Transcript PJFogarty.
Water Services Training Group
14 th Annual Conference
New Decade – New Challenges
9 th September 2010
New Decade - New Challenges Annual Conference September 2010
Trenchless Watermain Rehabilitation Techniques
Padraic J Fogarty Director
New Decade - New Challenges Annual Conference September 2010
Outline of Presentation
Introduction Rehabilitation Techniques Review of Rehabilitation Techniques Other Issues Conclusions
New Decade - New Challenges Annual Conference September 2010
New Decade - New Challenges Annual Conference September 2010
Introduction
The Good News
Water Services Investment Programme (WSIP) 2010 to 2012 Contracts with a total value of €321 million to commence construction in the period 2010 to 2012. 90% Funding WSIP 2010-2012 the Start!
New Decade - New Challenges Annual Conference September 2010
Mains Rehabilitation Strategy
Starting Point Identifies Mains for Rehabilitation Reasons for Rehabilitation Pipe Materials
New Decade - New Challenges Annual Conference September 2010
Objectives
Bang for Buck (More for Less) Selection of Mains Selection of Techniques Quality Installation Water Quality - Drinking Water Regulations Health" “Protect Human Watertightness - Reducing UFW Robust and Durable Installation Minimise Impact Interruption to Supply Traffic and Access Environmental – drilling fluids etc.
Nuisance - dust, noise etc.
Sustainable Construction
New Decade - New Challenges Annual Conference September 2010
Terms and Abbreviations
Rehabilitation – All methods for restoring or upgrading the performance of an existing pipeline system Replacement – Methods of rehabilitation of an existing pipeline system by the installation of a new system, either on or off the existing line, without incorporating the original fabric Host Pipe – Existing pipe/mains to be rehabilitated Spray in Place Pipe (SIPP) Cured in Place Pipe (CIPP) Horizontal Directional Drilling (HDD)
New Decade - New Challenges Annual Conference September 2010
Rehabilitation Techniques
New Decade - New Challenges Annual Conference September 2010
Slide with photo or graph
New Decade - New Challenges Annual Conference September 2010
Structural Rehabilitation
Cured in Place Pipe (CIPP) Close Fit Sliplining Diameter Reduction Rolldown Sliplining Pipe Bursting/Pipe Splitting Horizontal Directional Drilling
New Decade - New Challenges Annual Conference September 2010
Non Structural & Semi Structural Rehabilitation Internal Joint Seals Spray in Place Pipe (SIPP) Cement Mortar Lining Epoxy Lining Cured in Place Pipe (CIPP) Close Fit Sliplining Diameter Reduction Rolldown
New Decade - New Challenges Annual Conference September 2010
Spray in Place Pipe - Epoxy
Thorough cleaning of host pipe Spray host pipe with a thin lining of resin (typically 1mm thick) Advantages: Minimal excavation Disadvantage: Requires a completely clean and dry host pipe
New Decade - New Challenges Annual Conference September 2010
Cured in Place Pipe
Fabric tube impregnated with thermosetting resin Inserted in host pipe and heat cured – 2 Methods Pulled into host pipe and expanded by water pressure Liner turned inside out (Inversion) Advantages: Service connections can be reinstated by robotic cutters Disadvantage: Requires extensive pre-investigation
New Decade - New Challenges Annual Conference September 2010
Close Fit Sliplining – Diameter Reduction New pipe temporarily deformed Two methods Swaging Compression Rollers Advantages: Limited loss of pipe diameter Disadvantage: Difficult to install if irregularities in host pipe
New Decade - New Challenges Annual Conference September 2010
Close Fit Sliplining – Rolldown
Liner is heated and folded Liner is winched into host pipe and reshaped by heat and pressure Advantages: Limited loss of pipe diameter and accommodates bends Disadvantage: Reversion process may be difficult
New Decade - New Challenges Annual Conference September 2010
Sliplining
HPPE pipe is pulled into host pipe Advantages: Not reliant on integrity of host pipe Disadvantages: Reduction in pipe diameter (but maybe not in capacity)
New Decade - New Challenges Annual Conference September 2010
Pipe Bursting/Pipe Splitting
HPPE pipe is attached to bursting head Break and displace host pipe Pull replacement pipe into the void Advantages: No cleaning required; facilitates upsizing Disadvantage: Difficult in some situations; not suitable for Asbestos Cement mains
New Decade - New Challenges Annual Conference September 2010
Pipe Bursting - Execution
New Decade - New Challenges Annual Conference September 2010
Horizontal Directional Drilling
Pilot bore to line and grade Reamer and new HPPE pipe pulled through in reverse direction Advantages: Less disruption compared to open cut; existing supplies not cut-off Disadvantage: Depends on suitable soil conditions and corridor free from existing services
New Decade - New Challenges Annual Conference September 2010
Review of Rehabilitation Techniques
New Decade - New Challenges Annual Conference September 2010
Selecting Appropriate Technique (1) Flow Chart for Selecting the Rehabilitation Technology Replacement/Structural Rehabilitation Non-Structural and Semi Structural Rehabilitation Scale of Contract Is it large enough to justify use of specialist equipment? Availability of specialist contractors and equipment or option for knowledge transfer to local contractors
New Decade - New Challenges Annual Conference September 2010
Selecting Appropriate Technique (2) Suitability of materials Suitability for contact with water Physical properties (expansion and contraction) Density of connections If more than 20 connections per 100m it may be more economical to open cut
New Decade - New Challenges Annual Conference September 2010
Sustainable Construction
Carbon Footprint Open Cut C Directional Drilling B Waste C B C B Local & Sustainable Materials Ecology Archaeology Health & Safety C C B B B/C A Other No Dig A A B A A A
New Decade - New Challenges Annual Conference September 2010
Main Options
Pipe Bursting Dependent on suitable site conditions Horizontal Directional Drilling Rural/Semi Urban Independent of Connections Cured in Place Pipe?
