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Water supply - Backflow prevention devices Materials, design and performance requirements

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29-05-2024

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AS/NZS 2845.1:2010

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English

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05-03-1998

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Standards Australia

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1 - AS/NZS 2845.1:1998 WATER SUPPLY-BACKFLOW PREVENTION DEVICES - MATERIALS, DESIGN AND PERFORMANCE REQUIREMENTS
4 - PREFACE
5 - CONTENTS
10 - SECTION 1 SCOPE AND GENERAL
10 - 1.1 SCOPE
10 - 1.2 APPLICATION
11 - 1.3 REFERENCED DOCUMENTS
11 - 1.4 DEFINITIONS
11 - 1.4.1 Air ports
11 - 1.4.2 Atmospheric air
11 - 1.4.3 Back siphonage
11 - 1.4.4 Certifying body
11 - 1.4.5 Component
11 - 1.4.6 Critical installation height (CIH)
11 - 1.4.7 Critical installation level
11 - 1.4.8 Critical level (CL)
11 - 1.4.9 Independently acting non-return valve
11 - 1.4.10 Pollution
11 - 1.4.11 Ports (vents)
12 - 1.4.12 Rated flow
12 - 1.4.13 Stiction
12 - 1.5 TOLERANCES
12 - 1.6 INSTRUMENTATION
12 - 1.7 PRESSURE RATING
13 - SECTION 2 MATERIALS
13 - 2.1 GENERAL
13 - 2.2 COMPONENTS
13 - 2.3 SPRINGS AND CIRCLIPS
13 - 2.4 STAINLESS STEEL
13 - 2.5 FILLER METALS
13 - 2.6 NICKEL-COPPER-IRON
13 - 2.7 FERROUS MATERIALS
13 - 2.8 ALUMINIUM ALLOYS
14 - 2.9 CORROSION-RESISTANT METALLIC MATERIALS
14 - 2.10 PLASTICS
14 - 2.11 CONTAMINATION OF WATER
15 - SECTION 3 COMMON DESIGN AND PERFORMANCE REQUIREMENTS
15 - 3.1 GENERAL
15 - 3.2 PRESSURE AND TEMPERATURE RANGES
15 - 3.3 DESIGN
15 - 3.3.1 Serviceability
15 - 3.3.2 Release of trapped air
15 - 3.3.3 Flexible valve seats and diaphragms
15 - 3.4 END CONNECTIONS
15 - 3.4.1 Threaded end connectors
15 - 3.4.2 Compression ends
15 - 3.4.3 Union ends
15 - 3.4.4 Flanged ends
15 - 3.4.5 Hose connections
15 - 3.4.6 Test tap outlets
16 - 3.4.7 Water meter connection ends
16 - 3.5 NON-RETURN VALVES
16 - 3.6 STRUCTURAL TESTS
16 - 3.6.1 General
16 - 3.6.2 Torque
16 - 3.6.3 Hot water
16 - 3.6.4 Positive pressure
16 - 3.6.5 Reverse pressure
16 - 3.6.6 Ultraviolet
17 - 3.6.7 Endurance
17 - 3.6.8 Non-testable devices (low hazard)
17 - 3.6.9 Long-term positive pressure test for plastic-bodied devices
17 - 3.7 TEST SEQUENCE
19 - SECTION 4 ATMOSPHERIC VACUUM BREAKERS (AVB)
19 - 4.1 GENERAL
19 - 4.2 APPLICATION
19 - 4.3 COMPONENTS
19 - 4.3.1 Ventilation valve
19 - 4.3.2 Non-return valve
19 - 4.4 SPECIFIC DESIGN REQUIREMENTS
19 - 4.4.1 Air port shields
20 - 4.4.2 Critical level mark
20 - 4.5 PERFORMANCE TESTS
20 - 4.5.1 Air port opening area
20 - 4.5.2 Water rise
20 - 4.5.3 Rated waterflow capacity and pressure loss
20 - 4.5.4 Ventilation valve leakage
20 - 4.5.5 Endurance
20 - 4.5.6 Critical level
21 - SECTION 5 HOSE CONNECTION VACUUM BREAKERS (HCVB)
21 - 5.1 GENERAL
21 - 5.2 APPLICATION
21 - 5.3 COMPONENTS
21 - 5.3.1 Ventilation valve
21 - 5.3.2 Non-return valve
21 - 5.4 SPECIFIC DESIGN REQUIREMENTS
21 - 5.4.1 Air ports locations
21 - 5.4.2 Air ports opening area
21 - 5.4.3 Security
22 - 5.5 PERFORMANCE TESTS
22 - 5.5.1 Leakage from air ports
22 - 5.5.2 Resistance to bending
22 - 5.5.3 Ability to resist and relieve back pressure
