Backflow Prevention. Preventing backflow is a matter of avoiding the reverse flow of unwanted substances into the drinking water by using special plumbing devices and practices. Preventing backflow is accomplished by requiring physical plumbing methods (air-gaps) or requiring the installation of mechanical devices (backflow prevention assemblies or devices) designed specifically to prevent backflow within certain customer premises. Fairfax Water hydrant meters are supplied with dual check valves (3β meters) and vacuum breakers (5/8β meters) to help protect against cross-connections and backflow events. If a hydrant meter is being used to fill a tank or container, further protection is needed by utilizing an air-gap separation between the hose and whatever is being filled. The air-gap must be a separation of two times the size of the inside diameter of the water supply pipe between the pipe outlet and the flood rim level of the tank, container, and/or basin with a minimum of 6 inches. A hose must never be submerged into the water while filling a tank, container, or pool. Any equipment such as tank trucks and/or portable water tanks that are filled using the hydrant meter shall be properly equipped to prevent contamination of the water system from backflow or backsiphonage. The use of any hydrant meter in a manner that jeopardizes the Fairfax Water supply and violates the Fairfax Water Cross-Connection Control and Backflow Prevention Program Manual shall be grounds for immediate confiscation of the meter and potential charges and/or prosecution.
Appears in 3 contracts
Sources: Fire Hydrant Use Permit Agreement, Fire Hydrant Use Permit Agreement, Fire Hydrant Use Permit Agreement