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CONTENTSSectionPage No.1 DESIGN 11.1 Standard Size, Type and Class of Pipes 11.2 Design Criteria 21.3 Operational Requirements 52 MATERIALS 112.1 Specification 112.2 Steel Pipes and Fittings 112.3 Ductile Iron (DI) Pipes and Fittings 122.4 Polyethylene (PE) Pipes and Fittings 122.5 Galvanised Iron (GI) Pipes and Fittings 132.6 Other Pipe Materials No Longer Used by WSD for New 13Mains3 INSTALLATION 153.1 Preparation Work for Trench Excavation 153.2 Excavation in Trenches 153.3 Safety of Road Opening for Mainlaying Works 173.4 Cover to Mains 183.5 Laying Pipes 203.6 Thrust Blocks 213.7 Transverse Anchor Blocks 233.8 Nitrogen Gas Test for Steel Pipes 233.9 Backfilling 233.10 Hydrostatic Pressure Test 243.11 Cleaning and Sterilisation of Fresh Water Mains 25
SectionPage No.3.12 Cathodic Protection of Water Mains 263.13 Service Connections and Integrating New and ExistingDistribution System273.14 Fire Hydrants 283.15 As-built Records of Water Mains 284 REPAIR, REHABILITATION, OPERATION ANDMAINTENANCE OF WATER MAINS304.1 Repairs to Mains and Submains 304.2 Leak Detection 314.3 Draining of Mains Through Washout Valves 314.4 Rehabilitation of Water Mains 31
Page 2: [ This page is intentionally left b
Page 7 and 8: List of Appendices4.4 Schematic Arr
Page 9 and 10: - 2 -EquivalentEquivalentNominalNom
Page 11 and 12: - 4 practicable and aesthetically
Page 13 and 14: - 6 with a built-in by-pass. In s
Page 15 and 16: - 8 leaks and bursts in the distr
Page 17 and 18: - 10 1.3.13 Contact Points for Le
Page 19 and 20: - 12 joints and collars, Appendix
Page 21 and 22: - 14 -than 127 m headFor connecting
Page 23 and 24: - 16 http://www.emsd.gov.hk/emsd/
Page 25 and 26: - 18 -Where the works is carried ou
Page 27 and 28: - 20 3.5 Laying PipesA number of
Page 29 and 30: - 22 pipe arising from the intern
Page 31 and 32: - 24 Backfilling involves two ope
Page 33 and 34: - 26 and chemical analyses. The p
Page 35 and 36: - 28 3.14 Fire HydrantsThe locati
Page 37 and 38: - 30 SECTION 4 - REPAIR, REHABILI
Page 39 and 40: - 32 of the proposed water main,
Page 41 and 42: - 34 (iii)“Sliplining” is def
Page 43 and 44: - 36 The advantages and disadvant
Page 45 and 46: - 38 again as necessary to confir
Page 47 and 48: - 40 Step 7: Post-lining CCTV Sur
Page 49 and 50: - 42 Step 6: Hydrostatic Pressure
Page 51 and 52: - 44 pipe is ductile or brittle)
Page 53 and 54:
- 46 [Remark: The exposed lining
Page 55 and 56:
- 48 existing lining so that stra
Page 57 and 58:
Appendix 1.1Sheet 2 of 6normal circ
Page 59 and 60:
Appendix 1.1Sheet 4 of 6b) If the m
Page 61:
Appendix 1.1Sheet 6 of 6Figure 4 (a
Page 99 and 100:
Appendix 3.3Sheet 1 of 7Guidelines
Page 101 and 102:
Appendix 3.3Sheet 3 of 7ItemItem De
Page 103 and 104:
Appendix 3.3Sheet 5 of 7FromTo: [Pr
Page 105:
Appendix 3.3Sheet 7 of 7(E) Suspici
Page 115 and 116:
Appendix 4.2Sheet 1 of 2Advantages
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