120320 backflow prevention
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Transcript of 120320 backflow prevention
Sharing our Guidance
Backflow Prevention
Backflow Prevention
A Brief History of Backflow Prevention
• Recognizing the need for pure water• Double check valves• Major breakthrough in 1929• Safe Drinking Water Act
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Backflow Prevention
We the people, thecitizens, cry out for asolution to our backflowwoes.
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Backflow Prevention
The undesirable reversal of the flow of mixtures of water and other undesirable substance(s) from any source.
• Used water• Industrial fluids• Gases• Any substance other that potable water
What is Backflow?
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Backflow Prevention
1. Backpressure:The user system is at a higher pressure than the supply water system allowing undesirable substances to be “pushed” back into the potable water system.
• Booster pumps• Potable water systems connections to boilers• Interconnection with other piping at higher pressures• Higher elevations (high rise buildings)
Two Types of Backflow
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Backflow Prevention
2. Backsiphonage:When negative or reduced pressure exists in the supply piping allowing undesirable substances to be “drawn” into the potable water system.
• Undersized supply piping• Supply line breaks• Sudden upstream high demand
Two Types of Backflow (cont.)
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Backflow Prevention
Common Devices
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Backflow Prevention
Common Devices (cont.)
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Backflow Prevention
Common Devices (cont.)
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Backflow Prevention
Common Devices (cont.)
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Backflow PreventionCONCLUSION . . .
T H A N K Y O U .