Standard
UPDATE AVAILABLE
AS/NZS 2845.1:2010
[Superseded]Water supply — Backflow prevention devices, Part 1: Materials, design and performance requirements
This Standard specifies requirements for the materials, design, performance and testing of mechanical backflow prevention devices that are used for the protection of water supplies.
Published: 30/06/2010
Pages: 150
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
1 Scope and general
1.1 Scope
1.2 Application
1.3 Normative references
1.4 Definitions
1.5 Testing apparatus, testing sequence and instrumentation
1.6 Designation of size
1.7 Classification
1.8 Allowable pressures and flow velocities
2 Materials
2.1 General
2.2 Stainless steel
2.3 Filler metals
2.4 Nickel-copper-iron
2.5 Ferrous materials
2.5.1 General
2.5.2 Coating design
2.6 Copper
2.7 Copper alloys
2.8 Aluminium alloys
2.9 Corrosion-resistant metallic materials
2.10 Elastomeric materials
2.11 Plastics
2.11.1 General
2.11.2 Plastics-bodied devices
2.11.3 Acetal
3 Common design and performance requirements
3.1 General
3.2 Effect on water
3.3 Pressure and temperature ranges
3.4 Design
3.4.1 Serviceability
3.4.2 Release of trapped air
3.4.3 Flexible valve seats and diaphragms
3.5 End connections
3.5.1 General
3.5.2 Hose connections
3.5.3 Test tap outlets
3.5.4 Water meter connection ends
3.6 Valve seatings
3.7 Structural tests
3.7.1 General
3.7.2 Torque
3.7.3 Heated water
3.7.4 Positive pressure
3.7.5 Reverse pressure
3.7.6 Endurance
3.7.7 Non-testable devices (low hazard)
3.8 Sampling and frequency plans
4 Atmospheric vacuum breaker (AVB)
4.1 General
4.2 Application
4.3 Components
4.3.1 Ventilation valve
4.3.2 Non-return valve
4.4 Specific design requirements
4.4.1 Air port shields
4.4.2 Critical level (CL) mark
4.5 Performance tests
4.5.1 Procedures
4.5.2 Air port opening area
4.5.3 Water rise
4.5.4 Rated flow and pressure loss
4.5.5 Ventilation valve leakage
4.5.6 Critical level
4.5.7 Endurance
4.5.8 Ability to resist adhesion between the ventilation valve sealing elements
4.6 Sampling and frequency plans
5 Hose connection vacuum breaker (HCVB)
5.1 General
5.2 Application
5.3 Components
5.3.1 Ventilation valve
5.3.2 Non-return valve
5.4 Specific design requirements
5.4.1 Air ports locations
5.4.2 Air ports opening area
5.4.3 Security
5.5 Performance tests
5.5.1 Procedures
5.5.2 Leakage from air ports
5.5.3 Resistance to bending
5.5.4 Ability to resist and relieve backpressure
5.5.5 Backpressure
5.5.6 Back-siphonage
5.5.7 Rated flow and pressure loss
5.5.8 Endurance
5.6 Sampling and frequency plans
6 Dual check valve with atmospheric port (DCAP)
6.1 General
6.2 Application
6.3 Components
6.3.1 Ventilation valve
6.3.2 Non-return valves
6.4 Specific design requirements
6.4.1 Airflow passage, cross-sectional area
6.4.2 Air port outlet
6.5 Performance tests
6.5.1 Procedures
6.5.2 Non-return valve closing pressure
6.5.3 Leakage from air ports
6.5.4 Backflow through upstream non-return valve
6.5.5 Ventilation valve opening pressure
6.5.6 Back-siphonage
6.5.7 Back-siphonage under backpressure
6.5.8 Rated flow and pressure loss
6.5.9 Flow with low supply pressure
6.5.10 Endurance
6.6 Sampling and frequency plans
7 Dual check valve (Dual CV)
7.1 General
7.2 Application
7.3 Components
7.4 Performance tests
7.4.1 Procedures
7.4.2 Non-return valve closing pressure
7.4.3 Rated flow and pressure loss
7.4.4 Endurance
7.5 Sampling and frequency plans
8 Dual check valve with intermediate vent (Du CV)
8.1 General
8.2 Application
8.3 Components
8.3.1 Ventilation valve
8.3.2 Non-return valves
8.4 Specific design requirements
8.4.1 Air port locations
8.4.2 Air ports opening area
8.5 Performance tests
8.5.1 Procedures
8.5.2 Non-return valve closing pressure
8.5.3 Minimum flow capacity and pressure loss