22 - 5.5.4 Back pressure
22 - 5.5.5 Back siphonage
22 - 5.5.6 Rated flow
22 - 5.5.7 Ability to withstand continuous pressure
22 - 5.5.8 Endurance
23 - SECTION 6 DUAL CHECK VALVES WITH ATMOSPHERIC PORT (DCAP)
23 - 6.1 GENERAL
23 - 6.2 APPLICATION
23 - 6.3 COMPONENTS
23 - 6.3.1 Ventilation valve
23 - 6.3.2 Non-return valves
23 - 6.4 SPECIFIC DESIGN REQUIREMENTS
23 - 6.4.1 Airflow passage, cross-sectional area
23 - 6.4.2 Airport outlet
24 - 6.5 PERFORMANCE TESTS
24 - 6.5.1 Non-return valve closing pressure
24 - 6.5.2 Leakage from air ports
24 - 6.5.3 Backflow through upstream non-return valve
24 - 6.5.4 Ventilation valve opening pressure
24 - 6.5.5 Back siphonage
24 - 6.5.6 Back siphonage under back pressure
24 - 6.5.7 Rated water-flow capacity and pressure loss
24 - 6.5.8 Flow with low supply pressure
24 - 6.5.9 Ability to withstand continuous pressure
24 - 6.5.10 Endurance
25 - SECTION 7 DUAL CHECK VALVES (DUAL CV)
25 - 7.1 GENERAL
25 - 7.2 APPLICATION
25 - 7.3 COMPONENTS
25 - 7.4 PERFORMANCE TESTS
25 - 7.4.1 Non-return valve closing pressure
25 - 7.4.2 Rated water-flow capacity and pressure loss
25 - 7.4.3 Endurance
27 - SECTION 8 DUAL CHECK VALVE WITH INTERMEDIATE VENT (Du CV)
27 - 8.1 GENERAL
27 - 8.2 APPLICATION
27 - 8.3 COMPONENTS
27 - 8.3.1 Ventilation valve
27 - 8.3.2 Non-return valves
27 - 8.4 SPECIFIC DESIGN REQUIREMENTS
27 - 8.4.1 Air port locations
27 - 8.4.2 Air ports opening area
28 - 8.5 PERFORMANCE TESTS
28 - 8.5.1 Non-return
28 - 8.5.2 Minimum flow capacity
28 - 8.5.3 Intermediate vent valve leakage
28 - 8.5.4 Back siphonage
28 - 8.5.5 Endurance
29 - SECTION 9 PRESSURE TYPE VACUUM BREAKERS (PVB)
29 - 9.1 GENERAL
29 - 9.2 APPLICATION
29 - 9.3 COMPONENTS
29 - 9.3.1 Ventilation valve
29 - 9.3.2 Non-return valves
29 - 9.3.3 Test taps
30 - 9.4 SPECIFIC DESIGN REQUIREMENTS
30 - 9.4.1 Air port shields
30 - 9.4.2 Test taps
30 - 9.4.3 Critical level mark
30 - 9.5 PERFORMANCE TESTS
30 - 9.5.1 Non-return valve closing pressure
30 - 9.5.2 Ventilation valve opening pressure
31 - 9.5.3 Air port opening area
31 - 9.5.4 Water rise
31 - 9.5.5 Rated flow
31 - 9.5.6 Endurance
31 - 9.5.7 Critical level
32 - SECTION 10 DOUBLE CHECK VALVES (DCV)
32 - 10.1 GENERAL
32 - 10.2 APPLICATION
32 - 10.3 COMPONENTS
32 - 10.3.1 Non-return valves
32 - 10.3.2 Test taps
32 - 10.4 SPECIFIC DESIGN REQUIREMENTS
32 - 10.5 PERFORMANCE TESTS
32 - 10.5.1 Non-return valve closing pressure
32 - 10.5.2 Rated flow
33 - 10.5.3 Endurance
34 - SECTION 11 DOUBLE CHECK DETECTOR ASSEMBLY (DCDA)
34 - 11.1 GENERAL
34 - 11.2 APPLICATION
34 - 11.3 COMPONENTS
34 - 11.3.1 Main double check valve
34 - 11.3.2 Bypass line
34 - 11.3.3 Water meter
34 - 11.3.4 Secondary double check valve
34 - 11.4 PERFORMANCE TEST
36 - SECTION 12 REDUCED PRESSURE ZONE DEVICES (RPZD)
36 - 12.1 GENERAL
36 - 12.2 APPLICATION
36 - 12.3 COMPONENTS
36 - 12.3.1 Non-return valves
36 - 12.3.2 Relief valve
36 - 12.3.3 Test taps
36 - 12.4 SPECIFIC DESIGN REQUIREMENTS
36 - 12.4.1 Relief valve diaphragm or equivalent
37 - 12.4.2 Test taps
37 - 12.4.3 Relief valve opening
37 - 12.5 PERFORMANCE TESTS
37 - 12.5.1 Downstream non-return valve closing pressure
37 - 12.5.2 Intermediate chamber pressure
37 - 12.5.3 Supply pressure at which the intermediate chamber becomes atmospheric
