Transcription of BACKFLOW PREVENTION ASSEMBLY TESTING MANUAL
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BACKFLOW PREVENTION ASSEMBLY TESTING MANUAL
BACKFLOW PREVENTION ASSEMBLYTESTING MANUALLos Angeles County Department of Public HealthEnvironmental ProtectionCross-Connection and Water Pollution Control ProgramTABLE OF CONTENTSTESTING TECHNIQUES .. 1-2 CONCEPTS OF BACKFLOW PREVENTIONASSEMBLY TESTING .. 3-4 SINGLE CHECK TYPE PRESSURE VACUUM BREAKERTUBE TEST PROCEDUREAir Inlet Opening Point .. 5-6 Check Valve Operation .. 7 TWO CHECK TYPE PRESSURE TYPE VACUUM BREAKERTUBE TEST PROCEDUREAir Inlet Operation .. 8-9 Check Valve Operation .. 10-11 DOUBLE CHECK VALVE ASSEMBLIESTUBE TEST PROCEDUREC heck Valve Operation .. 12-13 SINGLE CHECK PRESSURE TYPE VACUUM BREAKERGAUGE TEST PROCEDUREAir Inlet Operation .. 14-15 Check Valve Operation .. 16 SPILL-RESISTANT PRESSURE VACUUM BREAKERGAUGE TEST PROCEDUREAir Inlet Opening Point .. 17-18 Check Valve Closing Point .. 18 TWO CHECK PRESSURE TYPE VACUUM BREAKERGAUGE TEST PROCEDUREAir Inlet Operation .. 19 Check Valve Operation .. 20-21 DOUBLE CHECK VALVE BACKFLOW PREVENTION ASSEMBLYGAUGE TEST PROCEDUREC heck Valve #1 Operation.
for all backflow prevention assembly testing. Further, field testing of check valves in the direction of flow is the selected technique since it is in conformance with design specifications and laboratory field testing.
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