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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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PowerPoint Slideshow about ' Backflow Prevention' - raymond-dickson


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Presentation Transcript
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
slide28
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
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