Title AS/NZS 3500.1.2:1998 National plumbing and drainage - Water supply - Acceptable solutions Licensee Licensed to LUU MINH LUAN on 26 Feb 2002 Conditions of use This is a licensed electronic copy of a document where copyright is owned or managed by Standards Australia International Your licence is a single user licence and the document may not be stored, transferred or otherwise distributed on a network You may also make one paper copy of this document if required Web Check-up AS/NZS 3500.1.2:1998 Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited Australian/New Zealand Standard National plumbing and drainage Part 1.2: Water supply— Acceptable solutions AS/NZS 3500.1.2:1998 This Joint Australian/New Zealand Standard was prepared by Joint Technical Committee WS/14, National Plumbing and Drainage Code It was approved on behalf of the Council of Standards Australia on 14 November 1997 and on behalf of the Council of Standards New Zealand on December 1997 It was published on February 1998 Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited The following interests are represented on Committee WS/14: Association of Hydraulic Services Consultants Australia AUSTAP Australian Association of Certification Bodies Australian Building Codes Board Australian Chamber of Manufactures Australian Gas Association Brisbane Water Department of Environment and Land Mangement, Tas Department of Lands Planning and Environment, N.T Department of Land and Water Conservation, N.S.W Department of Urban Services, A.C.T Electricity Supply Association of Australia Gas Appliance Manufacturers Association of Australia Housing Industry Association, Australia Master Builders Australia Master Plumbers Australia Metal Trades Industry Association of Australia National Association Sanitary Plumbing and Drainage Contractors, Australia New Zealand Manufacturers Federation New Zealand Society of Master Plumbers and Gasfitters Plastics and Chemicals Industry Association, Australia Plumbers, Gasfitters and Drainlayers Board of New Zealand Plumbing Industry Board, Australia Queensland Department of Local Government and Planning South Australian Water Corporation South Australian Health Commission Sydney Water Corporation Review of Standards To keep abreast of progress in industry, Joint Australian/ New Zealand Standards are subject to periodic review and are kept up to date by the issue of amendments or new editions as necessary It is important therefore that Standards users ensure that they are in possession of the latest edition, and any amendments thereto Full details of all Joint Standards and related publications will be found in the Standards Australia and Standards New Zealand Catalogue of Publications; this information is supplemented each month by the magazines ‘The Australian Standard’ and ‘Standards New Zealand’, which subscribing members receive, and which give details of new publications, new editions and amendments, and of withdrawn Standards Suggestions for improvements to Joint Standards, addressed to the head office of either Standards Australia or Standards New Zealand, are welcomed Notification of any inaccuracy or ambiguity found in a Joint Australian/New Zealand Standard should be made without delay in order that the matter may be investigated and appropriate action taken This Standard was issued in draft form for comment as DR 96403 AS/NZS 3500.1.2:1998 Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited Australian/New Zealand Standard National plumbing and drainage Part 1.2: Water supply— Acceptable solutions Originated in Australia as AS 3500.1— 1990 Final Australian edition AS 3500.1— 1992 Jointly revised and redesignated AS/NZS 3500.1.2:1998 PUBLISHED JOINTLY BY: STANDARDS AUSTRALIA The Crescent, Homebush NSW 2140 Australia STANDARDS NEW ZEALAND Level 10, Radio New Zealand House, 155 The Terrace, Wellington 6001 New Zealand ISBN 7337 1687 AS/NZS 3500.1.2:1998 PREFACE This Standard was prepared by the Joint Standards Australia / Standards New Zealand Committee WS/14, National Plumbing and Drainage Code, to supersede AS 3500.1 — 1992 The object of this revision is to issue it as a Joint Australian/New Zealand Standard with minimum deemed-to-satisfy requirements and incorporate amendments and additions from industry requirements compatible with legislation of authorities who can enforce regulations and authorize products for connection to their systems Noise levels have not been included as progress on a unified method of analysis has not been agreed upon and further research is required Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited Attention is drawn to the publication of SAA/SNZ Rul PL/1, Rulings to the Joint Australia/New Zealand Plumbing and Drainage Code Where Rulings of public significance