What is the purpose of purging air from a newly installed cold water system?

• A. To prevent corrosion
• B. To sterilize pipes
• C. To remove air pockets and ensure proper water flow
• D. To increase water temperature

Answer: (C)

Removing air from a newly installed cold-water system is done to get rid of trapped air so the pipes fill with water and water can flow freely. When a system is first filled, air tends to collect at high points and fittings. If those air pockets remain, they block smooth flow, cause fluctuating pressure, and can create noises or water hammer when fixtures are used. Purging uses purge valves to flush water through the lines until air is expelled and only water comes out, ensuring reliable supply and proper pressure to all fixtures. Sterilization or disinfection is a separate process, and increasing temperature is not the goal.