A backflow assembly is an approved, testable assembly which uses valves in different configurations to prevent polluted or contaminated water from reversing direction and flowing backward. Common uses are on fire sprinkler systems, irrigation systems, boiler make-ups and domestic water services.
A cross-connection control program protects the potable water supply from contaminants and pollutants being introduced into the potable water system by backsiphonage or backpressure. Approved backflow prevention device assemblies are necessary to protect the potable water from cross-contamination. Understanding backflow prevention device assemblies and why they are used requires knowledge of what a cross-connection is and why backflow can occur at a cross-connection.
Backflow devices are a requirement by the NJDEP for all fire services and certain domestic services. They are required to be tested annually, bi-annually or quarterly depending on the degree of hazard. It is also important to note that a backflow prevention device must be installed on any service lines that can result in a backflow condition or pose a significant risk to the water supply. Such as boilers, elevated tanks, fire sprinkler systems, pumps that are designed to propel water to higher floors, lawn sprinkler systems, etc.
Each backflow assembly must be tested and certified upon installation and re-certified by a licensed backflow inspector according to the state mandate