are issued, they will be available from Standards Australia through a subscription service When rulings are included in an amendment, the specific ruling will be withdrawn at the time of publication of the amendment Enquiries should be directed to Standards Australia The terms ‘normative’ and ‘informative’ have been used in this Standard to define the application of the appendix to which they apply A ‘normative’ appendix is an integral part of a Standard, whereas an ‘informative’ appendix is only for information and guidance  Copyright STANDARDS AUSTRALIA/ STANDARDS NEW ZEALAND Users of Standards are reminded that copyright subsists in all Standards Australia and Standards New Zealand publications and software Except where the Copyright Act allows and except where provided for below no publications or software produced by Standards Australia or Standards New Zealand may be reproduced, stored in a retrieval system in any form or transmitted by any means without prior permission in writing from Standards Australia or Standards New Zealand Permission may be conditional on an appropriate royalty payment Australian requests for permission and information on commercial software royalties should be directed to the head office of Standards Australia New Zealand requests should be directed to Standards New Zealand Up to 10 percent of the technical content pages of a Standard may be copied for use exclusively in-house by purchasers of the Standard without payment of a royalty or advice to Standards Australia or Standards New Zealand Inclusion of copyright material in computer software programs is also permitted without royalty payment provided such programs are used exclusively in-house by the creators of the programs Care should be taken to ensure that material used is from the current edition of the Standard and that it is updated whenever the Standard is amended or revised The number and date of the Standard should therefore be clearly identified The use of material in print form or in computer software programs to be used commercially, with or without payment, or in commercial contracts is subject to the payment of a royalty This policy may be varied by Standards Australia or Standards New Zealand at any time AS/NZS 3500.1.2:1998 CONTENTS Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited Page FOREWORD SECTION 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 7 7 7 SECTION 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 2.5 STORAGE TANK MATERIALS 2.6 JOINTING 2.7 CONCRETE AND MORTAR 2.8 MISCELLANEOUS MATERIALS 2.9 SAFE TRAY AND SAFE WASTE MATERIALS 2.10 BACKFLOW PREVENTION DEVICES 10 10 10 10 14 14 15 16 16 16 SECTION SIZING OF WATER SERVICES 3.1 SCOPE OF SECTION 3.2 FLOW REQUIREMENTS 3.3 PRESSURE REQUIREMENTS 3.4 VELOCITY REQUIREMENTS 3.5 PIPE SIZE LIMITATIONS 17 17 17 18 18 SECTION CROSS-CONNECTION CONTROL AND BACKFLOW PREVENTION 4.1 SCOPE OF SECTION 4.2 PROTECTION OF POTABLE WATER SUPPLIES 4.3 CROSS-CONNECTION HAZARD RATING 4.4 PROVISION OF BACKFLOW PREVENTION DEVICES 4.5 SUITABILITY OF DEVICES FOR HAZARDS 4.6 INSTALLATION OF BACKFLOW PREVENTION DEVICES 21 21 22 22 23 26 SECTION INSTALLATION OF COLD WATER SERVICES 5.1 SCOPE OF SECTION 5.2 ELECTRICAL SAFETY PRECAUTIONS EARTHING 5.3 PROXIMITY TO OTHER SERVICES 5.4 ISOLATING VALVES 5.5 LOCATION AND ACCESS WITHIN AND UNDER BUILDINGS 5.6 METHODS OF JOINTING 5.7 SUPPORT AND FIXING ABOVE GROUND 5.8 STANDPIPES 30 30 30 31 31 33 35 36 AS/NZS 3500.1.2:1998 Page Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited 5.9 5.10 5.11 5.12 5.13 5.14 5.15 5.16 5.17 5.18 5.19 5.20 5.21 5.22 ANCHORAGE BELOW GROUND DEPTH OF COVER IN PUBLIC AREAS DEPTH OF COVER IN PRIVATE AREAS BEDDING AND BACKFILL CONTAMINATED AREAS CORROSIVE AREAS WATER-CHARGED OR FILLED GROUND OPEN CHANNELS OR WATERCOURSES PRIVATE EASEMENTS DRY SERVICES FROST PROTECTION GENERAL PRECAUTIONS FOR PLASTICS PIPES AND FITTINGS IDENTIFICATION THERMOSTATIC MIXING VALVES 37 37 37 39 40 40 40 40 40 40 41 42 42 42 SECTION 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 6.7 HOSE REELS 6.8 FIRE SPRINKLER SERVICES 6.9 WINDOW OR WALL DRENCHER SPRINKLER SYSTEM 6.10 WATER STORAGE TANKS 6.11 PRESSURE REDUCTION 6.12 PUMPS 6.13 IDENTIFICATION 43 43 43 43 43 43 43 43 43 44 44 44 44 SECTION IRRIGATION AND LAWN-WATERING SYSTEMS 7.1 SCOPE OF SECTION 7.2 SYSTEM TYPES 7.3 BACKFLOW PROTECTION REQUIREMENTS 7.4 MATERIALS 45 45 45 45 SECTION WATER STORAGE TANKS 8.1 SCOPE OF SECTION 8.2 PURPOSE OF TANKS 8.3 TANK MATERIALS 8.4 INSTALLATION 8.5 TANK DESIGN 8.6 CAPACITY OF STORAGE TANKS 8.7 INLET PIPING 8.8 OUTLET PIPING 8.9 SLUDGE VALVES 8.10 FIRE SERVICES TANKS 8.11 MARKING OF TANKS 51 51 51 51 52 57 58 58 58 58 58 AS/NZS 3500.1.2:1998 Page SECTION WATER FOR SANITARY FLUSHING 9.1 SCOPE OF SECTION 59 9.2 GENERAL 59 