38 - 12.5.4 Intermediate chamber pressure under back pressure conditions when the supply pressure is 14 kPa or greater
38 - 12.5.5 Intermediate chamber pressure under back pressure conditions, when the supply pressure is less than 14 kPa
38 - 12.5.6 Pressure differential at which relief valve commences to open
38 - 12.5.7 Supply pressure fluctuations and discharge from relief valve
38 - 12.5.8 Rated flow
38 - 12.5.9 Back siphonage
39 - 12.5.10 Back pressure
39 - 12.5.11 Endurance
40 - SECTION 13 REDUCED PRESSURE DETECTOR ASSEMBLY (RPDA)
40 - 13.1 GENERAL
40 - 13.2 APPLICATION
40 - 13.3 COMPONENTS
40 - 13.3.1 Main reduced pressure zone device
40 - 13.3.2 Bypass line
40 - 13.3.3 Water meter
40 - 13.3.4 Secondary reduced pressure zone device
40 - 13.4 PERFORMANCE TEST
42 - SECTION 14 VACUUM BREAKER CHECK VALVE (VBCV)
42 - 14.1 GENERAL
42 - 14.2 APPLICATION
42 - 14.3 COMPONENTS
42 - 14.3.1 Ventilation valve
42 - 14.3.2 Non-return valve
42 - 14.4 SPECIFIC DESIGN REQUIREMENTS
42 - 14.4.1 General
42 - 14.4.2 Air ports opening area
43 - 14.4.3 Air port shields
43 - 14.4.4 End connection
43 - 14.5 PERFORMANCE TESTS
43 - 14.5.1 Strength of tap head to valve body operating mechanism
43 - 14.5.2 Strength of valve to tap body
43 - 14.5.3 Watertightness
43 - 14.5.4 Leakage from air ports
43 - 14.5.5 Ability to resist and relieve back pressure
43 - 14.5.6 Back pressure
43 - 14.5.7 Back siphonage
43 - 14.5.8 Rated flow
44 - 14.5.9 Non-return valve closing pressure
44 - 14.5.10 Ventilation valve opening pressure
44 - 14.5.11 Air port opening area
44 - 14.5.12 Supply pressure fluctuations
44 - 14.5.13 Endurance
44 - 14.5.14 Endurance (tap operation)
44 - 14.5.15 Ability to resist stiction or adhesion between the ventilation valve sealing elements
45 - SECTION 15 ANTI-SPILL PRESSURE VACUUM BREAKER (APVB)
45 - 15.1 GENERAL
45 - 15.2 APPLICATION
45 - 15.3 COMPONENTS
45 - 15.3.1 Ventilation valve
45 - 15.3.2 Air port entry seal
45 - 15.3.3 Non-return valve
46 - 15.3.4 Test points
46 - 15.4 SPECIFIC DESIGN REQUIREMENTS
46 - 15.4.1 Air port shields
46 - 15.4.2 Test points
46 - 15.5 PERFORMANCE TESTS
46 - 15.5.1 Non-return valve closing pressure
46 - 15.5.2 Ventilation valve opening pressure
46 - 15.5.3 Air port entry seal
46 - 15.5.4 Air port opening area
46 - 15.5.5 Water rise
46 - 15.5.6 Rated flow
47 - 15.5.7 Endurance
47 - 15.5.8 Critical level
48 - SECTION 16 BEVERAGE DISPENSER DUAL CHECK VALVE WITH ATMOSPHERIC PORT (BDDC)
48 - 16.1 GENERAL
48 - 16.2 APPLICATION
48 - 16.3 COMPONENTS
48 - 16.3.1 Ventilation valve
48 - 16.3.2 Non-return valves
48 - 16.3.3 Air port
48 - 16.4 SPECIFIC DESIGN REQUIREMENTS
48 - 16.4.1 Air port
48 - 16.4.2 Shields
49 - 16.4.3 Air port opening area
49 - 16.4.4 Strainers
49 - 16.5 PERFORMANCE TESTS
49 - 16.5.1 Non-return closing pressure
49 - 16.5.2 Air port leakage
49 - 16.5.3 Backflow through upstream non-return valve
49 - 16.5.4 Ventilation valve opening pressure
49 - 16.5.5 Back siphonage under back pressure
49 - 16.5.6 Rated flow
49 - 16.5.7 Ability to withstand continuous pressure
49 - 16.5.8 Endurance
50 - SECTION 17 INSTALLATION INSTRUCTIONS AND MARKING
50 - 17.1 INSTALLATION INSTRUCTIONS
50 - 17.2 MAINTENANCE INSTRUCTIONS
50 - 17.3 MARKING REQUIREMENTS
50 - 17.4 ADDITIONAL MARKING
51 - APPENDIX A - REFERENCED DOCUMENTS
