What is the purpose of using separate foam concentrate piping?

• A. To keep concentrate separate from the water supply and prevent contamination of potable water or sprinkler water
• B. To prevent contamination of potable water by keeping concentrate separate from the water supply
• C. To reduce the system's overall height
• D. To allow foam to mix with air before entry

Answer: (B)

The main idea is to protect the potable water supply from chemical contamination by keeping the foam concentrate piping separate from the water supply. Foam concentrates contain chemicals that, if they entered the drinking water system, could pose health and safety risks. By isolating the concentrate piping and using proper backflow protection and a dedicated proportioning device, the concentrate can be blended with the water only where needed, without any chance of leaking back into the potable water lines.

That’s why this choice is the best: it directly addresses the crucial goal of preventing contamination of drinking water. The other ideas aren’t the purpose here—reducing system height or letting foam mix with air aren’t the reasons for separating the concentrate piping, and the system is designed to mix foam with water, not air, at the proportioning stage.