve, absorbing those pressure spikes and keeping pressure steadier. This damping reduces water hammer and minimizes short cycling of the pump, so the pump works less hard over time. With fewer starts and stops, the motor and pump components wear more slowly, extending pump life. The result is more consistent pressure for better sprinkler performance as well. The other options don’t reflect this benefit: the tank doesn’t increase power use, it reduces water hammer rather than raising it, and it doesn’t replace the need for a controller.