Manual of Mainlaying Practice

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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 NewMains133 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 6 and 7: List of Appendices1.1 Guideline for
Page 8 and 9: SECTION 1 - DESIGN1.1 Standard Size
Page 10 and 11: - 3 -installed with fire hydrants,
Page 12 and 13: - 5 -installed at the entry point n
Page 14 and 15: - 7 -provided to facilitate pumping
Page 16 and 17: - 9 -Buried flowmeters should only
Page 18 and 19: - 11 -SECTION 2 - MATERIALS2.1 Spec
Page 20: - 13 -(c) Mechanical joint fittings
Page 23 and 24: - 16 -http://www.emsd.gov.hk/emsd/e
Page 25 and 26: - 18 -Where the works is carried ou
Page 27 and 28: - 20 -3.5 Laying PipesA number of g
Page 30 and 31: - 23 -(iii)For Polyethylene PipesPE
Page 32 and 33: - 25 -The leakage should not exceed
Page 34 and 35: - 27 -(where the pipe-to-soil poten
Page 36 and 37: - 29 -RecordNewly-laid, Diverted,Re
Page 38 and 39: - 31 -4.2 Leak DetectionApart from
Page 40 and 41: - 33 -A semi-structural lining syst
Page 42 and 43: - 35 -epoxy/polyurethane coating. P
Page 44 and 45: - 37 -pipe by winching.Step 6: Inse
Page 46 and 47: - 39 -Then carry out the hydrostati
Page 48 and 49: - 41 -collar will be in close conta
Page 50 and 51: - 43 -the lining, if needed. Connec
Page 52 and 53:
- 45 -External FRP Layer WrapStep 1
Page 54 and 55:
- 47 -SlipliningStep 1: Preparatory
Page 56 and 57:
Appendix 1.1Sheet 1 of 6JOINT UTIIL
Page 58 and 59:
Appendix 1.1Sheet 3 of 6c) As storm
Page 60 and 61:
Appendix 1.1Sheet 5 of 6e) When the
Page 98 and 99:
Appendix 3.2M E M OFrom E/C To E/Re
Page 100 and 101:
Appendix 3.3Sheet 2 of 7ItemItem De
Page 102 and 103:
Appendix 3.3Sheet 4 of 7ItemItem De
Page 104 and 105:
Appendix 3.3Sheet 6 of 7(C) Unmappe
Page 112:
WATER SUPPLIES DEPARTMENTNotificati
Page 116:
Appendix 4.2Sheet 2 of 2Type ofReha
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Manual of Mainlaying Practice

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