53 - APPENDIX B - INSTRUMENTATION REQUIREMENTS
53 - B1 GENERAL
53 - B2 FLOW METER (for use with air)
53 - B3 FLOW METER (for use with water)
53 - B4 PRESSURE GAUGES
53 - B5 TEMPERATURE-INDICATING DEVICE
53 - B6 STOPWATCH
53 - B7 SIGHT GLASS
54 - APPENDIX C - TORQUE TEST ON SCREWED END VALVES
54 - C1 SCOPE
54 - C2 TEMPERATURE OF MEASUREMENT
54 - C3 APPARATUS
54 - C4 PROCEDURE
54 - C5 TEST REPORT
55 - APPENDIX D - TEST FOR ABILITY TO WITHSTAND CONTINUOUS PRESSURE - DEVICES INTENDED FOR HOT WATER APPLICATION
55 - D1 SCOPE
55 - D2 TEMPERATURE OF MEASUREMENT
55 - D3 APPARATUS
55 - D4 PROCEDURE
55 - D5 TEST REPORT
56 - APPENDIX E - POSITIVE PRESSURE TEST
56 - E1 SCOPE
56 - E2 TEMPERATURE OF MEASUREMENT
56 - E3 APPARATUS
56 - E4 PROCEDURE
56 - E5 TEST REPORT
57 - APPENDIX F - REVERSE PRESSURE TEST
57 - F1 SCOPE
57 - F2 TEMPERATURE OF MEASUREMENT
57 - F3 APPARATUS
57 - F4 PROCEDURE
57 - F5 TEST REPORT
58 - APPENDIX G - AIRPORT OPENING AREA TEST - ATMOSPHERIC VACUUM BREAKERS, VACUUM BREAKER CHECK VALVES AND PRESSURE TYPE VACUUM
58 - G1 SCOPE
58 - G2 TEMPERATURE OF MEASUREMENT
58 - G3 APPARATUS
58 - G4 PROCEDURE
58 - G5 TEST REPORT
60 - APPENDIX H - WATER RISE TEST - ATMOSPHERIC VACUUM BREAKERS, PRESSURE TYPE VACUUM BREAKERS AND ANTI-SPILL PRESSURE VACUUM BREAKER
60 - H1 SCOPE
60 - H2 TEMPERATURE OF MEASUREMENTS
60 - H3 APPARATUS
60 - H4 PROCEDURE
60 - H5 TEST REPORT
62 - APPENDIX I - FOULING WIRE SIZES
64 - APPENDIX J - ENDURANCE TEST - ATMOSPHERIC VACUUM BREAKERS
64 - J1 SCOPE
64 - J2 TEMPERATURE OF MEASUREMENT
64 - J3 APPARATUS
64 - J4 PROCEDURE
64 - J5 TEST REPORT
65 - APPENDIX K - TEST FOR RATED FLOW AND PRESSURE LOSS
65 - K1 SCOPE
65 - K2 TEMPERATURE OF MEASUREMENT
65 - K3 APPARATUS
65 - K4 PROCEDURE
65 - K5 TEST REPORT
66 - APPENDIX L - VENTILATION VALVE LEAKAGE TEST - ATMOSPHERIC VACUUM BREAKERS
66 - L1 SCOPE
66 - L2 TEMPERATURE OF MEASUREMENT
66 - L3 APPARATUS
66 - L4 PROCEDURE
66 - L5 TEST REPORT
67 - APPENDIX M - DETERMINATION OF CRITICAL LEVEL ATMOSPHERIC VACUUM BREAKERS, PRESSURE TYPE VACUUM BREAKERS AND ANTI-SPILL PRESSURE
67 - M1 SCOPE
67 - M2 TEMPERATURE OF MEASUREMENT
67 - M3 APPARATUS
67 - M4 PROCEDURE
68 - M5 REPORT
69 - APPENDIX N - TEST FOR LEAKAGE FROM AIRPORTS HOSE CONNECTION VACUUM BREAKERS AND DUAL CHECK VALVES WITH INTERMEDIATE VENTS
69 - N1 SCOPE
69 - N2 TEMPERATURE OF MEASUREMENT
69 - N3 APPARATUS
69 - N4 PROCEDURE
69 - N5 TEST REPORT
70 - APPENDIX O - TEST FOR RESISTANCE TO BENDING - HOSE CONNECTION VACUUM BREAKERS
70 - O1 SCOPE
70 - O2 TEMPERATURE OF MEASUREMENT
70 - O3 APPARATUS
70 - O4 PROCEDURE
70 - O5 TEST REPORT
71 - APPENDIX P - TEST FOR RESISTANCE AND RELIEF OF BACK PRESSURE - HOSE CONNECTION VACUUM BREAKERS
71 - P1 SCOPE
71 - P2 TEMPERATURE OF MEASUREMENT
71 - P3 APPARATUS
71 - P4 PROCEDURE
71 - P5 TEST REPORT
72 - APPENDIX Q - BACK PRESSURE TEST - HOSE CONNECTION VACUUM BREAKERS AND VACUUM BREAKER CHECK VALVES
72 - Q1 SCOPE
72 - Q2 TEMPERATURE OF MEASUREMENT
72 - Q3 APPARATUS
72 - Q4 PROCEDURE
72 - Q5 TEST REPORT
73 - APPENDIX R - TEST FOR BACK SIPHONAGE - HOSE CONNECTION VACUUM BREAKERS, AND DUAL CHECK VALVES WITH ATMOSPHERIC PORT AND VACUUM
73 - R1 SCOPE
73 - R2 TEMPERATURE OF MEASUREMENT
73 - R3 APPARATUS
73 - R4 PROCEDURE
73 - R5 TEST REPORT
