Ryan Bushman Chemical & Backflow Prevention
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Ryan Bushman Chemical & Backflow Prevention

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Ryan Bushman Chemical & Backflow Prevention Presentation Transcript

  • 1. Chemical and Backflow Prevention Ryan Bushman – Inman Interwest Michael Moss – Division of Drinking Water Utah Nursery & Landscape Association January, 2010
  • 2. Purpose:
    • Protect the drinking water supply!
  • 3. Definitions:
    • Backflow - The undesirable reversal of flow of water or mixtures of water and other liquids, gasses or other substances into the drinking water system. Occurs due to a pressure differential between two points within a continuous fluid system.
  • 4. Definitions:
    • Cross Connection - Any actual or potential connection between the drinking water system and any other source or system through which it is possible to introduce into the system any used water, industrial fluid, gas or substance other than the intended potable water.
  • 5. Definitions:
    • Contaminate – Any substance introduced into a drinking water system which creates a threat to public health.
  • 6. Definitions:
    • Pollutant – Any substance introduced into a drinking water system which does NOT create a threat to public health, but adversely and unreasonably affects the aesthetic quality of the water.
  • 7. Definitions:
    • Degree of Hazard – The threat to public health from a contaminate (health) or pollutant (non-health) introduced by a cross connection into the drinking water system.
  • 8. Installation Requirements
    • Available Plumbing Codes
    • ICC - International Plumbing Code
    • IAPMO - Uniform Plumbing code
    • BOCA National Plumbing Code
    • NAPHCC National Standard Plumbing Code
    • ANSI A40 National Plumbing Code
    • State Written Plumbing Code
    • ………….
  • 9. Utah Plumbing Code
    • State of Utah has adopted the 2006 International Plumbing Code (IPC).
    • The State of Utah has 64 amendments to the current IPC.
    • The 2009 IPC requires Legislative Action and approval before adoption. This may not be in effect until July 1, 2010.
  • 10. Installation Hazards
    • Lack of Knowledge
      • Customers
      • Inspectors
      • Councils and Boards
      • Your own personnel
  • 11. Connections for Irrigation System Water
    • Secondary or irrigation supply only
    • Culinary or drinking water supply only
    • Combination of the secondary/irrigation water during the normal season with drinking water connected for early and late season irrigation
  • 12. Secondary Irrigation Water Only
    • No protection is required when the source is separate from and NOT connected or able to be connected to drinking water.
  • 13. Drinking Water Only
    • The adopted plumbing code, Section 608-16-5 REQUIRES that the lawn irrigation system be protected against backflow by an atmospheric vacuum breaker , a pressure vacuum breaker assembly or a reduced pressure principle backflow prevention assembly .
  • 14. Secondary Irrigation Water Supplemented with Drinking Water
    • Separate supply risers
    • Culinary line will be protected by a reduced pressure backflow preventer
    • Swing joint connected to irrigation line
    • Connected to either pressurized irrigation OR culinary, but not both at the same time
  • 15. SPRINKLING SYSTEM PRESSURE IRRIGATION WATER RP SWING JOINT CONNECTION CITY WATER
  • 16. SPOOL CONNECTION SYSTEM
  • 17. Dual Irrigation Connections Swing Connection Irrigation Water Source Drinking Water Source
  • 18. Dual Irrigation Connections Reduced Pressure Principle Backflow Preventer Swing Connection
  • 19. Chemical Injection
    • Fertilizers
    • Pesticides
    • Herbicides
      • Methods …….
        • Pumped
        • Venturi or aspirators
        • Tanks
  • 20. CODE COMPLIANT BACKFLOW PREVENTION ASSEMBLY VALVE BOX The Utah plumbing code, Section 608-16-5, REQUIRES where ‘chemicals’ are introduced into the system, the water supply shall be protected against backflow by a reduced pressure principle backflow prevention assembly. CHEMICAL FEEDER
  • 21. Chemical Injection
    • How does this work?
  • 22. VENTURI EFFECT STATIC CONDITION GAUGE PRESSURE EQUAL
  • 23. 0 200 0 200 0 200 VENTURI EFFECT DYNAMIC CONDITION GAUGE PRESSURE DROPS VELOCITY INCREASES
  • 24. 0 0 0 200 200 200 HIGH VELOCITY FLOW VACUUM POINTS NEGATIVE PRESSURE VENTURI CONDITION DYNAMIC CONDITION - HIGH FLOW RATE
  • 25. Chemical Injection
    • How Can This Process Harm Us?
