Watermain Rehabilitation Eliminating the need for temporary bypass Derrick Horsman, P.Eng. Alltech...

Watermain RehabilitationWatermain RehabilitationEliminating the need for temporary bypassEliminating the need for temporary bypass

Derrick Horsman, P.Eng.

Alltech Solutions INC

OverviewOverview

Watermain problems and issuesWatermain problems and issues Spray Lining OverviewSpray Lining Overview Same Day Return to Service ?Same Day Return to Service ?

Eliminating Temporary BypassEliminating Temporary Bypass

The Problem:Despite recent increases in public infrastructure investments, municipal infrastructure is decaying faster than it is being renewed.1

1 National Guide to Sustainable Municipal Infrastructure.


The Cause:

Internal (External) corrosion

Watermain breaks

Pipe surpassed useful life


Inadequate Fire Inadequate Fire ProtectionProtection

High Rate of LeakageHigh Rate of Leakage


What do we do?What do we do?


Conventional open cut replacement

Low dig options Directional drilling Sliplining Pipebursting CIPP lining

Traditional Cleaning and Spray LiningCement lining processEpoxy lining process

Modern Cleaning and Spray LiningRapid cure polyurethane systemRapid cure high build system


TRADITIONAL CLEANING AND SPRAY LINING Cement Lining process Epoxy Lining process

• Less expensive• No reduction in flow capacity• No requirement to re-tap services

• Some disruption• Not suitable for certain water types• Superseded in Europe by polyurethane lining systems.• Requires above ground temporary water supply $$$$$$$ ??

Spray LiningSpray LiningSpray LiningSpray Lining


TRADITIONAL CLEANING AND CEMENT LINING



MODERN CLEANING AND SPRAY LINING Rapid Cure Polyurethane system Rapid Cure High Build system




• Same day return to service•Only approved rapid cure material <15 sec•Potential for contamination effectively eliminated•No leaching•Immediate rectification of lining faults




• Same day return to service• No requirement for above ground bypass

•Improved customer services; multi-stage notification process•Operations carried out during working hours•Removes potential hazards (ie. Tripping hazards, random breaks, security issues)




• Same day return to service• No requirement for above ground bypass • Substantially less expensive - cost of bypass 20-45% of total job (Awwarf)

•Cost of temporary resources reduced•Shorter construction duration




• Same day return to service• No requirement for above ground bypass • Substantially less expensive• Greatly reduced disruption

•Minimal setup time•Rapid road reinstatement•Small job site footprint




• Same day return to service• No requirement for above ground bypass • Substantially less expensive• Greatly reduced disruption• Some revaluation of capital asset?• No reduction in flow capacity

•Application of 1mm – 5mm




• Same day return to service• No requirement for above ground bypass • Substantially less expensive• Greatly reduced disruption• Some revaluation of capital asset?• No reduction in flow capacity• No requirement to re-tap services



Spray Lining High Build Structural Spray Lining High Build Structural SystemSystem


1. Tough enough to survive dynamic loading at failure2. Ductile enough to accommodate movement after failure3. Sufficient shear strength to maintain longitudinal continuity4. Sufficient flexural strength to provide long term corrosion void spanning

capability

Performance Requirements for Lining Material




Semi-Structural Lining

0

1

2

3

4

5

6

2 4 6 8 10 12 14 16 18 20 22 24Operating Pressure (Bar)

Lin

ing

Th

ickn

ess

(mm

)

1 Bar = 14.5 psi

@3mm 145psi

@5mm 348 psi


Rapid Cure Polyurethane North American Experience•City of Saint John, NB •City of Moncton, NB•Atlantic Health Sciences Corporation, Saint John, NB•Millstone Nuclear Power Plant, Niantic, CT, USA•Region of Niagara, ON•New York Department of Environmental Protection

Rapid Cure Polyurethane International Experience•United Kingdom, Russia, India, Switzerland and Malaysia•More than 8,000 km in the UK by our partner affiliates

Spray Lining – Rapid Cure Spray Lining – Rapid Cure PolyurethanePolyurethane

Spray Lining – Rapid Cure Spray Lining – Rapid Cure PolyurethanePolyurethane


QUESTIONS ???


Watermain Rehabilitation Eliminating the need for temporary bypass Derrick Horsman, P.Eng. Alltech...

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