74 - APPENDIX S - TEST FOR RATED WATER FLOW CAPACITY AND PRESSURE LOSS - HOSE CONNECTION VACUUM BREAKERS
74 - S1 SCOPE
74 - S2 TEMPERATURE OF MEASUREMENT
74 - S3 APPARATUS
74 - S4 PROCEDURE
74 - S5 TEST REPORT
75 - APPENDIX T - ENDURANCE TEST - HOSE CONNECTION VACUUM BREAKERS
75 - T1 SCOPE
75 - T2 TEMPERATURE OF MEASUREMENT
75 - T3 APPARATUS
75 - T4 PROCEDURE
75 - T5 TEST REPORT
76 - APPENDIX U - NON-RETURN VALVE CLOSING PRESSURE TEST
76 - U1 SCOPE
76 - U2 TEMPERATURE OF MEASUREMENT
76 - U3 APPARATUS
76 - U4 PROCEDURE
77 - U5 TEST REPORT
78 - APPENDIX V - TEST FOR LEAKAGE FROM AIRPORTS - DUAL CHECK VALVES WITH ATMOSPHERIC PORT AND BEVERAGE DISPENSER DUAL CHECK VALVES
78 - V1 SCOPE
78 - V2 TEMPERATURE OF MEASUREMENT
78 - V3 APPARATUS
78 - V4 PROCEDURE
78 - V5 TEST REPORT
79 - APPENDIX W - TEST FOR BACKFLOW THROUGH UPSTREAM NON-RETURN VALVE - DUAL CHECK VALVES WITH ATMOSPHERIC PORT AND BEVERAGE DISPENSE
79 - W1 SCOPE
79 - W2 TEMPERATURE OF MEASUREMENT
79 - W3 APPARATUS
79 - W4 PROCEDURE
79 - W5 TEST REPORT
81 - APPENDIX X - VENTILATION VALVE OPENING PRESSURE TEST - DUAL CHECK VALVES WITH ATMOSPHERIC PORT AND BEVERAGE DISPENSER DUAL CHECK
81 - X1 SCOPE
81 - X2 TEMPERATURE OF MEASUREMENT
81 - X3 APPARATUS
81 - X4 PROCEDURE
81 - X5 TEST REPORT
82 - APPENDIX Y - TEST FOR BACK SIPHONAGE UNDER BACK PRESSURE - DUAL CHECK VALVES WITH ATMOSPHERIC PORT
82 - Y1 SCOPE
82 - Y2 TEMPERATURE OF MEASUREMENT
82 - Y3 APPARATUS
82 - Y4 PROCEDURE
82 - Y5 TEST REPORT
83 - APPENDIX Z - TESTING INSTALLATION FOR TESTS IN APPENDICES E, K, M, L, S AND AA
84 - APPENDIX AA - TEST FOR FLOW RATE AT LOW SUPPLY PRESSURE - DUAL CHECK VALVES WITH ATMOSPHERIC PORT
84 - AA1 SCOPE
84 - AA2 TEMPERATURE OF MEASUREMENT
84 - AA3 APPARATUS
84 - AA4 PROCEDURE
84 - AA5 TEST REPORT
85 - APPENDIX AB - ENDURANCE TEST - DUAL CHECK VALVES WITH ATMOSPHERIC PORT
85 - AB1 SCOPE
85 - AB2 TEMPERATURE OF MEASUREMENT
85 - AB3 APPARATUS
85 - AB4 PROCEDURES
85 - AB5 TEST REPORT
86 - APPENDIX AC - ENDURANCE TEST - DOUBLE CHECK VALVE, DUAL CHECK VALVE, DUAL CHECK VALVE WITH INTERMEDIATE VENT AND BEVERAGE
86 - AC1 SCOPE
86 - AC2 TEMPERATURE OF MEASUREMENT
86 - AC3 APPARATUS
86 - AC4 PROCEDURE
86 - AC5 REPORT
87 - APPENDIX AD - BACK SIPHONAGE TEST - DUAL CHECK VALVES WITH INTERMEDIATE VENT
87 - AD1 SCOPE
87 - AD2 TEMPERATURE OF MEASUREMENT
87 - AD3 APPARATUS
87 - AD4 PROCEDURE
87 - AD5 TEST REPORT
89 - APPENDIX AE - VENTILATION VALVE OPENING PRESSURE TEST PRESSURE TYPE VACUUM BREAKERS, VACUUM BREAKER CHECK VALVES AND ANTI-SPILL
89 - AE1 SCOPE
89 - AE2 TEMPERATURE OF MEASUREMENT
89 - AE3 APPARATUS
89 - AE4 PROCEDURE
89 - AE4.1 Pressure type vacuum breakers and anti-spill pressure vacuum breakers
89 - AE4.2 Vacuum breaker check valves
90 - AE5 TEST REPORT
91 - APPENDIX AF - ENDURANCE TEST - PRESSURE TYPE VACUUM BREAKERS
91 - AF1 SCOPE
91 - AF2 TEMPERATURE OF MEASUREMENT
91 - AF3 APPARATUS
91 - AF4 PROCEDURE
91 - AF5 REPORT
92 - APPENDIX AG - INTERMEDIATE CHAMBER PRESSURE TEST - REDUCED PRESSURE ZONE DEVICES
92 - AG1 SCOPE
92 - AG2 TEMPERATURE OF MEASUREMENT
92 - AG3 APPARATUS
92 - AG4 PROCEDURE
92 - AG5 TEST REPORT
93 - APPENDIX AH - DETERMINATION OF SUPPLY PRESSURE AT WHICH PRESSURE IN THE INTERMEDIATE CHAMBER BECOMES ATMOSPHERIC - REDUCED
93 - AH1 SCOPE
93 - AH2 TEMPERATURE OF MEASUREMENT
93 - AH3 APPARATUS
93 - AH4 PROCEDURE
