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eLibrary > M14 Backflow Prevention and Cross-Connection Control: Recommended Practices, Fifth Edition >

M14 Backflow Prevention and Cross-Connection Control: Recommended Practices, Fifth Edition, 2024

METRIC CONVERSIONS
Chapter 1
Introduction
PURPOSE OF MANUAL
SAFE DRINKING WATER ACT
PUBLIC WATER SYSTEM RESPONSIBILITIES
PROTECTING THE PUBLIC HEALTH (Program Implementation)
PUBLIC HEALTH AND PLUMBING CODES
PUBLIC HEALTH PARAMETERS
LEGAL ASPECTS
REFERENCES
Chapter 2
Backflow Prevention Principles
BASIC HYDRAULICS
TYPES OF BACKFLOW
ASSESSING OTHER RISK FACTORS
TYPES OF ASSEMBLIES AND DEVICES
Chapter 3
Cross-Connection Control Program Administration
DEVELOPING A CROSS-CONNECTION CONTROL PROGRAM
TYPES OF CROSS-CONNECTION CONTROL PROGRAMS
MANAGEMENT PROGRAMS
DOCUMENTATION
HUMAN RESOURCES
PROGRAM ADMINISTRATION
Chapter 4
Backflow Prevention Assembly, Device, and Method: Application, Installation, and Maintenance
What IS USED TO PREVENT BACKFLOW
BACKFLOW PREVENTION DEVICES
DUAL CHECK VALVE (DCV)
DUAL CHECK VALVE WITH ATMOSPHERIC VENT (DCVwAV)
ATMOSPHERIC VACUUM BREAKER (AVB)
HOSE BIBB VACUUM BREAKER (HBVB)
BACKFLOW PREVENTION ASSEMBLIES (SPECIFICATION, REQUIREMENTS, AND GUIDELINES)
SPILL-RESISTANT PRESSURE VACUUM BREAKER (SRPVB)
FIELD-TESTING
Chapter 5
Cross-Connection Control Survey
PURPOSE OF A CROSS-CONNECTION CONTROL SURVEY
Survey CONSIDERATIONS AND CONCEPTS
CONDUCTING THE SURVEY
AUTHORITY AND RESPONSIBILITIES
REFERENCES
Chapter 6
Sample Hazards and Proper Protection
TYPICAL HAZARDS
HAZARDS POSED BY A WATER SUPPLIER
PROTECTION FOR SPECIFIC CUSTOMERS
REFERENCES
APPENDIX C
Industry Resources
APPENDIX D
Backflow Incident Case Histories
Glossary
Preface, ix
Table 2-1 Means of backflow prevention in the United States
Table 2-2 Selection guide for backflow preventers in Canada (See Clauses 5.3.1.1 and 5.4.1)
Table 6-1 Recommended protection for solar domestic hot-water systems
Table 6-2 Recommended protection at fixtures and equipment found in water treatment plants
Table 6-3 For containment
Table 6-4 Containment protection
Table 6-5 Typical backflow devices
Table 6-6 Irrigation and hose connection protection
Table 6-7 �Means of backflow prevention in Canada (pending permission) (see Clauses 5.3.1.1 and 5.4.1)
Figure 1-1 Illustration of protective devices and a dedicated line for potable water [Go to Page]
Figure 1-2 Location on private side of property line
Figure 1-3 Location on public entity side of property line
Figure 1-4 Commercial property with fire protection system
Figure 2-1a Example of barometric loop in a piping configuration
Figure 2-1b Example of barometric loop outside building
Figure 2-2 Backsiphonage backflow due to high rate of water withdrawal
Figure 2-3 Backpressure backflow caused by carbon dioxide cylinder
Figure 2-4 Backpressure backflow caused by pumping system
Figure 2-5 Backsiphonage backflow caused by reduced pressure on suction side of booster pump
Figure 2-6 Backsiphonage backflow caused by shutdown of water system
Figure 4-1 Dual check valve
Figure 4-2 Dual check valve with atmospheric port (vent)
Figure 4-3 Atmospheric vacuum breaker
Figure 4-4 Hose bibb vacuum breaker
Figure 4-5 Pressure vacuum breaker assembly—flow condition
Figure 4-6 Pressure vacuum breaker assembly—backsiphonage condition
Figure 4-7 Spill-resistant pressure vacuum breaker—normal flow and backsiphonage conditions
Figure 4-8 Double check valve assembly—flow check valves open
Figure 4-9 Double check valve assembly—backpressure with both check valves closed
Figure 4-10 �Double check valve assembly—subatmospheric supply pressure—check valves closed
Figure 4-11 Typical double check valve assembly—applications
Figure 4-12 �Reduced-pressure principle backflow prevention assembly, both check valves open and the differential pressure relief valve closed
Figure 4-13 Both check valves closed and the differential pressure relief valve open
Figure 4-14 �Backpressure: both check valves closed and the differential pressure relief valve closed
Figure 4-15 �Backsiphonage: both check valves closed and the differential pressure relief valve open
