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AS/NZS 3500.1.2:1998

[Available Superseded]

National plumbing and drainage, Part 1.2: Water supply — Acceptable solutions

Specifies the requirements for the installation of water services from the authority's water main or alternative portable water supplies to the points of discharge. The standard applies to new installations as well as alterations, additions and repairs to existing installations.
Published: 05/02/1998
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Table of contents
Cited references
Content history
Table of contents
Header
About this publication
PREFACE
FOREWORD
1 SCOPE AND GENERAL
1.1 SCOPE
1.2 REFERENCED DOCUMENTS
1.3 DEFINITIONS
1.4 CLASSIFICATION OF SOILS
1.5 EQUIVALENT PIPE SIZES
1.6 REQUIREMENTS FOR DISABLED PERSONS
2 MATERIALS AND PRODUCTS
2.1 SCOPE OF SECTION
2.2 AUTHORIZATION
2.3 SELECTION AND USE OF MATERIALS
2.4 LIMITS ON USE OF PIPES AND FITTINGS
2.4.1 Acrylonitrile butadiene styrene (ABS)
2.4.2 Black steel pipes and fittings
2.4.3 Cast iron fittings (grey cast iron)
2.4.4 Copper
2.4.5 Copper alloy
2.4.6 Ductile iron
2.4.7 Galvanized steel
2.4.8 Polybutylene (PB)
2.4.9 Polyethylene (PE)
2.4.10 Cross-linked polyethylene (PE-X)
2.4.11 Polypropylene (PP-R)
2.4.12 Unplasticized polyvinyl chloride (UPVC)
2.4.13 Chlorinated polyvinyl chloride (CPVC)
2.4.14 Stainless steel
2.5 STORAGE TANK MATERIALS
2.6 JOINTING
2.6.1 Elastomeric rings
2.6.2 Elastomeric gaskets
2.6.3 Silver brazing alloy
2.6.3.1 Copper and copper alloys
2.6.3.2 Stainless steels
2.6.4 Soft solders
2.6.5 Rolled grooved joints
2.7 CONCRETE AND MORTAR
2.7.1 Cement
2.7.2 Fine aggregate (sand)
2.7.3 Coarse aggregate (metal)
2.7.4 Concrete mix
2.7.5 Cement mortar
2.7.6 Chemical admixtures
2.7.7 Water for concrete and mortar
2.7.8 Steel reinforcement
2.8 MISCELLANEOUS MATERIALS
2.8.1 Timber
2.8.2 Thermal insulation
2.8.3 External protective coatings
2.9 SAFE TRAY AND SAFE WASTE MATERIALS
2.9.1 Safe tray
2.9.2 Safe wastes
2.10 BACKFLOW PREVENTION DEVICES
3 SIZING OF WATER SERVICES
3.1 SCOPE OF SECTION
3.2 FLOW REQUIREMENTS
3.2.1 Water flow rates at outlets
3.2.2 Loading units
3.2.3 Probable simultaneous demand
3.2.4 Probable simultaneous flow rate
3.3 PRESSURE REQUIREMENTS
3.3.1 Available pressure
3.3.2 Pressure at outlets
3.3.3 Head losses
3.4 VELOCITY REQUIREMENTS
3.5 PIPE SIZE LIMITATIONS
3.5.1 Water service
3.5.2 Branch offtakes
4 CROSS-CONNECTION CONTROL AND BACK FLOW PREVENTION
4.1 SCOPE OF SECTION
4.2 PROTECTION OF POTABLE WATER SUPPLIES
4.2.1 Design
4.2.2 Quality of water supply
4.2.3 Introduction of contaminants
4.2.4 Combined tanks serving flush valves (other than directly connected)
4.2.5 Alternative water supplies
4.2.6 Authorized fixtures, appliances or apparatus
4.3 CROSS-CONNECTION HAZARD RATING
4.4 PROVISION OF BACKFLOW PREVENTION DEVICES
4.4.1 General
4.4.2 Type of backflow protection
4.4.3 Hose taps
4.4.4 Additional backflow protection
4.4.5 Water downstream of backflow prevention device
4.4.6 Inspection and maintenance
4.4.7 Hot water systems
4.5 SUITABILITY OF DEVICES FOR HAZARDS
4.6 INSTALLATION OF BACKFLOW PREVENTION DEVICES
4.6.1 General installation requirements