93 - AH5 TEST REPORT
95 - APPENDIX AI - DETERMINATION OF INTERMEDIATE CHAMBER PRESSURE UNDER BACK PRESSURE CONDITIONS WHEN THE SUPPLY PRESSURE IS 14kPa OR
95 - AI1 SCOPE
95 - AI2 TEMPERATURE OF MEASUREMENT
95 - AI3 APPARATUS
95 - AI4 PROCEDURE
95 - AI5 TEST REPORT
97 - APPENDIX AJ - DETERMINATION OF INTERMEDIATE CHAMBER PRESSURE UNDER BACKPRESSURE CONDITIONS WHEN THE SUPPLY PRESSURE IS LESS THAN
97 - AJ1 SCOPE
97 - AJ2 TEMPERATURE OF MEASUREMENT
97 - AJ3 APPARATUS
97 - AJ4 PROCEDURE
97 - AJ5 TEST REPORT
99 - APPENDIX AK -DETERMINATION OF PRESSURE DIFFERENTIAL AT WHICH RELIEF VALVE COMMENCES TO OPEN - REDUCED PRESSURE ZONE DEVICES
99 - AK1 SCOPE
99 - AK2 TEMPERATURE OF MEASUREMENT
99 - AK3 APPARATUS
99 - AK4 PROCEDURE
99 - AK5 TEST REPORT
101 - APPENDIX AL -TEST FOR EFFECT OF SUPPLY PRESSURE FLUCTUATION ON DISCHARGE FROM RELIEF VALVE - REDUCED PRESSURE ZONE DEVICES
101 - AL1 SCOPE
101 - AL2 TEMPERATURE OF MEASUREMENT
101 - AL3 APPARATUS
101 - AL4 PROCEDURE
101 - AL5 TEST REPORT
102 - APPENDIX AM - BACK SIPHONAGE TEST - REDUCED PRESSURE ZONE DEVICES
102 - AM1 SCOPE
102 - AM2 TEMPERATURE OF MEASUREMENT
102 - AM3 APPARATUS
102 - AM4 PROCEDURE
102 - AM5 TEST REPORT
104 - APPENDIX AN - BACK PRESSURE TEST - REDUCED PRESSURE ZONE DEVICES
104 - AN1 SCOPE
104 - AN2 TEMPERATURE OF MEASUREMENT
104 - AN3 APPARATUS
104 - AN4 PROCEDURE
105 - AN5 TEST REPORT
106 - APPENDIX AO - ENDURANCE TEST - REDUCED PRESSURE ZONE DEVICES
106 - AO1 SCOPE
106 - AO2 TEMPERATURE OF MEASUREMENT
106 - AO3 APPARATUS
106 - AO4 PROCEDURE
106 - AO5 TEST REPORT
107 - APPENDIX AP - ENDURANCE TEST - VACUUM BREAKER CHECK VALVE
107 - API SCOPE
107 - AP2 TEMPERATURE OF MEASUREMENT
107 - AP3 APPARATUS
107 - AP4 PROCEDURE
107 - AP5 REPORT
108 - APPENDIX AQ - ADHESION TEST - RESILIENT SEAT MATERIAL
108 - AQ1 SCOPE
108 - AQ2 TEMPERATURE OF MEASUREMENT
108 - AQ3 PRINCIPLE
108 - AQ4 APPLICATION
108 - AQ5 APPARATUS
109 - AQ6 PROCEDURE
109 - AQ7 TEST REPORT
110 - APPENDIX AR - AIR PORT ENTRY SEALING TEST ANTI-SPILL PRESSURE VACUUM BREAKERS
110 - AR1 SCOPE
110 - AR2 TEMPERATURE OF MEASUREMENT
110 - AR3 APPARATUS
110 - AR4 PROCEDURE
110 - AR5 REPORT
112 - APPENDIX AS - BACK SIPHONAGE TEST - BEVERAGE DISPENSER DUAL CHECK VALVE WITH ATMOSPHERIC PORT (BDDC)
112 - AS1 SCOPE
112 - AS2 TEMPERATURE OF MEASUREMENT
112 - AS3 PRINCIPLE
112 - AS4 APPARATUS
112 - AS5 PROCEDURE
112 - AS6 REPORT
114 - APPENDIX AT - ENDURANCE TEST - BEVERAGE DISPENSER DUAL CHECK VALVES WITH ATMOSPHERIC PORT
114 - AT1 SCOPE
114 - AT2 TEMPERATURE OF MEASUREMENT
114 - AT3 APPARATUS
114 - AT4 PROCEDURE
114 - AT5 REPORT
115 - APPENDIX AU - MISCELLANEOUS GUIDELINES
115 - AU1 PURPOSE OF BACKFLOW PREVENTION DEVICES
115 - AU2 SAFETY PERFORMANCE STANDARD
115 - AU3 STRUCTURAL STRENGTH OF BACKFLOW PREVENTION DEVICES
115 - AU4 FACTORS WHICH PROMOTE POTENTIAL REVERSAL OF WATER FLOW
115 - AU5 DEVICES DESIGNED FOR PROTECTION AGAINST BACK SIPHONAGE ONLY
115 - AU6 NON-RETURN VALVES
116 - AU7 DEVICES DESIGNED FOR PROTECTION AGAINST BOTH BACK SIPHONAGE AND BACK PRESSURE
116 - AU8 SELECTION AND PERMITTED USE OF BACKFLOW PREVENTION DEVICES
116 - AU9 AUTHORIZATION
116 - AU10 RATED FLOWS AND PRESSURE LOSSES OF BACKFLOW PREVENTION DEVICES
116 - AU11 OPENING AND CLOSING SPRINGS ON RELIEF AND NON-RETURN VALVES
116 - AU12 ENDURANCE TESTS