Figure 4-16 Typical reduced-pressure principle backflow prevention applications
Figure 4-17 Double check detector backflow prevention assembly
Figure 4-18 Type II double check detector backflow prevention assembly
Figure 4-19 Reduced pressure principle detector backflow prevention assembly
Figure 4-20 Type II reduced pressure principle detector backflow prevention assembly
Figure 4-21 Air gap on tank
Figure 4-22 Air gap on lavatory
Figure 4-23 Typical air gap applications
Figure 4-24 Additional typical air gap applications
Figure 5-1 �Internal plumbing controlled pursuant to plumbing code and containment assembly used for process water
Figure 5-2 �Service line backflow prevention assembly installed pursuant to statute, internal plumbing controlled pursuant to plumbing code, and containment assembly used for process water
Figure 5-3 Internal plumbing controlled pursuant to plumbing code and containment assembly used for process water and fire system
Figure 5-4 Service line backflow prevention assembly installed pursuant to statute, internal plumbing controlled pursuant to plumbing code, and containment assembly used for process water and fire system
Figure 6-1 Cross-connection control, water treatment plants
Figure 6-2 Service-containment and area-isolation water treatment plants
Figure B-1 Double check valve assembly
Figure B-2 No backpressure
Figure B-3 Backpressure conditions
Figure B-4 DCVA—first check valve differential pressure test step #2
Figure B-5 DCVA—second check valve differential pressure test step #3
Figure B-6 DCVA—No-flow tightness validation test step #4
Figure B-7 Reduces pressure principle backflow prevention device assembly
Figure B-8a RPZ—Step #1, drip tight�Figure B-8b RPZ—Step #1, not drip tight
Figure B-9 RPZ—First check valve differential pressure test step #1A
Figure B-10 RPZ—Second check valve tightness test step #2
Figure B-11 RPZ—No-flow tightness validation test Step #3
Figure B-12 RPZ—Relief valve opening point step #4
Figure B-13 RPZ—Second check valve differential pressure test step #5
Figure B-14 Tee fitting
Figure B-15 Tee fitting connection test cock #4
Figure B-16 Bypass hose connection
Figure B-17 RPZ—Relief valve opening point with tee fitting
Figure B-18 Pressure vacuum breaker
Figure B-19 PVB—Check valve differential pressure measurement step #1
Figure B-20 PVB—No-flow tightness validation test step #2
Figure B-21 PVB air inlet valve test step #3
Figure B-22 PVB—Air inlet valve test leaking upstream shutoff valve step #3A
Figure B-23 Spill-resistant pressure vacuum breaker
Figure B-24 SRPVB—No-flow tightness validation test step #1
Figure B-25 SRPVB—Check valve differential pressure measurement step #2
Figure B-26 SRPVB—Air inlet valve opening point step #3
Figure B-27 Compensating bleed-off valve
Figure B-28 �SRPVB—Check valve differential pressure measurement leaking upstream shutoff valve step #2A
Figure B-29 SRPVB—Air inlet valve opening point leaking upstream shutoff valve step #3A
Figure B-30 NEWWA backflow prevention device assembly test report form
Figure B-31 Sample test report form
Figure B-32 Ground wire installation
Figure B-33 Ground wire installation
Figure B-34 Major component parts of five-valve differential pressure gauge test equipment
Figure B-35 �Differential pressure gauge test kit, five-valve model
Figure B-36 �Differential pressure gauge showing hose connections to test the components of an RPBA
Figure B-37 �Differential pressure gauge showing hose connections to test the #1 check valve of a DCVA
Figure B-38 �Differential pressure gauge showing hose connections to test a PVBA air inlet
Figure B-39 Pressure gauge showing hose connections to test a PVBA check valve
Figure B-40 �Differential pressure gauge showing hose connections to test both the check valve and air inlet of an SVBA
Figure B-41 Test 1—CV #1
Figure B-42 Test 3—CV #2
Figure B-43 Two-valve differential pressure test kit
Figure B-44 Two-valve test kit
Figure B-45 Three-valve test kit
Figure B-46 Reduced-pressure field test with three-valve test kit [Go to Page]

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