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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

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Cross connection control
Cross Connection Control

Cross Connection Control

Charleston

Mt. Pleasant

Summerville


Polluted versus contamination
Polluted versus Contamination

  • Pollutant risk – color or odor

  • Contaminant risk – health hazard


Polluted versus contamination1
Polluted versus Contamination

  • Irrigation considered contamination risk

  • Pesticides and fertilizers


Cross connection
Cross Connection

  • Cross connection is any connection between potable and non-potable water


Backsiphonage
Backsiphonage

  • Backsiphonage is the reverse flow of water




Back pressure
Back pressure

  • Back pressure is continuous pressure back toward potable water

    • Elevation example


Backflow preventers can be tested
BACKFLOW PREVENTERS(Can be TESTED)

Reduced pressure(RP)

  • Most pressure loss

  • $180

  • Backpressure, pressure relief valve

  • Avoid water submersion of relief valve

  • 12 psi loss



Backflow preventers can be tested1
BACKFLOW PREVENTERS(Can be TESTED)

Reduced pressure(RP)

  • 12” above ground installation



Backflow preventers can be tested2
BACKFLOW PREVENTERS(Can be TESTED)

Pressure Vacuum Breaker (PVB)

  • Spring-loaded check valves and air-inlet prevent backsiphonageonly

  • Not intended for backpressure

  • $70 cost

  • 5 psi loss



Backflow preventers can be tested3
BACKFLOW PREVENTERS(Can be TESTED)

Pressure Vacuum Breaker (PVB)

  • 12” above highest head installation


Backflow preventers can be tested4
BACKFLOW PREVENTERS(Can be TESTED)

Double Check Valve

  • Spring loaded check valves only

    • No relief valve

  • 5 psi loss



Backflow preventers cannot be tested
BACKFLOW PREVENTERS(CANNOT be TESTED)

Dual check valve

  • Spring loaded check valves only


Backflow preventers cannot be tested1
BACKFLOW PREVENTERS(CANNOT be TESTED)

Atmospheric Vacuum Breaker (AVB)

  • Float inlet

  • Not intended for continuous pressure

  • One for every valve, 6” above highest head

  • Cheapest

  • 2 psi loss



Backflow preventers cannot be tested2
BACKFLOW PREVENTERS(CanNOT be TESTED)

Anti-Siphon Valve

  • Control valve with built-in AVB


Other backflow prevention
OTHER BACKFLOW PREVENTION

AIR GAP

  • Breaks vacuum of backsiphonage


Other backflow prevention1
OTHER BACKFLOW PREVENTION

HOSE BIB

  • Vacuum breaker attachment


Installation
INSTALLATION

  • Install after POC

  • A licensed plumber must tap into potable water system

    • Exception is homeowner that can tap into own water supply


Installation1
INSTALLATION

COPPER PIPE

Two feet of copper (type K) in ground, before and after backflow preventer

  • Rigidity

  • Exposure


Backflow prevention
DHEC

  • South Carolina Department of Health and Environmental Control (DHEC)

  • http://www.scdhec.gov/environment/water/dwbflow.htm


Copper pipe
Copper Pipe

Sweating copper pipe


Copper pipe1
Copper Pipe

  • Sandpaper or emery cloth to clean pipe


Copper pipe2
Copper Pipe

  • Flux surfaces

    • Helps draw in solder


Copper pipe3
Copper Pipe

  • Dry-fit pipe and fitting


Copper pipe4
Copper Pipe

  • Heat pipe connection


Copper pipe5
Copper Pipe

  • Touch joint with solder

    • Melts and draws inside



Testing
TESTING

  • Tested annually by licensed tester

  • Certified BF inspector

  • DHEC, John Watkins 803-898-3567

  • 3 day class ($225)

  • Equipment ($700)

  • http://www.scdhec.gov/environment/water/dwbflow.htm