Specifies requirements for the materials, design and performance testing of backflow devices used to prevent contamination of potable water supplies.

Committee	WS-023
DocumentType	Standard
ISBN	0 7337 1792 6
Pages	107
PublisherName	Standards Australia
Status	Superseded
SupersededBy	AS/NZS 2845.1:2010
Supersedes	AS 2845.1-1995 DR 96011
UnderRevision	DR 07208 DR 10003 CP DR 07283 DR 07284 DR 07285 DR 07288 DR 07287 DR 07286 DR 07282 DR 07203 DR 07202 DR 07204 DR 07206 DR 07205 DR 07207

This Standard specifies requirements for the design, performance and testing of backflow prevention devices, used for the protection of potable water. Illustrations used in this Standard are diagrammatic only and have been chosen without prejudice.The Standard covers the following types of backflow prevention devices:(a) Atmospheric vacuum breakers (AVB).(b) Hose connection vacuum breakers (HCVB).(c) Dual check valves with atmospheric port (DCAP).(d) Dual check valves (Dual CV).(e) Dual check valve with intermediate vent (Du CV).(f) Pressure type vacuum breakers (PVB).(g) Double check valves (DCV).(h) Double check detector assembly (DCDA).(i) Reduced pressure zone devices (RPZD).(j) Reduced pressure detector assembly (RPDA).(k) Vacuum breaker check valves (VBCV).(l) Anti-spill pressure vacuum breaker (APVB).(m) Beverage dispenser dual check valves with atmospheric port (BDDC).NOTE: Unless otherwise specified, the nominal size of a device is determined by the inlet connection.

First published as AS 2845-1986.
Revised and redesignated AS 2845.1-1991.
Second edition 1995.
Jointly revised and redesignated AS/NZS 2845.1:1998.

