OF AUSTRALIA

1 WATER SUPPLY CODE OF AUSTRALIAWSA 03 2011 WATER SERVICES ASSOCIATIONOF AUSTRALIAWSAA WATER SUPPLY CODE OF AUSTRALIA WSA 03 2011 Version Water Supply Code of AUSTRALIA WSA 03 2011 Third Edition Version Previous edition WSA 03: CONTENTS PREFACE 6 INTRODUCTION 9 PART 0: GLOSSARY OF TERMS AND ABBREVIATIONS I Glossary of Terms 12 II Abbreviations 26 III Referenced Documents 30 PART 1: PLANNING AND DESIGN Contents 36 1 General 48 2 System Planning 55 3 Hydraulic Design 75 4 Products and Materials 83 5 General Design 97 6 System Pressure Management 133 7 Structural Design 156 8 Appurtenances 187 9 Design Review and Drawings 228 PART 2: CONSTRUCTION Contents 234 10 General 239 11 General Construction 241 12 Products and Materials 250 13 Excavation 255 14 Bedding for Pipes 261 15 Pipe Laying, Jointing and Connecting 262 16 Pipe Embedment and Support 275 17 Fill 277 18 Swabbing 280 19 Acceptance Testing 282 20 Disinfection 287 21 Tolerances on As-Constructed Work 288 22 Connections to Existing Water Mains 290 23 Restoration 293 24 Work As Constructed Details 295 WATER SUPPLY CODE OF AUSTRALIA VERSION APPENDICES Appendix A Generic Infrastructure Protection Guidance Appendix B Equivalent Pipe Sizes for Commonly Used Materials Appendix C Under Pressure Cut-In Connection to Pressure Pipes DN 80 Appendix D Booster Configurations Appendix E Selection of Pressure Accumulator Tanks Appendix F Water Mains in Slip and Potentially Unstable Areas Appendix G Soil Classification Guidelines and Allowable Bearing Pressures for Anchors and Thrust Blocks Appendix H Hydrant Spacings Appendix I Disinfection of

2 Water Mains Appendix J Safety Assurance Plan and Job Safety Analysis Appendix K Connectivity Inspection of Dual Water Supply Systems Water Supply Code of AUSTRALIA Part 1: Planning and Design Third Edition Version WSA 03 2002 COPYRIGHT CONTENTS 1 GENERAL SCOPE PLANNING AND DESIGN Objectives Scope and requirements Concept plan format Critical infrastructure protection Asset categorisation All hazards Infrastructure protection Detailed design Designer s needs and responsibilities Requirements to be addressed Design outputs Design life Instrumentation and control systems CONSULTATION WITH OTHER PARTIES 2 SYSTEM PLANNING GENERAL SYSTEM PLANNING PROCESS General Extending / upgrading an existing water supply system Providing a new water supply Non-drinking water as drinking water substitution DEMANDS General Dual water supply systems General Rainwater tanks Demand assessment General

3 Residential Non-residential Peak demands General Peak day demand Peak hour demand SYSTEM CONFIGURATION SYSTEM HYDRAULICS General Network analysis Operating pressures Service pressure Maximum allowable service pressure Minimum service pressure Average service pressure Pressure variation analysis Determining supply zones General Use of minimum allowable or desirable minimum service pressures Use of desirable minimum static pressure WSA 03 COPYRIGHT 37 WATER QUALITY General Prevention of back siphonage Water age Disinfection SEPARATION OF DRINKING AND NON-DRINKING WATER SUPPLY SYSTEMS Permanent cross links and cross connections Temporary cross links PUMPING STATIONS General Design factors System related factors Site related factors Service related factors Concept design SERVICE RESERVOIRS Storage capacity Location TRENCHLESS TECHNIQUES FOR PIPELAYING FUTURE SYSTEM EXPANSION SYSTEM REVIEW 3 HYDRAULIC DESIGN SIZING General Minimum pipe sizes Empirical sizing of reticulation mains Dual water supply systems Fire flows Sizing by analysis General Head losses Hydraulic roughness values Flow velocities DESIGN PRESSURES General Gravity systems Systems subjected to dynamic pressures PRESSURE CLASS OF SYSTEM COMPONENTS Gravity systems Systems subjected to dynamic pressures THRUST AND ANCHOR BLOCK DESIGN SYSTEM TEST PRESSURE DESIGN FOR DYNAMIC STRESSES General Surge Fatigue Fatigue de-rating of plastics pipes and fittings

4 TEMPERATURE DE-RATING OF PLASTICS PIPES AND FITTINGS PIPELINE COMPONENTS MINIMUM PRESSURE CLASS WSA 03 2002 COPYRIGHT 4 PRODUCTS AND MATERIALS GENERAL DIFFERENTIATION OF DRINKING AND NON-DRINKING PIPE SYSTEMS Principles Water supply mains drinking water Water supply mains non-drinking water Property services drinking water Property services non-drinking water Marking tapes DUCTILE IRON PIPELINE SYSTEMS Product Specifications Sizes and configurations Seal coating of lining Sleeving Screw-on flanges for DI pipes Flanged joints PVC PIPELINE SYSTEMS PE PIPELINE SYSTEMS STEEL PIPELINE SYSTEMS Product Specifications Sizes and configurations Joints Field welding Flanged joints GRP PIPELINE SYSTEMS PROTECTION AGAINST DEGRADATION Application Protection against aggressive environments Protection against damage to coatings Stainless steels Grade selection Welding Threaded components Cathodic protection Stray current corrosion Protection against contaminated ground Bolted connections 5 GENERAL DESIGN GENERAL REQUIREMENTS Design tolerances Levels Water main renewals electrical safety and earthing to water services Environmental considerations General Urban salinity RETICULATION DESIGN FOR WATER QUALITY Layout of water mains Looped mains Link mains Reduced size mains WATER MAIN ACCESS LOCATION OF WATER MAINS WSA 03 COPYRIGHT 39 General Water mains in road reserves General Location in footway Location in carriageway Location in roundabouts and bus

