Water Talks: Pipeline Maintenance

John Galleher

Operations & Maintenance Manager January 31, 2012

Concrete Pressure Pipe (167 mi) ◦ Reinforced Concrete Cylinder

◦ Prestressed Concrete Cylinder

◦ Reinforced Concrete Non-cylinder

◦ Concrete Bar-Wrapped Cylinder

Steel (132 mi) ◦ Concrete Coated

◦ Dielectric Tape Coated

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Data Collection ◦ Soils

◦ Design

◦ Inspection Reports

◦ Installation Techniques

◦ How the Pipeline is operated

Develop Performance and Impact Factors ◦ What affects the service life?

◦ How can we extend the life?

MaintenanceProcedures

Modes OfOperation

ConstructionPractices

ConveyedProduct

ExternalEnvironment

DesignFeatures

In Service ◦ Collect Pipeline Data Soil corrosivity, chemical analysis, etc

◦ Remotely Operated Rectifiers (corrosion control) ◦ Acoustical Fiber Optic Monitoring (wire breaks) ◦ Remotely Operated Vehicles (ROV’s) ◦ Leak Detection

Out of Service ◦ Visual Sounding, cracks, separated joints, etc.

◦ Electromagnetics (concrete pipe) ◦ Magnetic Flux Leakage (steel pipe)

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Test points to measure corrosion activity on the pipelines

Fiber Optic Cable

Location Data

Acoustic Data

Data Acquisition

System

Analysis

E-mail Notification Posted to Website

ROV inspections can: ◦ Reduce impacts to Member Agencies

◦ Decrease cost of shutdowns

◦ Reduce environmental impacts

Current ROV technology

◦ Video, sonar, and modeling software

Power

Supply

On-Board

Memory

Acoustic

Sensor

Microprocessor

Temperature

Sensor

Rotation

Sensor

Pinger

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Fortunately the Water Authority’s pipelines are large enough to walk (or sometimes crawl) inside to collect data.

Damaged Area

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Installing Steel Replacement

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1980 1985 1990 1995 2000 2005 2010 2015

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Cover prior to 1990

Top of Pipe

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