AS/NZS 3499:2006	Water supply - Flexible hose assemblies (Reconfirmed 2016)
AS/NZS 3718:2005	Water supply - Tap ware (Reconfirmed 2016)
AS 4087-1996	Metallic flanges for waterworks purposes
AS 3855-1994	Suitability of plumbing and water distribution systems products for contact with potable water
AS 2845.3-1993	Water supply - Backflow prevention devices Field testing and maintenance
AS/NZS 4331.3:1995	Metallic flanges Copper alloy and composite flanges (Reconfirmed 2020)
AS 1447-2007	Hot-rolled spring steels (Reconfirmed 2017)
AS/NZS 4158:2003	Thermal-bonded polymeric coatings on valves and fittings for water industry purposes (Reconfirmed 2015)
AS/NZS 3500.0:1995	National Plumbing and Drainage Code Glossary of terms
AS 2129-2000	Flanges for pipes, valves and fittings (Reconfirmed 2016)
AS 1472-1991	Carbon steel spring wire for mechanical springs
AS 2345-1992	Dezincification resistance of copper alloys
AS 2074-2003	Cast steels
AS 1769-1975	Welded stainless steel tubes for plumbing applications (Reconfirmed 2018)
AS 3688-2005	Water supply - Metallic fittings and end connectors
AS 1874-1988	Aluminium and aluminium alloys - Ingots and castings
AS/NZS 3718:1997	Water supply - Metal-bodied taps - Specified by performance
AS 4087-2004	Metallic flanges for waterworks purposes
AS 3565.1-2004	Meters for water supply Cold water meters
AS 1349-1986	Bourdon tube pressure and vacuum gauges (Reconfirmed 2018)
AS 2074-1982	Steel castings
AS 1447-1991	Hot-rolled spring steels
AS 1874-2000	Aluminium and aluminium alloys - Ingots and castings (Reconfirmed 2018)
AS 1834.1-1991	Material for soldering Solder alloys (Reconfirmed 2018)
AS 2129-1994	Flanges for pipes, valves and fittings
AS 2345-2006	Dezincification resistance of copper alloys
AS 1718-1992	Water supply - Copper alloy screw-down pattern taps - Specified by dimensions
AS/NZS 3499:1997	Flexible tube connectors for water supply
AS 1472-2003	Carbon steel spring wire for mechanical springs
AS/NZS 4158:1996	Thermal-bonded polymeric coatings on valves and fittings for water industry purposes
AS/NZS 1167.1:2005	Welding and brazing - Filler metals Filler metal for brazing and braze welding
AS/NZS 3500.0:2003	Plumbing and drainage Glossary of terms
AS 1722.1-1975	Pipe threads of Whitworth form Sealing pipe threads (metric units)
AS 2837-1986	Wrought alloy steels - Stainless steel bars and semi-finished products
AS 1722.2-1992	Pipe threads of Whitworth form Fastening pipe threads (Reconfirmed 2017)
AS/NZS 4331.1:1995	Metallic flanges Steel flanges (Reconfirmed 2020)
AS 3688-1994	Water supply - Copper and copper alloy body compression and capillary fittings and threaded-end connectors
AS 1167.1-1993	Welding and brazing - Filler metals Filler metal for brazing and braze welding
AS 2738.2-1984	Copper and copper alloys - Compositions and designations - Wrought products
AS 3565.1-1998	Meters for cold potable water - Volumetric chamber and turbine meters
AS 3558.5-1999	Methods of testing plastics and composite materials sanitary plumbing fixtures Determination of degradation by ultraviolet light (Reconfirmed 2016)

AS 3565.5-2004	Meters for water supply - Water meters with two integral single check valves
AS 5200.000-2006	Technical specification for plumbing and drainage products Procedures for certification of plumbing and drainage products (Reconfirmed 2018)
ATS 5200.004-2005	Technical Specification for plumbing and drainage products Urinal flushing cisterns
ATS 5200.051-2005	Technical Specification for plumbing and drainage products Bidet douche seats
AS 3496-1999	Metal-bodied and plastic-bodied taps
AS 2845.3-2010	Water supply - Backflow prevention devices Field testing and maintenance of testable devices
AS/NZS 3500.1.2:1998	National plumbing and drainage Water supply - Acceptable solutions
AS 5047-2005	Hydraulic shoring and trench lining equipment
ATS 5200.104-2005	Appliances (miscellaneous)
MP 52-2005	Manual of authorization procedures for plumbing and drainage products
AS 3565.3-1998	Meters for cold potable water - Water meters with integral dual check valves
ATS 5200.420-2005	Technical Specification for plumbing and drainage products Trap-priming valves
ATS 5200.477-2006	Technical Specification for plumbing and drainage products Rainwater/mains supply changeover devices
ATS 5200.103-2004	Technical Specification for plumbing and drainage products - Water treatment systems (other than those specified in AS/NZS 3497)
AS 2845.2-1996	Water supply - Backflow prevention devices Air gaps and break tanks
ATS 5200.101-2005	Appliances (low hazard rating)
AS 5200.000-2005	Technical specification for plumbing and drainage products Procedures for certification of plumbing and drainage products
AS 2845.2-2010	Water supply - Backflow preventions devices Registered air gaps and registered break tanks
AS/NZS 3718:2005	Water supply - Tap ware (Reconfirmed 2016)
ATS 5200.466-2004	Technical Specification for plumbing and drainage products - Rainwater tank connection devices
AS 1172.2-1999	Water closet (WC) pans of 6/3 L capacity or proven equivalent Cisterns
AS/NZS 3500.5:2000	Plumbing and Drainage Domestic installations
ATS 5200.105-2005
AS/NZS 4233.2:1999	High pressure water (hydro) jetting systems Construction and performance
AS/NZS 3497:1998	Drinking water treatment units - Plumbing requirements
AS 2845.3-1993	Water supply - Backflow prevention devices Field testing and maintenance
MP 52-2001	Manual of authorization procedures for plumbing and drainage products
AS 3565.3-2004	Meters for water supply - Water meters with integral dual check valves
AS/NZS 3500.1:2003	Plumbing and drainage Water services
AS 2419.1-2005	Fire hydrant installations System design, installation and commissioning

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AS/NZS 2845.1:1998

Water supply - Backflow prevention devices Materials, design and performance requirements

Table of Contents

Abstract

General Product Information

Scope

History

Standards Referenced By This Book

Standards Referencing This Book

Category

Subcategory