backflow prevention
DESCRIPTION
Backflow Prevention. Cross Connection Control. Cross Connection Control Charleston Mt. Pleasant Summerville. Polluted versus Contamination. Pollutant risk – color or odor Contaminant risk – health hazard. Polluted versus Contamination. Irrigation considered contamination risk - PowerPoint PPT PresentationTRANSCRIPT
Backflow Backflow PreventionPrevention
Cross Connection Cross Connection ControlControl
Cross Connection ControlCross Connection ControlCharlestonCharlestonMt. PleasantMt. PleasantSummervilleSummerville
Polluted versus Polluted versus ContaminationContamination
Pollutant risk – color or odorPollutant risk – color or odor Contaminant risk – health hazardContaminant risk – health hazard
Polluted versus Polluted versus ContaminationContamination
Irrigation considered Irrigation considered contaminationcontamination risk risk
Pesticides and fertilizersPesticides and fertilizers
Cross Connection
Cross connection is any connection Cross connection is any connection between potable and non-potable between potable and non-potable waterwater
BacksiphonageBacksiphonage
Backsiphonage is the reverse flow of Backsiphonage is the reverse flow of waterwater
BacksiphonageBacksiphonage
Cross Connection
Back pressureBack pressure
Back pressure is continuous Back pressure is continuous pressure back toward potable waterpressure back toward potable water Elevation exampleElevation example
BACKFLOW PREVENTERSBACKFLOW PREVENTERS(Can be TESTED)(Can be TESTED)
Reduced pressureReduced pressure (RP) (RP)
MostMost pressure loss pressure loss $180 $180 Backpressure, Backpressure,
pressure relief valvepressure relief valve Avoid water Avoid water
submersion of relief submersion of relief valvevalve
12 psi loss12 psi loss
Reduced pressureReduced pressure (RP)(RP)
BACKFLOW PREVENTERSBACKFLOW PREVENTERS(Can be TESTED)(Can be TESTED)
Reduced pressureReduced pressure (RP) (RP) 12” 12” above groundabove ground installation installation
Reduced pressureReduced pressure (RP)(RP)
BACKFLOW PREVENTERSBACKFLOW PREVENTERS(Can be TESTED)(Can be TESTED)
Pressure Vacuum Breaker (PVB)Pressure Vacuum Breaker (PVB) Spring-loaded check valves and air-Spring-loaded check valves and air-
inlet prevent backsiphonage inlet prevent backsiphonage onlyonly Not intended for backpressureNot intended for backpressure $70 cost$70 cost 5 psi loss5 psi loss
Pressure Vacuum Breaker Pressure Vacuum Breaker (PVB)(PVB)
BACKFLOW PREVENTERSBACKFLOW PREVENTERS(Can be TESTED)(Can be TESTED)
Pressure Vacuum Breaker (PVB)Pressure Vacuum Breaker (PVB) 12” 12” above highest headabove highest head installation installation
BACKFLOW PREVENTERSBACKFLOW PREVENTERS(Can be TESTED)(Can be TESTED)
Double Check ValveDouble Check Valve Spring loaded check valves onlySpring loaded check valves only
No relief valveNo relief valve 5 psi loss5 psi loss
Double Check ValveDouble Check Valve
BACKFLOW PREVENTERSBACKFLOW PREVENTERS(CANNOT be TESTED)(CANNOT be TESTED)
Dual check valveDual check valve Spring loaded check valves onlySpring loaded check valves only
BACKFLOW PREVENTERSBACKFLOW PREVENTERS(CANNOT be TESTED)(CANNOT be TESTED)
Atmospheric Vacuum Breaker (AVB) Atmospheric Vacuum Breaker (AVB) Float inletFloat inlet Not intended for continuous pressureNot intended for continuous pressure One for One for everyevery valve, 6” above highest valve, 6” above highest
headhead Cheapest Cheapest 2 psi loss2 psi loss
Atmospheric Vacuum Atmospheric Vacuum Breaker (AVB)Breaker (AVB)
BACKFLOW PREVENTERSBACKFLOW PREVENTERS(CanNOT be TESTED)(CanNOT be TESTED)
Anti-Siphon ValveAnti-Siphon Valve Control valve with built-in AVBControl valve with built-in AVB
OTHER BACKFLOW OTHER BACKFLOW PREVENTIONPREVENTION
AIR GAPAIR GAP Breaks vacuum of backsiphonageBreaks vacuum of backsiphonage
OTHER BACKFLOW OTHER BACKFLOW PREVENTIONPREVENTION
HOSE BIBHOSE BIB Vacuum breakerVacuum breaker attachment attachment
INSTALLATIONINSTALLATION
Install after POCInstall after POC A licensed plumber must tap into A licensed plumber must tap into
potable water systempotable water system Exception is homeowner that can tap Exception is homeowner that can tap
into own water supplyinto own water supply
INSTALLATIONINSTALLATION
COPPER PIPECOPPER PIPE
Two feet of copper (type K) in ground, Two feet of copper (type K) in ground, before and after backflow preventerbefore and after backflow preventer RigidityRigidity ExposureExposure
DHECDHEC
South Carolina Department of South Carolina Department of Health and Environmental Control Health and Environmental Control (DHEC)(DHEC)
http://www.scdhec.gov/http://www.scdhec.gov/environment/water/dwbflow.htmenvironment/water/dwbflow.htm
Copper PipeCopper Pipe
Sweating copper pipeSweating copper pipe
Copper PipeCopper Pipe
Sandpaper or emery cloth to clean Sandpaper or emery cloth to clean pipepipe
Copper PipeCopper Pipe
Flux surfacesFlux surfaces Helps draw in solderHelps draw in solder
Copper PipeCopper Pipe
Dry-fit pipe and fittingDry-fit pipe and fitting
Copper PipeCopper Pipe
Heat pipe connectionHeat pipe connection
Copper PipeCopper Pipe
Touch joint with solderTouch joint with solder Melts and draws insideMelts and draws inside
Copper PipeCopper Pipe
TESTINGTESTING
Tested annually by licensed testerTested annually by licensed tester Certified BF inspectorCertified BF inspector DHEC, John Watkins 803-898-3567DHEC, John Watkins 803-898-3567 3 day class ($225)3 day class ($225) Equipment ($700)Equipment ($700) http://www.scdhec.gov/http://www.scdhec.gov/
environment/water/dwbflow.htm environment/water/dwbflow.htm