BACKFLOW PREVENTION ASSEMBLY TESTING MANUAL

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BACKFLOW PREVENTION ASSEMBLYTESTING MANUALLos Angeles County Department of Public HealthEnvironmental ProtectionCross-Connection and Water Pollution Control ProgramTABLE OF CONTENTSTESTING TECHNIQUES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . 1-2CONCEPTS OF BACKFLOW PREVENTIONASSEMBLY TESTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . 3-4SINGLE CHECK TYPE PRESSURE VACUUM BREAKERTUBE TEST PROCEDUREAir Inlet Opening Point . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . 5-6Check Valve Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . 7TWO CHECK TYPE PRESSURE TYPE VACUUM BREAKERTUBE TEST PROCEDUREAir Inlet Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . 8-9Check Valve Operation.

Backflow Prevention Assembly Testing Manual Concept 3 CONCEPTS OF BACKFLOW PREVENTION ASSEMBLY TESTING The following outline is based upon the extensive cross-connection control program and lengthy

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