9.3 FLUSHING REQUIREMENTS 59 9.4 URINALS 59 9.5 INSTALLATION OF CISTERNS 60 9.6 FLUSH VALVES SUPPLIED FROM BREAK TANKS 60 9.7 FLUSH PIPES AND WATER FLOW DISTRIBUTION 61 9.8 PRESSURE RATIO VALVES 61 9.9 FLUSH VALVES CONNECTED TO THE POTABLE WATER SERVICE 62 Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited SECTION 10 PUMPS 10.1 SCOPE OF SECTION 10.2 GENERAL 10.3 CONTROL OF PUMPS 10.4 INSTALLATION OF PUMPS 10.5 BOOSTER PUMPS SECTION 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 65 65 65 65 66 66 66 66 66 66 66 SECTION 13 TESTING AND COMMISSIONING 13.1 SCOPE OF SECTION 13.2 TESTING 13.3 CLEANING AND DISINFECTION OF STORAGE TANKS 13.4 DISINFECTION OF WATER SERVICES 13.5 COMMISSIONING 67 67 67 67 67 APPENDICES A REFERENCED DOCUMENTS B SIZING METHOD FOR SUPPLY PIPING FOR DWELLINGS C SIZING OF PIPING FOR DWELLINGS D EXAMPLES OF POTENTIAL CROSS-CONNECTIONS E TYPES OF BACKFLOW PROTECTION F STORAGE TANKS—INFLOW AND OVERFLOW G CLEANING AND DISINFECTION OF STORAGE TANKS H DISINFECTION OF WATER SERVICES 68 71 78 81 83 92 94 95 SECTION 12 INSTALLATION OF WATER METERS 12.1 SCOPE OF SECTION 12.2 LOCATION OF WATER METERS 12.3 INSTALLATION OF WATER METERS 12.4 PROTECTION 12.5 ELECTRICAL SAFETY PRECAUTIONS 12.6 SUPPORT 12.7 FROST PROTECTION 64 64 64 64 64 AS/NZS 3500.1.2:1998 FOREWORD Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited REGULATORY REQUIREMENTS Attention is drawn to the relevant regulatory requirements with respect to— (a) the qualifications of persons permitted by law to plumbing work; (b) the administrative procedures to be followed by persons performing plumbing work; and (c) the authorization for certain materials, products, fittings, and other components to be connected to water supply systems in accordance with the National Certification of Plumbing and Drainage Products Scheme (NCPDP) in Australia and the Building Industry Authority (BIA) in New Zealand RULINGS AND INTERPRETATIONS Enquires concerning the interpretation of specific Clauses contained in AS/NZS 3500.1.2 should be directed initially to the regulatory authority responsible for the locality within which work is, or is to be, conducted In the event that further clarification is required, the enquiry may be directed to Committee WS/14, which is responsible for the Joint Australian/New Zealand National Plumbing and Drainage Code The Projects Manager, Committee WS/14, Standards Australia will process enquires and issue replies PROVISION FOR REVISION This Standard necessarily deals with existing conditions, but is not intended to discourage innovation or to exclude materials, equipment and methods which may be developed in future Revisions will be made from time to time in view of such developments and amendments to this edition will be made only when absolutely necessary AS/NZS 3500.1.2:1998 STANDARDS AUSTRALIA / STANDARDS NEW ZEALAND Australian/New Zealand Standard National plumbing and drainage Part 1.2: Water supply —Acceptable solutions S E C T I O N S CO P E A N D G E NE R A L 1.1 SCOPE This Standard sets out the requirements for the installation of water services from the authority’s water main or alternative potable water supplies to the points of discharge This Standard applies to new installations as well as alterations, additions and repairs to existing installations Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited Illustrations used in this Standard are diagrammatic only and have been chosen without prejudice Construction of a water supply installation in accordance with this Standard is deemed to satisfy the requirements of AS 3500.1.1 for Australia This Standard may be used as an alternative acceptable solution to Clause G12 of the New Zealand Building Code but may exceed the performance requirements NOTE: The requirements for hot water services are set out in AS/NZS 3500.4.2 1.2 REFERENCED DOCUMENTS A list of the documents referred to in this Standard, is given in Appendix A 1.3 DEFINITIONS For the purpose of this Standard the definitions AS/NZS 3500.0 and those below apply given in 1.3.1 Deemed to satisfy— where a provision states that the use of a particular material, component, method of construction or design satisfies a performance requirement of this Standard An equivalent material, component, method or design may be used if it meets the level of performance prescribed by the provisions concerned 1.3.2 Registered break tank— a break tank which is recorded by an authority or third party for the purpose of inspection and maintenance to ensure its functional requirements 1.4 CLASSIFICATION OF SOILS AS 1726 or NZS 4402 Soils shall be classified in accordance with 1.5 EQUIVALENT PIPE SIZES Where the nominal size of a pipe is specified in this Standard, an equivalent pipe size, appropriate to the material