  • 26. 0 0 0 200 200 200
  • 27. Protection Available
    • Backflow Preventers
      • Air Gap
      • Reduced Pressure Principle Backflow Prevention Assembly
      • Double Check Valve Backflow Prevention Assembly
      • Pressure Vacuum Breaker Backflow Prevention Assembly
      • Spill Resistant Vacuum Breaker Backflow Prevention Assembly
  • 28. Backflow Preventers
    • Air Gap - 2 times the pipe diameter
    • 1” minimum
    • 1 ½” pipe has a 3” air gap
    • If the pipe is less than 2 pipe diameters from a side wall, then the air gap is 3 times the pipe diameter
    • If an 1 ½” pipe is less than 3” from a side wall, the air gap would be 4 ½”
  • 29. Backflow Preventers
    • Reduced Pressure Principle Backflow Prevention Assembly
      • Cannot be used in a pit or vault
      • Must have 12” of clearance all around
      • Air gap must be maintained at the vent port
      • Not subject to water hammer
      • High Hazard
      • Backsiphonage and backpressure
  • 30. Reduced Pressure Principle Backflow Prevention Assembly RELEIF PORT (1) TEST PORTS (4) ISOLATION VALVES (2) MAINTAIN AS AN ASSEMBLY
  • 31. GOOD INSTALLATION
  • 32. PROBLEM INSTALLATIONS Installed Below Grade Installed In Ceiling and is NOT Accessible
  • 33. Backflow Preventers
    • Double Check Valve Backflow Prevention Assembly
      • Low hazard only …
        • not allowed for Utah lawn irrigation system installations per current code (since 2005)
      • May be installed in a pit or vault
      • Must have 12” of clearance for testing and repair
      • Backsiphonage and backpressure
  • 34.  
  • 35. Backflow Preventers
    • Pressure Vacuum Breaker and Spill Resistant Vacuum Breaker Assembly
      • Vertical installations only
      • 12” above the highest piping or point of use
      • Shall not be installed in a pit or vault
      • 12” of clearance for testing and repairs
      • No backpressure (backsiphonage only)
      • High Hazard
  • 36.  
  • 37. PROBLEM INSTALLATION
  • 38. PROBLEM INSTALLATIONS
  • 39. Backflow Preventers
    • Atmospheric Vacuum Breaker
      • 6” above the highest piping or point of use
      • No downstream valves
      • No more that 12 hours of continuous use
      • No pits or vaults
      • High Hazard
  • 40.  
  • 41.  
  • 42. PROBLEM INSTALLATION
  • 43. Backflow Preventers
    • Hose Bib Vacuum Breaker
      • Must be non-removable type
      • Hose bibs only
      • Must be drained for winter (in freezing climates)
      • Majority of all backflow incidents could be prevented with a hose bib vacuum breaker
  • 44.  
  • 45. Annual Testing
    • Reduced Pressure Principle Backflow Prevention Assembly
    • Double Check Valve Backflow Prevention Assembly
    • Pressure Vacuum Breaker Backflow Prevention Assembly
    • Spill Resistant Pressure Vacuum Breaker Backflow Prevention Assembly
  • 46. Annual Check
    • Visually check all high hazard air gaps
    • Devices: atmospheric vacuum breakers, hose bib vacuum breakers, etc.,(visual inspection)
    • Dual check is NOT a double check valve assembly
  • 47. Climate
    • Freezing must be addressed
    • Drained in winter( ball valves left in the half open position)
    • Test cocks opened and left open to drain water between the check valves
    • Above ground year round use must be heated and protected
    • Socio-economic climate (theft or vandalism)
  • 48. Irrigation Hazards
    • No installation or improper installation
      • No hose bib vacuum breaker
      • Valves on the downstream side of an AVB
      • AVB not installed 6” above the highest point of use
      • PVB installed with backpressure
      • Double check valves installed on high hazard
      • Devices installed where assemblies should be
      • No annual testing
  • 49. QUESTIONS?