8.5.4 Intermediate vent device leakage
8.5.5 Back-siphonage
8.5.6 Endurance
8.6 Sampling and frequency plans
9 Pressure type vacuum breaker (PVB)
9.1 General
9.2 Application
9.3 Components
9.3.1 Ventilation valve
9.3.2 Non-return valve
9.3.3 Test taps
9.4 Specific design requirements
9.4.1 Air port shields
9.4.2 Test taps
9.4.3 Critical level mark
9.5 Performance tests
9.5.1 Procedures
9.5.2 Non-return valve closing pressure
9.5.3 Ventilation valve opening pressure
9.5.4 Air port opening area
9.5.5 Water rise
9.5.6 Rated flow
9.5.7 Critical level
9.5.8 Endurance
9.5.9 Ability to resist adhesion between the ventilation valve sealing elements
9.6 Sampling and frequency plans
10 Double check valve (DCV)
10.1 General
10.2 Application
10.3 Components
10.3.1 Non-return valve
10.3.2 Test taps
10.4 Specific design requirements
10.5 Performance tests
10.5.1 Procedures
10.5.2 Non-return valve closing pressure
10.5.3 Rated flow
10.5.4 Endurance
10.6 Sampling and frequency plans
11 Double check detector assembly (DCDA)
11.1 General
11.2 Application
11.3 Components
11.3.1 Main double check valve
11.3.2 Bypass line
11.3.3 Water meter
11.3.4 Secondary double check valve
11.4 Performance test
11.4.1 Procedures
11.4.2 Pressure drop
11.4.3 Endurance
11.5 Sampling and frequency plans
12 Reduced pressure zone device (RPZD)
12.1 General
12.2 Application
12.3 Components
12.3.1 Non-return valves
12.3.2 Relief valve
12.3.3 Test taps
12.4 Specific design requirements
12.4.1 Relief valve diaphragm or equivalent
12.4.2 Test taps
12.4.3 Relief valve opening
12.5 Performance tests
12.5.1 Procedures
12.5.2 Downstream non-return valve closing pressure
12.5.3 Intermediate chamber pressure
12.5.4 Supply pressure at which the intermediate chamber becomes atmospheric
12.5.5 Intermediate chamber pressure under backpressure conditions when the supply pressure is 14 kPa or greater
12.5.6 Intermediate chamber pressure under backpressure conditions, when the supply pressure is less than 14 kPa
12.5.7 Pressure differential at which relief valve commences to open
12.5.8 Supply pressure fluctuations and discharge from relief valve
12.5.9 Rated flow and pressure loss
12.5.10 Back-siphonage
12.5.11 Backpressure
12.5.12 Endurance
12.6 Sampling and frequency plans
13 Reduced pressure detector assembly (RPDA)
13.1 General
13.2 Application
13.3 Components
13.3.1 Main reduced pressure zone valve
13.3.2 Bypass line
13.3.3 Water meter
13.3.4 Secondary reduced pressure zone device
13.4 Performance test
13.4.1 Procedures
13.4.2 Pressure drop
13.4.3 Endurance
13.5 Sampling and frequency plans
14 Spill-resistant pressure vacuum breaker (SPVB)
14.1 General
14.2 Application
14.3 Components
14.3.1 Ventilation valve
14.3.2 Air port entry seal
14.3.3 Non-return valve
14.3.4 Test points
14.4 Specific design requirements
14.4.1 Air port shields
14.4.2 Test points
14.5 Performance tests
14.5.1 Procedures
14.5.2 Non-return valve closing pressure
14.5.3 Ventilation valve opening pressure
14.5.4 Air port entry seal
14.5.5 Air port opening area
14.5.6 Water rise
14.5.7 Rated flow and pressure loss
14.5.8 Critical level
14.5.9 Ability to resist adhesion between the ventilation valve sealing elements
14.5.10 Endurance
14.6 Sampling and frequency plans
15 Beverage dispenser dual check valve with atmospheric port (BDDC)
15.1 General
15.2 Application
15.3 Components
15.3.1 Ventilation valve
15.3.2 Non-return valves
15.3.3 Air port
15.4 Specific design requirements
15.4.1 Air port
15.4.2 Air port shields
15.4.3 Air port opening area
15.4.4 Strainers
15.5 Performance tests
15.5.1 Procedures
15.5.2 Non-return valve closing pressure
15.5.3 Air port leakage
15.5.4 Backflow through upstream non-return valve
15.5.5 Ventilation valve opening pressure