being used, shall be selected from Table 1.1 for Australian requirements or Table 1.2 for New Zealand As an alternative, Table 1.3 may apply to the selection of tubes for use in either country 1.6 REQUIREMENTS FOR DISABLED PERSONS Facilities for disabled persons shall comply with the requirements of AS 1428.1 and the Australian Building Code or NZS 4121 and the New Zealand Building Code where applicable COPYRIGHT 81 AS/NZS 3500.1.2:1998 APPENDIX D EXAMPLES OF POTENTIAL CROSS-CONNECTIONS (Informative) Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited D1 SCOPE This Appendix gives some examples of installations in which crossconnections are likely to be encountered The methods of cross-connection control are given in Section D2 POTENTIAL CROSS-CONNECTIONS Some examples of installations in which cross-connections are likely to occur are as follows: (a) Agricultural and horticultural properties Market gardens, poultry farms, and dairy farms, the interconnection between water service and dam water, drinking nipples, fogging sprays, irrigation pipes, antibiotic injectors, cleansing injectors, vertical sprays for vehicle washing, or any submerged outlet or hose at tanks or feed troughs (b) Catering and allied trade installations Commercial kitchens, hotels, and clubs, the interconnection between the water service and water cooled refrigerant units containing methylchloride gas, or any submerged outlets or hoses that connect to glass and dishwashers, bain-maries, food waste disposal units, garbage can washers, ice-making machines, refrigerators, hoses when supplying water to sinks or other receptacles (c) Domestic installation Interconnection of the water service to a haemodialysis machine, bidet, water-operated venturi type ejectors attached to garden hoses where used to empty or clean out sullage pits, septic tanks, gullies, stormwater sumps, domestic grease traps, or any submerged outlets, or discharge point of the water service in sanitary flushing cisterns, garden hoses supplying water to swimming pools, ornamental ponds, fish ponds, hose taps below the flood level rim of any fixture, or located below ground surface level (d) Health and sanitary services installations These installations include the following: (i) Council sanitary depots Interconnection between the water service and sanitary pan washers, truck washers, and pan-dumping machines (ii) Dental surgeries Any submerged outlets of water service connected to chair bowls and venturi type water aspirators (iii) Funeral parlours In embalming areas the interconnection between the water service and water-operated aspirator pumps (iv) Hospitals and nursing homes Submerged outlets of the water service at bed pan washers, bed bottle washers, sterilizers, steam autoclaves, instrument washers, and any interconnection between the water service and steam pipes, steam boilers, or steam calorifiers (v) Mortuaries Post-mortem areas, submerged water service outlets at autopsy tables, flushing rim floor gullies, specimen tables, and instrument washing sinks (e) Industrial and commercial installations These installations include the following: (i) Tanks Any submerged discharge point of hoses or pipes that supply water to rinse tanks, process tanks and other tanks (ii) Abattoirs Interconnection between the water service and steam pipes, steam boilers, or steam calorifiers, and the washing sprays in contact with animal carcases COPYRIGHT AS/NZS 3500.1.2:1998 (iii) (iv) (v) (vi) (vii) (viii) 82 Bleaching works Interconnection between the water service and steam pipes, steam boilers, steam calorifiers, or any submerged outlets at revolving drum washers, or any pipes conveying non-potable water Breweries, cordial and soft drink plants Interconnection between water service and the contents of gas cylinders, steam pipes, steam boilers, or steam calorifiers, or any submerged water service outlets at drum or bottle washers, process tanks Butchers’ shops Interconnection between the water service and any watercooled refrigerant units containing methyl-chloride gas, or water-powered food processing machines Chemical plants Interconnection between the water service and chemical pipe lines, or the submerged water service pipe outlets at drum washer and process tanks Dry cleaners Interconnection between the water service and solvent stills Dyeing works Interconnection between the water service pipes and steam pipes, foul water inlet sprays in process tanks, and any submerged water service pipe outlets at vats, tanks, and colanders Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited (ix) Engineering works Interconnection between the water service and any steam boilers, diesel oil recirculating systems, recirculated cooling water for machines, testing pressure vessels, oil