5 Bays Location in other than dedicated public road reserves Water mains in easements Dual water supply systems Effect on vegetation Water mains near trees Contaminated sites Crossings General Requirements for encased pipe installations Railway reserves Crossings of creeks or drainage reserves Overhead power lines and transmission towers Water mains in conjunction with landscaping and/or other development Water mains on curved alignments Location markers Marking tape General Mains Property services TRENCHLESS TECHNOLOGY SHARED TRENCHING DUPLICATE MAINS RIDER MAINS CONNECTION OF NEW MAINS TO EXISTING MAINS TERMINATION POINTS Permanent ends of water mains Temporary ends of water mains Chlorination assemblies Flushing points PROPERTY SERVICES General Connections to water mains Services.

6 Outlets and meters OBSTRUCTIONS AND CLEARANCES General Surface obstructions Clearance from transmission towers Clearance from structures and property boundaries Underground obstructions and services General Clearance requirements Deviation of water mains General Horizontal deviation of water mains Vertical deviation of water mains Curving of pipes to avoid obstructions DISUSED OR REDUNDANT PIPELINES WSA 03 2002 COPYRIGHT 6 SYSTEM PRESSURE MANAGEMENT GENERAL IN-LINE PRESSURE BOOSTER PUMPING STATIONS Planning criteria Concept design General Life cycle considerations Functionality Due diligence requirements Reliability Maintainability Materials design Location Site selection Noise control Services Access Site drainage Landscaping Security Signage Supporting systems Health and safety Commissioning plan General Pre-commissioning Commissioning System planning and modelling Modelling Minimum pressure affecting the area Number of affected properties within the low pressure zone Booster design General Connection to the network Maximum flow and pressure requirements Design for minimum pressure boost conditions Design for minimum flow conditions Booster configuration design Booster set and pump selection Booster pipework and manifold design Booster equipment and devices Site specific requirements Booster pipework General design parameters Manifolds, off-takes.

7 Suction and delivery pipework Pressure gauges and tappings Pressure accumulator tank Power system and supply General Security of supply Primary supply Duplicate supply Emergency power On-site generator Mobile generator Power factor correction Lighting WSA 03 COPYRIGHT 41 Control and telemetry system General Instrumentation System requirements Fire flow operation Alarms and controls General Control switches manual and emergency operation Telemetry General Software Communications PRESSURE REDUCING VALVE INSTALLATIONS Planning criteria Design requirements PRESSURE SUSTAINING VALVE INSTALLATIONS Planning criteria Design requirements 7 STRUCTURAL DESIGN GENERAL STRUCTURAL CONSIDERATIONS INTERNAL FORCES EXTERNAL FORCES General Pipe cover Embedment zone dimensions Pipe embedment Buoyancy GEOTECHNICAL CONSIDERATIONS General Water mains in engineered or controlled fill Water mains in non-engineered fill Construction of an embankment CONCRETE ENCASEMENT General Requirements Encased steel pipelines General Existing steel pipelines WATER MAINS IN UNSTABLE GROUND General Mine subsidence areas Slip areas ABOVE-GROUND WATER MAINS PIPELINE ANCHORAGE General Thrust blocks General Concrete thrust blocks Use of puddle flanges to transfer thrust Timber and recycled plastics thrust blocks Anchor blocks WSA 03 2002 COPYRIGHT Thrust and anchor blocks for dual water supply systems Restrained elastomeric seal joint water mains

8 Restraint requirements for special situations Above-ground mains with unrestrained flexible joints Buried steel mains with welded joints Above-ground steel mains with welded joints Ductile iron and steel mains with flanged joints PE mains BULKHEADS AND TRENCHSTOPS UNFORESEEN GROUND CONDITIONS 8 APPURTENANCES VALVES GENERAL Valving design Valve siting principles Selection considerations Local in-line booster pumping stations Plastics identification covers STOP VALVES Product Specifications Installation design and selection criteria General Gate valves Butterfly valves Stop valves for transfer/distribution mains Stop valves for reticulation mains Stop valves for local in-line booster pumping stations Bypass of stop valve Stop valves location and arrangements General Arrangement 1 Arrangement 2 Arrangement 3 Arrangement 4 Arrangement 5 Arrangement 6 Arrangement 7 Stop valve special arrangements Rider mains and network configurations Crossing mains interconnection CONTROL VALVES Product Specifications Automatic inlet control valves (AICV) Pressure reducing valves (PRV) Pressure relief valves (PRelV) Pump control valves Pressure sustaining valves (PSV) AIR VALVES (AV)

9 Product Specifications Installation design criteria Air valves type Air valves size Air valves location Use of hydrants as an alternative to air valves Water sampling via air valves WSA 03 COPYRIGHT 43 NON-RETURN VALVES Product Specifications Installation design criteria Non-return valves for local in-line booster pumping stations and boosted zones SCOURS AND PUMP-OUT BRANCHES Location and arrangements Design Scour application Scour size Scour location SWABBING POINTS HYDRANTS ERROR! BOOKMARK NOT DEFINED. Product Specifications Purposes Hydrant siting principles Hydrant types Hydrant installation Hydrant outlet connections Hydrant size Hydrant spacing Hydrant location Hydrants for reticulation system operational requirements Hydrants at ends of mains DISINFECTION FACILITIES General Reticulation mains Transfer and distribution mains Discharge SURFACE FITTINGS Product Specifications General Mar