15.5.6 Back-siphonage under backpressure
15.5.7 Rated flow and pressure loss
15.5.8 Ability to withstand continuous pressure
15.5.9 Endurance
15.6 Sampling and frequency plans
16 Pipe interrupter device (PID)
16.1 General
16.2 Application
16.3 Components—Air inlets
16.4 Specific design requirements
16.4.1 Air ports
16.5 Performance test
16.5.1 Procedures
16.5.2 Torque test for screwed end devices
16.5.3 Air inlets
16.6 Sampling and frequency plans
17 Single check valve (testable) (SCVT)
17.1 General
17.2 Application
17.3 Components
17.3.1 Non-return valve
17.3.2 Test taps
17.4 Specific design requirements
17.5 Performance tests
17.5.1 Procedures
17.5.2 Non-return valve closing pressure
17.5.3 Rated flow and pressure loss
17.5.4 Endurance
17.6 Sampling and frequency plans
18 Single check detector assembly (testable) (SCDAT)
18.1 General
18.2 Application
18.3 Components
18.3.1 Main single check device
18.3.2 Bypass line
18.3.3 Water meter
18.3.4 Secondary check device
18.4 Performance tests
18.4.1 Procedures
18.4.2 Pressure drop
18.4.3 Endurance
18.5 Sampling and frequency plans
19 Marking and packaging
19.1 Marking
19.1.1 On the device
19.1.2 Nameplate or label
19.2 Packaging
20 Manufacturer’s data
20.1 Installation instructions
20.2 Maintenance instructions
Appendix A
A1 Scope
A2 Relevance
A3 Product certification
A4 Definitions
A5 Testing
A5.1 Type testing
A5.2 Batch release testing
A5.3 Retesting
A6 Sampling and frequency plans—Type tests and batch release tests
A6.1 Atmospheric vacuum breaker (AVB)
A6.2 Hose connection vacuum breaker (HCVB)
A6.3 Dual check valve with atmospheric port (DCAP)
A6.4 Dual check valve (Dual CV)
A6.5 Dual check valve with intermediate vent (Du CV)
A6.6 Pressure type vacuum breaker (PVB)
A6.7 Double check valve (DCV)
A6.8 Double check detector assembly (DCDA)
A6.9 Reduced pressure zone device (RPZD)
A6.10 Reduced pressure detector assembly (RPDA)
A6.11 Spill-resistant pressure vacuum breaker (SPVB)
A6.12 Beverage dispenser dual check valve with atmospheric port (BDDC)
A6.13 Pipe interrupter device (PID)
A6.14 Single check valve (testable) (SCVT)
A6.15 Single check detector assembly (testable) (SCDAT)
Appendix B
Appendix C
C1 Testing apparatus
C1.1 Pressurizing system
C1.2 End connections
C1.3 Torque wrenches
C1.4 Timing devices
C1.5 Sight glass
C1.6 Isolating valves
C1.7 Testing environment
C1.8 Conditioning of test devices
C1.9 Fouling wires
C1.10 Tolerances
C2 Testing sequence
C3 Instrumentation
C3.1 General
C3.2 Flow meter—For use with air
C3.3 Flow meter—For use with water
C3.4 Pressure devices—For use with air and water
C3.5 Temperature-indicating device
C3.6 Timing device
C3.7 Sight glass
C3.8 Failure of device during testing
Appendix D
D1 Scope
D2 Testing temperature
D3 Apparatus
D4 Procedure
D5 Test report
Appendix E
E1 Scope
E2 Testing temperature
E3 Apparatus
E4 Procedure
E5 Test report
Appendix F
F1 Scope
F2 Testing temperature
F3 Apparatus
F4 Procedure
F5 Test report
Appendix G
G1 Scope
G2 Testing temperature
G3 Apparatus
G4 Procedure
G5 Test report
Appendix H
H1 Scope
H2 Testing temperature
H3 Apparatus (see Figure H1)
H4 Procedure
H5 Test report
Appendix I
I1 Scope
I2 Testing temperature
I3 Apparatus (see Figure I1)
I4 Procedure
I5 Test report
Appendix J
J1 Scope
J2 Testing temperature
J3 Apparatus
J4 Procedure
J5 Test report
Appendix K
K1 Scope
K2 Testing temperature
K3 Apparatus
K4 Procedure
K5 Test report
Appendix L
L1 Scope
L2 Testing temperature
L3 Apparatus
L4 Procedure
L5 Test report
Appendix M
M1 Scope
M2 Testing temperature
M3 Apparatus (see Figure M1)
M4 Procedure
M5 Report
Appendix N
N1 Scope
N2 Testing temperature
N3 Apparatus
N4 Procedure
N5 Test report
Appendix O
O1 Scope
O2 Testing temperature
O3 Apparatus
O4 Procedure
O5 Test report
