Page 9 - Trenchless Technology Piping Installation and Inspection

viii Co n t e n t s

2.3 Applicability of Trenchless Renewal and
Replacement Methods . . . . . . . . . . . . . . . . . . . . 51
2.3.1 Cured-in-Place Pipe . . . . . . . . . . . . . . . 53
2.3.2 Sliplining . . . . . . . . . . . . . . . . . . . . . . . . 53
2.3.3 Modified Sliplining . . . . . . . . . . . . . . . 57

2.3.4 Coatings and Linings . . . . . . . . . . . . . . 58
2.3.5 Close-Fit Pipe . . . . . . . . . . . . . . . . . . . . 60
2.3.6 Thermoformed Pipe . . . . . . . . . . . . . . . 60
2.3.7 Lateral Renewal . . . . . . . . . . . . . . . . . . 61
2.3.8 Point Source Repair or Localized
Repairs . . . . . . . . . . . . . . . . . . . . . . . . . . 62
2.3.9 Trenchless Replacement Methods . . . 63
2.4 Sample Decision Support Systems for
Gravity and Pressure Pipes . . . . . . . . . . . . . . . 64
2.5 Emerging Design Concepts for
Pipeline Renewal Systems . . . . . . . . . . . . . . . . 67
2.5.1 Long-Term Testing . . . . . . . . . . . . . . . . 67
2.6 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
2.7 Sample Design Calculations for CIPP . . . . . . . 69
2.8 Sample Specifications for CIPP . . . . . . . . . . . . 83

3 Spray-on Coatings and Linings for Renewal
of Potable Water Pipe Distributions . . . . . . . . . . . . 93
3.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
3.2 Water Distribution Pipe Applications . . . . . . . 95
3.3 Selecting a Water Pipe Renewal Method . . . . 96
3.4 Installation Phases of Coatings and Linings . . . 97
3.5 Planning and Site Investigations . . . . . . . . . . . 98
3.6 Pipe Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . 98
3.6.1 Objectives of Prelining Inspections . . . 99
3.7 Pipe Cleaning Methods . . . . . . . . . . . . . . . . . . . 99
3.8 Installation Considerations . . . . . . . . . . . . . . . . 101
3.9 Disinfection Methods . . . . . . . . . . . . . . . . . . . . 101
3.9.1 Tablet Method . . . . . . . . . . . . . . . . . . . . 101
3.9.2 Continuous Feed Method . . . . . . . . . . 101
3.9.3 Slug Method . . . . . . . . . . . . . . . . . . . . . 101
3.9.4 Ozonation . . . . . . . . . . . . . . . . . . . . . . . 102
3.9.5 U.K. Method . . . . . . . . . . . . . . . . . . . . . 102
3.10 Pipe Sample Testing . . . . . . . . . . . . . . . . . . . . . . 102
3.11 Quality Control . . . . . . . . . . . . . . . . . . . . . . . . . . 102
3.12 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
3.13 Reconnecting Appurtenances . . . . . . . . . . . . . 105
3.14 Surface Restoration and Site Clearing . . . . . . 105
3.15 Waste Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . 106