New Decade - New Challenges Annual Conference September 2010
Case Study: Arva, Co.Cavan
Contract Details: Start Date: 8 th June, 2010 Contract Period: 15 weeks Scope of Works 0.8km directional drilling of 180mm HPPE 4.2km pipe bursting of 125mm HPPE Host pipe: 4" Cast Iron New meter boxes on all connections Replacement of lead services to property boundary Key Enabling Works Alternative Supply to facilitate pipe bursting
New Decade - New Challenges Annual Conference September 2010
New Decade - New Challenges Annual Conference September 2010
Other Issues
Form of Contract
Capital Works Management Framework Public Works Contract for Civil Engineering Works Designed by the Employer Public Works Contract for Civil Engineering Works Designed by the Contractor
New Decade - New Challenges Annual Conference September 2010
Standards for Products/Materials
Two Aspects Strength and Robustness Suitability for contact with Drinking Water Products/Materials Pipes/Liners/Coatings Valves and Fittings Service Pipes and Fittings
New Decade - New Challenges Annual Conference September 2010
Rehabilitation of AC Mains
Elephant in the Room EPA Response to Pipe Bursting Not a feasible option Options Cured in Place Pipe Close Fit Sliplining Offline Replacement Pipe Dealing with Existing Pipe?
New Decade - New Challenges Annual Conference September 2010
Records and Monitoring
Requirements of Appendix 7 of L6/07 UFW Reduction Prior to Rehabilitation Post Rehabilitation Maybe no reduction in UFW initially due to increased pressure Robust GIS system and procedures: New infrastructure Decommissioned infrastructure
New Decade - New Challenges Annual Conference September 2010
Opportunistic Works
Meter Boxes?
Lead Services?
New Decade - New Challenges Annual Conference September 2010
Advancing Rehab Implementation WSAs and Consultants Adoption of Mains Rehabilitation Strategy Identification of Contracts Setting Requirements Contractor Qualifications Performance Specifications Strategy for Rehabilitation of AC Mains Advancing Rehabilitation Contracts Resource and Training Needs Site Supervisory Staff
New Decade - New Challenges Annual Conference September 2010
Advancing Rehab Implementation Contractors Provision of Market Information Overall Programme – WSIP 2010 to 2012 Roll out of Contracts Contract Size Design by Employer or Contractor Rehabilitation Techniques Reasons Efficient & Effective Implementation by facilitating Contractors in identifying Plant Requirements Resource and Training Needs
New Decade - New Challenges Annual Conference September 2010
New Decade - New Challenges Annual Conference September 2010
Conclusions
Key Success Factors
Information Technique to match Specific Circumstances Competent Contractor Preplanning Response to Unknowns Contractor Employer/Engineer Engagement with Consumers
New Decade - New Challenges Annual Conference September 2010
Conclusions
Exciting New Phase in the Management of Water Infrastructure Assets Evolving Situation Technology and Materials Contractor Experience Testing in Ireland Ground Conditions Range of Contractors meeting Suitability Criteria The Challenge Leave a Better Water Network Infrastructure for the Next Generation
New Decade - New Challenges Annual Conference September 2010
Acknowledgements
Colleagues at TOBIN and Mouchel Joe Doyle, USA Ltd and USSR Ltd.
Michael Ward, Ward & Burke Construction Ltd.
New Decade - New Challenges Annual Conference September 2010