cooling coils, pump priming, compressed air pipe lines, and venturi type ejectors in vehicle maintenance pits (x) Laboratories Interconnection between the water service and any aspirator pumps, fume cupboards, stills, centrifuges, blood testing machines, air scrubbers, test-tube washing machines, animal feeding troughs, and high pressure gas cylinders (xi) Laundries Interconnection between the water service and any clothes washing machines, starch tanks, soap mixing vats, and recirculated hot water tanks (xii) Milk processing plants Interconnection between the water service and any steam pipes, steam boilers, steam calorifiers, or any submerged outlets at bottle washing machines, milk can washing machines, and process chilling tanks (xiii) Oil storage depots Interconnection between the water service and foam firefighting equipment (xiv) Poultry processing plants Interconnection between the water service and any steam pipes, steam boilers, steam calorifiers, or any submerged outlets at feather-plucking machines, carcass-washing machines, offal boilers, and process tanks (xv) Photographic developers Interconnection between the water service and Xray equipment, or any submerged outlets at tanks and rinse machines (xvi) Plating workings Interconnection between the water service and solvent, acid or alkaline tanks, cooling coils, steam pipes, or any submerged outlets at tanks and rinse machines (xvii) Tanneries Interconnection between the water service and vats, drum process tanks, or steam pipes (xviii) Wool processors Interconnection between the water service and lanolin centrifuges and head recycling coils, or any submerged outlets or hoses at vats, drums, and tanks COPYRIGHT 83 AS/NZS 3500.1.2:1998 APPENDIX E TYPES OF BACKFLOW PROTECTION (Informative) E1 GENERAL This Appendix gives examples in Tables E1 to E3 for individual, zone and containment protection together with hazard ratings and device selection Although this Appendix is informative it is recommended these procedures be adopted to contain the risk levels required for backflow protection Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited Figures E1 to E7 give typical installation examples for testable and non-testable backflow prevention devices COPYRIGHT AS/NZS 3500.1.2:1998 84 TABLE E1 INDIVIDUAL PROTECTION HAZARD RATINGS AND A SELECTION OF BACKFLOW PREVENTION DEVICES FOR BACKFLOW PREVENTION PROTECTION AT INDIVIDUAL FIXTURES, APPLIANCES OR APPARATUS Hazard rati ng Form of cross-connection Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited AGRICULTURAL AND HORTICULTURAL Anti biotic injectors Fert il izers, herbicides, nematicides, insecti cides and weedicides injected into an ir ri gator (see Secti on 7, Type D) Fogging and cleaning sprays wit h chemical injecti on INDUSTRIAL AND COMMERCIAL Fogging and cleaning spray equipment with chemical injection or addit ives Pan washing apparatus Chemical dispensers (high toxicity) Weed and pest spraying and water cartage tanks Mixing of chemicals Port able and mobil e tankers Chemical dispensers (low toxicit y) Coil s and jackets in heat exchangers— unsealed and toxic environment Coil s and jackets in heat exchangers— sealed and non-t oxic envir onments Photographic processing machines (no developer mixing) HOSPITALS — MEDICAL Equipment used for handli ng, mixing, measuri ng and processing chemical and microbiological substances Photographic developers (a) Developer mixing facili ti es (b) Water supplying rinse tanks Dental console Haemodialysis machines NOTE: Veterinary equipment is rated as for Hospital— Medical FIXTURES AND APPLIANCES Bidet Food preparati on or food storage tanks, vats and vessels wit h clean-i n-place systems Fixtures used for food preparation, e.g sinks Fixtures used for abluti ons, e.g baths, bidett es, basins, showers Laundry tr oughs Hair salons basins or troughs Carbonated dri nk dispensing machines Drink-dispensing equipment, vending machines, coffee machines Food preparati on or food storage tanks, vats and vessels HOSE ATTACHMENT OUTLETS (a) External hose taps (b) Flexible connecti ons over domesti c fi xtures (c) Hose taps located wit hin an area provided wit h zone protecti on, but not connected downstream of the zone protection device (i ) fl exible connections over commercial, industr ial or hospit al fi xtures (i i) laboratory outl ets (d) Hose taps located wit hin 18 m of a Type C irr igation system WATER SUPPLY SYSTEMS PERMANENTLY ATTACHED Steam boil ers Cooling towers* Steam calori fi er High RBT or RPZD High High RBT or RPZD RBT or RPZD High High High High High High Medium Medium Low Low RBT or RPZD RBT or RPZD RAG, RBT or RPZD RAG or RPZD (see Figure E1) RAG or RPZD RAG or RPZD (see Figure E1) Testable device DCV only Non-testable device Non-testable