Appendix P
P1 Scope
P2 Testing temperature
P3 Apparatus
P4 Procedure
P5 Test report
Appendix Q
Q1 Scope
Q2 Testing temperature
Q3 Apparatus
Q4 Procedure
Q5 Test report
Appendix R
R1 Scope
R2 Testing temperature
R3 Apparatus
R4 Procedure
R5 Test report
Appendix S
S1 Scope
S2 Testing temperature
S3 Apparatus
S4 Procedure
S5 Test report
Appendix T
T1 Scope
T2 Testing temperature
T3 Apparatus
T4 Procedure
T5 Test report
Appendix U
U1 Scope
U2 Testing temperature
U3 Apparatus
U4 Procedure
U5 Test report
Appendix V
V1 Scope
V2 Testing temperature
V3 Apparatus
V4 Procedure
V5 Test report
Appendix W
W1 Scope
W2 Testing temperature
W3 Apparatus
W4 Procedure
W5 Test report
Appendix X
X1 Scope
X2 Testing temperature
X3 Apparatus
X4 Procedure
X5 Test report
Appendix Y
Y1 Scope
Y2 Testing temperature
Y3 Apparatus
Y4 Procedure
Y5 Test report
Appendix Z
Appendix AA
AA1 Scope
AA2 Testing temperature
AA3 Apparatus
AA4 Procedure
AA5 Test report
Appendix BB
BB1 Scope
BB2 Testing temperature
BB3 Apparatus
BB4 Procedures
BB5 Test report
Appendix CC
CC1 Scope
CC2 Testing temperature
CC3 Apparatus
CC4 Procedure
CC5 Report
Appendix DD
DD1 Scope
DD2 Testing temperature
DD3 Apparatus
DD4 Procedure
DD5 Test report
Appendix EE
EE1 Scope
EE2 Testing temperature
EE3 Apparatus
EE4 Procedure
EE4.1 Pressure type vacuum breaker and spill-resistant pressure vacuum breaker
EE4.2 Vacuum breaker check device
EE5 Test report
Appendix FF
FF1 Scope
FF2 Testing temperature
FF3 Apparatus
FF4 Procedure
FF5 Report
Appendix GG
GG1 Scope
GG2 Testing temperature
GG3 Apparatus
GG4 Procedure
GG5 Test report
Appendix HH
HH1 Scope
HH2 Testing temperature
HH3 Apparatus
HH4 Procedure
HH5 Test report
Appendix II
II1 Scope
II2 Testing temperature
II3 Apparatus
II4 Procedure
II5 Test report
Appendix JJ
JJ1 Scope
JJ2 Temperature of measurement
JJ3 Apparatus
JJ4 Procedure
JJ5 Test report
Appendix KK
KK1 Scope
KK2 Temperature of measurement
KK3 Apparatus
KK4 Procedure
KK5 Test report
Appendix LL
LL1 Scope
LL2 Temperature of measurement
LL3 Apparatus
LL4 Procedure
LL5 Test report
Appendix MM
MM1 Scope
MM2 Temperature of measurement
MM3 Apparatus
MM4 Procedure
MM5 Test report
Appendix NN
NN1 Scope
NN2 Temperature of measurement
NN3 Apparatus
NN4 Procedure
NN5 Test report
Appendix OO
OO1 Scope
OO2 Temperature of measurement
OO3 Apparatus
OO4 Procedure
OO5 Test report
Appendix PP
PP1 Scope
PP2 Temperature of measurement
PP3 Principle
PP4 Application
PP5 Apparatus
PP6 Procedure
PP7 Test report
Appendix QQ
QQ1 Scope
QQ2 Temperature of measurement
QQ3 Apparatus
QQ4 Procedure
QQ5 Report
Appendix RR
RR1 Scope
RR2 Temperature of measurement
RR3 Principle
RR4 Apparatus
RR5 Procedure
RR6 Report
Appendix SS
SS1 Scope
SS2 Temperature of measurement
SS3 Apparatus
SS4 Procedure
SS5 Report
Appendix TT
TT1 Scope
TT2 Composition
TT2.1 General
TT2.2 Reprocessable material
TT2.3 Plastics-moulded material test
TT2.4 Plastics-bodied device test
TT2.5 Opacity test
TT2.6 UV resistance
TT3 Freedom from defects
TT4 Threaded end connections on devices
TT5 Flanged ends on devices
TT6 Devices intended for connection to pipe systems
TT7 Performance requirements for joints
TT7.1 General
TT7.2 Hydrostatic pressure test for assembled joints
TT7.3 Liquid infiltration test
TT7.4 Leaktightness under pressure when subjected to bending
Cited references in this standard
[Superseded]
Water supply — Backflow prevention devices, Part 3: Field testing and maintenance of testable devices
[Current]
Meters for cold and heated drinking and non-drinking water supplies, Part 1: Technical requirements
[Current]
Methods of testing plastics and composite materials sanitary plumbing fixtures, Method 5: Determination of degradation by ultraviolet light
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