4.6.2 Location of devices
4.6.2.1 General
4.6.2.2 Accessibility
4.6.2.3 Drainage and leakage
4.6.3 Specific installation requirements for testable and non-testable devices
4.6.3.1 General
4.6.3.2 Testable devices
4.6.3.3 Non-testable devices
5 INSTALLATION OF COLD WATER SERVICES
5.1 SCOPE OF SECTION
5.2 ELECTRICAL SAFETY PRECAUTIONS EARTHING
5.3 PROXIMITY TO OTHER SERVICES
5.3.1 Electrical cables and gaspipes
5.3.1.1 Water services
5.3.1.2 Crossover
5.3.2 Drains
5.4 ISOLATING VALVES
5.4.1 General
5.4.2 Maintenance
5.5 LOCATION AND ACCESS WITHIN AND UNDER BUILDINGS
5.5.1 Location
5.5.2 Concealed piping
5.5.2.1 Walls
5.5.2.2 Chases, ducts or conduits
5.5.2.3 Under concrete slabs
5.6 METHODS OF JOINTING
5.6.1 General
5.6.2 Threading
5.6.3 Bolted-gland and gibault type joints
5.6.3.1 General
5.6.3.2 Joints below ground
5.6.4 Non-metallic friction locked joints
5.6.5 Compression joints
5.6.6 Capillary fittings
5.6.7 Flanged joints
5.6.8 Elastomeric ring joints
5.6.9 Shouldered or grooved joints
5.6.10 Silver brazing
5.6.10.1 Joints
5.6.10.2 Taps and valves
5.6.11 Soft soldering
5.6.12 Solvent cement joints
5.6.13 Jointing of stainless steel pipe and fittings
5.6.13.1 Jointing of piping, up to and including DN 25
5.6.13.2 Jointing of piping larger than DN 25
5.7 SUPPORT AND FIXING ABOVE GROUND
5.7.1 General
5.7.2 Brackets, clips and hangers
5.7.3 Prohibited supports
5.7.4 Spacing
5.8 STANDPIPES
5.9 ANCHORAGE BELOW GROUND
5.9.1 General
5.9.2 Location of thrust blocks (see Figure 5.2)
5.9.3 Construction of thrust blocks
5.9.4 Curing time for thrust blocks
5.10 DEPTH OF COVER IN PUBLIC AREAS
5.11 DEPTH OF COVER IN PRIVATE AREAS
5.12 BEDDING AND BACKFILL
5.13 CONTAMINATED AREAS
5.13.1 General
5.13.2 Installation
5.14 CORROSIVE AREAS
5.14.1 General
5.14.2 Galvanic corrosion
5.15 WATER-CHARGED OR FILLED GROUND
5.16 OPEN CHANNELS OR WATERCOURSES
5.17 PRIVATE EASEMENTS
5.17.1 Proximity of water services
5.17.2 Depth of piping
5.18 DRY SERVICES
5.19 FROST PROTECTION
5.19.1 Requirement for protection
5.19.2 Piping located outside buildings
5.19.3 Pipes located on metal roofs
5.19.4 Pipes located inside buildings
5.19.4.1 General
5.19.4.2 Pipes in unheated roof spaces
5.19.4.3 Pipes adjacent to external walls
5.19.5 Insulation of piping
5.20 GENERAL PRECAUTIONS FOR PLASTICS PIPES AND FITTINGS
5.21 IDENTIFICATION
5.22 THERMOSTATIC MIXING VALVES
6 FIRE SERVICES
6.1 SCOPE OF SECTION
6.2 GENERAL
6.3 MATERIALS AND PRODUCTS
6.4 INSTALLATION
6.5 WATER SUPPLY TO A FIRE HYDRANT OR SPRINKLER SERVICE
6.6 FIRE HYDRANTS
6.6.1 General
6.6.2 Fabrication of steel fittings
6.7 HOSE REELS
6.8 FIRE SPRINKLER SERVICES
6.8.1 General
6.8.2 Sprinkler valve assembly
6.9 WINDOW OR WALL DRENCHER SPRINKLER SYSTEM
6.10 WATER STORAGE TANKS
6.11 PRESSURE REDUCTION
6.12 PUMPS
6.13 IDENTIFICATION
7 IRRIGATION AND LAWN-WATERING SYSTEMS
7.1 SCOPE OF SECTION
7.2 SYSTEM TYPES
7.3 BACKFLOW PROTECTION REQUIREMENTS
7.4 MATERIALS
8 WATER STORAGE TANKS
8.1 SCOPE OF SECTION
8.2 PURPOSE OF TANKS
8.2.1 General
8.2.2 Limitations on use
8.3 TANK MATERIALS
8.3.1 Permitted materials
8.3.2 Prohibited materials
8.4 INSTALLATION
8.4.1 General
8.4.2 Access
8.4.3 Internal corrosion protection
