How many check valves must a fire protection system using water from the potable water distribution system be equipped with?

A fire protection system that utilizes water from the potable water distribution system is required to have two check valves to ensure proper operation and safety. One check valve is typically installed to prevent backflow from the fire protection system into the potable water supply, safeguarding the drinking water from potential contamination. The second check valve provides an additional layer of protection against backflow, ensuring that even if one valve were to fail, the system still has a backup mechanism in place.

This two-valve setup is critical because it adheres to plumbing codes and regulations aimed at protecting public health. It is standard practice in the industry to employ such measures for systems that connect to potable water to mitigate risks associated with cross-connection and backflow. The installation of multiple check valves helps maintain potable water quality and is a key aspect of fire protection system design.