device High RAG or RPZD High Low Low Low RAG or RPZD Non-testable device VDCV Non-testable device High RBT or RPZD High Low Low Low Low Low Low Low RAG or RPZD AG AG AG Non-testable device Stainless steel dual CV (i ntermediate) vent Non-testable device AG/non-t estable device Low Low Non-testable device Non-testable device Low Low Low Non-testable device Non-testable device Non-testable device Low High Medium BT RAG or RPZD Testable device * Cooli ng tower air gap should be measured from the rim of the cooli ng tower basin COPYRIGHT Backfl ow preventi on device (continued ) 85 AS/NZS 3500.1.2:1998 TABLE E1 (continued ) Hazard rati ng Form of cross-connection WATER TREATMENT SYSTEMS Deminerali zing equipment using ion-exchange resins with acid and alkali regenerati on Plants with auxili ary-non-potable water supplies Potable water in reclaimed water plants Chlori nators In-l ine water softeners and fil ters air gap break tank double-check valve registered air gap registered break tank reduced pressure zone device Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited LEGEND: AG = BT = DCV = RAG = RBT = RPZD = COPYRIGHT High High Low Medium Low Backfl ow preventi on device RBT or RPZD RBT or RPZD Non-testable device Testable device Non-testable device AS/NZS 3500.1.2:1998 86 TABLE E2 ZONE PROTECTION HAZARD RATINGS AND A SELECTION OF BACKFLOW PREVENTION DEVICES FOR BACKFLOW PREVENTION PROTECTION AT THE CONNECTION TO SPECIFIED SECTIONS OF A WATER SUPPLY SYSTEM WITHIN A BUILDING OR FACILITY Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited Form of cross-connection Hazard rati ng Backfl ow preventi on device AG R IC CUL T UR AL , H HOR T IC UL TU R AL A AND IR R IG GAT IO N SY S TE MS Ir ri gati on systems injected wit h ferti li zers, herbicides, nematicides and insecticides (see Section 7, Type D) Drinking nipples and troughs High High Ir ri gati on systems (see Secti on 7, Type C) Ir ri gati on systems (see Secti on 7, Type B) Medium Low RBT or RPZD RAG or RBT or RPZD Testable device Non-testable device High High High RBT or RPZD RAG or RPZD RAG or RPZD High High High High Medium Medium Low Low RAG or RPZD RAG or RPZD RAG or RPZD RAG or RPZD Testable device Testable device Non-testable device Non-testable device Medium Single-check valve (Aust only) resili ent seated (see Clause 4.6.3.3 It em (h)( ii i) DCV Medium Low DCV AG HOSPITALS — MEDICAL LABORATORIES, NURSING HOMES Dissecti ng rooms in hospit als and medical buil dings Mort uary equipment used in funeral parl ours, mortuaries, autopsy areas Util it y rooms, where other than handbasins are installed Operating theatr es in hospitals and medical buildings Dental and medical surgeri es High High High Medium Low RBT or RPZD RBT or RPZD RBT or RPZD Testable device VDCV FIXTURES AND APPLIANCES Sanitary dump points Food storage tanks, vats and vessels wit h Clean-i n-place systems Food storage tanks, vats and vessels Hair salons, basins or tr oughs High High Low Low RAG or RPZD RAG or RPZD Non-testable device Non-testable device INDUSTRIAL AND COMMERCIAL Electr o-plating, degreasing, descaling, str ipping, pickling, dipping, etc., tanks, vats and vessels Commercial laundries Cooling or heating systems wit h recirculating water Clean-in-place systems (i.e internal chemical cleaning takes place wit hout dismantl ing equipment Dockside facil it ies Industri al process water which has been recir culated Industri al and teaching laboratori es Aircraft facili ti es Secondary school laboratories (including fume cupboards) Water fi lt rati on equipment Photographic laboratories FIRE SERVICES (a) Direct connecti on to publi c water supply only No tank, reservoir, connection to other water supply, anti fr eeze or other additi ves or auxili ary supply, e.g pond or lake wit hin 180 m of fir e brigade booster connecti on (b) Fire hose reels, where there is a possibili ty of being used for purposes other than fi re fi ghti ng (c) All other fir e services (d) Fire storage tank COPYRIGHT 87 TABLE AS/NZS 3500.1.2:1998 E3 CONTAINMENT PROTECTION — HAZARD RATINGS AND A SELECTION OF BACKFLOW PREVENTION DEVICES BACKFLOW PREVENTION PROTECTION PROVIDED AT THE PROPERTY BOUNDARY TO PROTECT THE NETWORK UTILITY’S OR MAINS WATER SUPPLY FROM CONTAMINATION Ha z a r d r a tin ing Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited Fo rm oof c roos s -co co n n e c tio ion TYPE OF PREMISES Premises wit h an alternative water supply * Premises where inspection is restri cted Hospit als, mortuaries, clinics and the li ke Piers, docks and other waterfr ont facili ti es Sewage tr eatment plants and sewage li ft stati ons Chemical plants Metal fi nishing plants Petr oleum processing or storage plants Radioactive materi al processing plants or nuclear reactors Car and plant washing