8.4.4 Location
8.5 TANK DESIGN
8.5.1 General
8.5.2 Tank cover
8.5.3 Safe-tray
8.5.3.1 General
8.5.3.2 Safe tray construction
8.5.3.3 Overflow
8.5.4 Placement of tank
8.5.5 Size of air gap
8.5.6 Tank overflow
8.5.6.1 General
8.5.6.2 Discharge of overflow
8.5.6.3 Discharge not readily visible
8.5.6.4 Materials for overflow
8.6 CAPACITY OF STORAGE TANKS
8.6.1 Measurement of capacity
8.6.2 Contingency reserve
8.7 INLET PIPING
8.7.1 Connections
8.7.2 Stop valve
8.8 OUTLET PIPING
8.8.1 Connections
8.8.2 Service outlets
8.9 SLUDGE VALVES
8.10 FIRE SERVICES TANKS
8.11 MARKING OF TANKS
9 WATER FOR SANITARY FLUSHING
9.1 SCOPE OF SECTION
9.2 GENERAL
9.3 FLUSHING REQUIREMENTS
9.4 URINALS
9.4.1 Quantity of flushing water
9.4.2 Automatic cisterns
9.4.3 Programmed flushing systems
9.4.4 Flushing devices operated on demand
9.4.5 Location of flush valves
9.5 INSTALLATION OF CISTERNS
9.5.1 General
9.5.2 Urinal type cisterns
9.5.3 Manually operated cisterns
9.5.4 Water closet pan and slop hopper pan type cisterns
9.6 FLUSH VALVES SUPPLIED FROM BREAK TANKS
9.6.1 General
9.6.2 Capacity
9.6.3 Operating head
9.6.4 Urinal type flush valves
9.7 FLUSH PIPES AND WATER FLOW DISTRIBUTION
9.8 PRESSURE RATIO VALVES
9.8.1 General
9.8.2 Requirement for pressure gauges
9.9 FLUSH VALVES CONNECTED TO THE POTABLE WATER SERVICE
9.9.1 General
9.9.2 Compatibility
9.9.3 Pipe size
9.9.4 Protection
9.9.5 Location
9.9.6 Pressure and velocity limitations
9.9.7 Branch service pipe
10 PUMPS
10.1 SCOPE OF SECTION
10.2 GENERAL
10.3 CONTROL OF PUMPS
10.4 INSTALLATION OF PUMPS
10.5 BOOSTER PUMPS
11 WATER REQUIREMENTS FOR HAEMODIALYSIS MACHINES
11.1 SCOPE OF SECTION
11.2 CONNECTION TO THE WATER SERVICE
11.3 MAINTENANCE OF FLOW RATE
11.4 WATER METER IDENTIFICATION
12 INSTALLATION OF WATER METERS
12.1 SCOPE OF SECTION
12.2 LOCATION OF WATER METERS
12.3 INSTALLATION OF WATER METERS
12.3.1 General
12.3.2 Inside buildings
12.3.3 Below ground
12.4 PROTECTION
12.5 ELECTRICAL SAFETY PRECAUTIONS
12.6 SUPPORT
12.7 FROST PROTECTION
13 TESTING AND COMMISSIONING
13.1 SCOPE OF SECTION
13.2 TESTING
13.2.1 Hydrostatic test
13.2.2 Storage tanks
13.3 CLEANING AND DISINFECTION OF STORAGE TANKS
13.4 DISINFECTION OF WATER SERVICES
13.5 COMMISSIONING
APPENDIX A
APPENDIX B
B1 GENERAL
B2 PROCEDURE
APPENDIX C
C1 GENERAL
C2 PROCEDURE
C3 EXAMPLE
APPENDIX D
D1 SCOPE
D2 POTENTIAL CROSS-CONNECTIONS
APPENDIX E
E1 GENERAL
APPENDIX F
F1 GENERAL
F2 INFLOW RATE
F3 OVERFLOW SIZE AND SPILLING LEVEL
F4 AIR GAP
F5 HEIGHT OF INLET ABOVE INVERT LEVEL OF OVERFLOW
APPENDIX G
G1 GENERAL
G2 CLEANING
G3 DISINFECTION
APPENDIX H
H1 GENERAL
H2 PRECAUTIONS AGAINST CONTAMINATION
H3 FLUSHING OF WATER SERVICES
H4 CHLORINATION
H5 FINAL FLUSHING
Amendment control sheet
Cited references in this standard
NZS 3631
New Zealand timber grading rules
NZS 3604
Code of practice for light timber frame buildings not requiring specific design
NZS 3501
Specification of copper tubes for water, gas and sanitation
NZS 3422
Specification for welded fabric of drawn steel wire for concrete reinforcement
NZS 3402
Steel bars for reinforcement of concrete
Content history
[Available Superseded]
[Available Superseded]
[Withdrawn]
[Withdrawn]
[Withdrawn]