Why is it important to purge air from an irrigation system before startup?

Why is it important to purge air from an irrigation system before startup?

• A. Air pockets can cause pressure fluctuations, poor valve operation, misting, and noise; purging ensures proper flow and head performance.
• B. Air purging cools the system.
• C. Air purging cleans filters.
• D. Air purging increases fertilizer efficiency.

Answer: (A)

Purising air from irrigation lines is about removing trapped air so the water can move smoothly and the system behaves predictably. When air pockets are in the pipes, the flow becomes inconsistent—pressure can spike or drop, valves may not seat or open properly, sprinklers can mist or spray erratically, and you’ll hear more noise from rapid air-water movement. Clearing those pockets before startup helps the water fill the pipes evenly, keeps pressures steady, and ensures each head gets the proper flow and throw pattern. This is usually done by venting at purge points and running the system until a steady, air-free stream comes from the outlets. Purging doesn’t cool the system, clean filters, or boost fertilizer efficiency, so those aren’t the benefits here.

Purising air from irrigation lines is about removing trapped air so the water can move smoothly and the system behaves predictably. When air pockets are in the pipes, the flow becomes inconsistent—pressure can spike or drop, valves may not seat or open properly, sprinklers can mist or spray erratically, and you’ll hear more noise from rapid air-water movement. Clearing those pockets before startup helps the water fill the pipes evenly, keeps pressures steady, and ensures each head gets the proper flow and throw pattern.

This is usually done by venting at purge points and running the system until a steady, air-free stream comes from the outlets. Purging doesn’t cool the system, clean filters, or boost fertilizer efficiency, so those aren’t the benefits here.