facil it ies Abattoir s Factories using, processing or manufacturi ng toxic chemicals Chemical laboratories Pathology laboratori es Sanitary depots Universiti es Food and beverage processing plants Caravan parks Mari nas Premises wit h grey water re-use systems Public swimming pools Premises wit h reti culated and disinfected reclaimed water systems Premises wit h rainwater tanks * Rain or river water can be potable NOTES: Properti es with alternative water supply (see Clause 4.2.5) Air gaps should not be used in toxic envir onments LEGEND: AG = air gap AVB = atmospheri c vacuum breaker DCV = double-check valve RAG = registered air gap RBT = registered break tank RPZD = reduced pressure zone device COPYRIGHT High High High High High High High High High High High High High High High High Medium Medium Medium Medium Medium Medium Low Ba ck flloow p r e v enntioon d evvicee RBT or RPZD RBT or RPZD RBT or RPZD RBT or RPZD RBT or RPZD RBT or RPZD RBT or RPZD RBT or RPZD RBT or RPZD RBT or RPZD RBT or RPZD RBT or RPZD RBT or RPZD RBT or RPZD RBT or RPZD RBT or RPZD Testable device Testable device Testable device Testable device Testable device Testable device Non-testable device Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited AS/NZS 3500.1.2:1998 FIGURE E1 88 TYPICAL MINIMUM PROTECTION FOR FILLING TANKER TRUCKS COPYRIGHT Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited 89 FIGURE E2 FIGURE E3 AS/NZS 3500.1.2:1998 TYPICAL INSTALLATION OF AN ATMOSPHERIC VACUUM BREAKER TYPICAL INSTALLATION OF A PRESSURE TYPE VACUUM BREAKER COPYRIGHT Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited AS/NZS 3500.1.2:1998 FIGURE E4 90 TYPICAL INSTALLATIONS OF EXTERNAL HOSE CONNECTION VACUUM BREAKERS FIGURE E5 TYPICAL INSTALLATION OF A DUAL-CHECK VALVE WITH ATMOSPHERIC PORT COPYRIGHT 91 Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited FIGURE E6 FIGURE E7 AS/NZS 3500.1.2:1998 TYPICAL INSTALLATION OF A DOUBLE-CHECK VALVE TYPICAL INSTALLATION OF A REDUCED PRESSURE ZONE DEVICE COPYRIGHT AS/NZS 3500.1.2:1998 92 APPENDIX F STORAGE TANKS— INFLOW AND OVERFLOW (Informative) F1 GENERAL This Appendix contains an example of the calculations for inflow rate, overflow size, spill level air gap and height of inlet above invert of overflow for storage tanks F2 INFLOW RATE Inflow rates can be determined from Table 8.1 As an example the inflow rate from a 20 mm orifice, with an inlet pressure of 500 kPa would be 6.0 L/s F3 OVERFLOW SIZE AND SPILLING LEVEL With reference to Figures 8.2, 8.3 or 8.4, depending on the type of overflow, determine the size of overflow and spill level required from the alternative available Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited For this example Figure 8.2 is used Using the inflow rate determined from Paragraph F2 (i.e 6.0 L/s) select combination required The available alternatives are given in Table F1 TABLE F1 SPILL LEVELS Internal diameter of overflow pipe mm Spill level (height of water above invert of overflow), mm 100 125 150 150 125 100 F4 AIR GAP With reference to Table 4.3, the minimum air gap for a 20 mm orifice when not affected by a near wall, is 40 mm (see Figure F1) F5 the the the HEIGHT OF INLET ABOVE INVERT LEVEL OF OVERFLOW The height of float control valve from the invert of the overflow to the underside of the outlet from float control valve is determined by the addition of the spill level (Paragraph F3) and air gap (Paragraph F4) COPYRIGHT Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited 93 FIGURE F1 COPYRIGHT AS/NZS 3500.1.2:1998 DISTANCES RELATED TO OVERFLOW SIZE, SPILL LEVEL AND AIR GAP AS/NZS 3500.1.2:1998 94 APPENDIX G CLEANING AND DISINFECTION OF STORAGE TANKS (Normative) G1 GENERAL All water storage tanks for potable water shall be cleaned and disinfected— (a) prior to initial use; and (b) whenever the tank is taken out of service for inspection, repairs, painting or other activity that might lead to contamination of water Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited G2 CLEANING The tank shall be drained and all debris and sludge removed The surfaces of walls, floor and operating facilities shall be thoroughly cleaned using a high pressure water jet, sweeping, scrubbing or other similar effective means All water, dirt, and other material accumulated in this cleaning process shall be flushed or otherwise removed from the tank G3 DISINFECTION After cleaning, the tank shall be disinfected by one of the following means: (a) By filling the tank to overflow level with potable water to which enough chlorine is added to provide a free chlorine residual, in the whole tank of not less than 10 mg/L, at the end of the retention time The retention time shall not be less than h, when the water entering the tank has been chlorinated uniformly by gas-feed equipment or chemical pump, or not less than 24 h, when the storage tank has been filled with water that has been mixed with sodium hypochlorite or calcium hypochlorite within the storage facility The tank shall be drained after disinfection and flushed out with potable water prior to being put back into service (b) By the application of 200 mg/L available chlorine directly to all surfaces of the storage tank The disinfection solution shall remain in contact with the surface for at least 30 The tank surfaces shall then be hosed down and flushed with potable water prior to being put back into service NOTES: The amount of chlorine to be added to obtain 10 mg/L residual after the retention period will depend on the amount of organic material present and the chemical composition of the water As a guide, an initial chlorine dose of 50 mg/L is recommended Amounts of common chlorine, including agents required per 1000 L should be as follows: Chlorine dose, mg/L 50 200 12.5% Sodium hypochlorite solution, mL 400 1600 70% Calcium hypochlorite, g 70 280 Authorities may require chlorinated water to be neutralized before discharging to the environment ANSI/AWWA C652-86 contains details of disinfection methods that may be used together with an Appendix on neutralization of chlorinated water Choice of the method of disinfection used should include consideration of the size of the tank to be disinfected, the availability of materials and disinfection equipment, training of personnel, safety of operation and disposal of chlorinated water COPYRIGHT 95 AS/NZS 3500.1.2:1998 APPENDIX H DISINFECTION OF WATER SERVICES (Normative) H1 GENERAL Water services used to supply potable water shall be protected against contamination during storage, construction and repairs, and be flushed and chlorinated before being placed in service and after any repairs that might lead to contamination of water H2 PRECAUTIONS AGAINST CONTAMINATION Precautions shall be taken to protect the interior of pipes fittings and valves against contamination during storage, construction and repairs (see Note 1, Paragraph H5) Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited H3 FLUSHING OF WATER SERVICES On completion of installation or repairs, water services shall be flushed at each discharge point to remove any dirty water or debris from the service The flushing velocity in any section of the service shall be not less than 0.75 m/s H4 CHLORINATION After flushing, water services from storage tanks shall be chlorinated, before being placed in service, as follows: (a) Water services from storage tanks shall be disinfected by drawing chlorinated water from the storage tank into the service, such that after a retention period of h, a free chlorine residual of not less than 10 mg/L is obtained throughout the services (see Note 2, Paragraph H5) (b) Water services DN 80 or larger, shall be disinfected as for water services from storage tank or in accordance with ANSI/AWWA C651-86 H5 FINAL FLUSHING After the applicable retention period, heavily chlorinated water shall not be allowed to remain in prolonged contact with service piping In order to prevent damage to pipe lining or corrosion to pipe itself, the heavily chlorinated water shall be flushed from the service until chlorine measurements show that the concentration in the water leaving the service is no higher than that generally prevailing in the authority’s distribution system or is acceptable for domestic use NOTES: During construction all openings in pipelines should be covered and when laid in a trench be sealed with watertight plugs during interruption to installation to prevent contamination from water in the trench Water services that are supplied from storage tanks should be disinfected at the same time as that of the disinfection of the storage tank The water service to the tank should be closed The discharge points on the service from the tank then opened, working progressively away from the storage tank until chlorinated water (as detected by odour) is delivered from each discharge point which should then be closed The storage tanks should then be topped up with chlorinated water COPYRIGHT ... 6001 New Zealand ISBN 7337 1687 AS/ NZS 3500.1.2:1998 PREFACE This Standard was prepared by the Joint Standards Australia / Standards New Zealand Committee WS/14, National Plumbing and Drainage Code,... when absolutely necessary 7 AS/ NZS 3500.1.2:1998 STANDARDS AUSTRALIA / STANDARDS NEW ZEALAND Australian/New Zealand Standard National plumbing and drainage Part 1.2: Water supply —Acceptable solutions... Zealand Standard National plumbing and drainage Part 1.2: Water supply— Acceptable solutions Originated in Australia as AS 3500.1— 1990 Final Australian edition AS 3500.1— 1992 Jointly revised and