city of san diego programmatic water transmission ... · awwa c200 + c205/c214 awwa c300 awwa c303...
TRANSCRIPT
Clinton McAdams, P.E.Daniel Rodriguez, P.E.
City of San Diego Programmatic Water Transmission Pipelines Condition Assessment
vvWhen we continue to
Think •Plan •Act we will achieve
Zero Injuries Today
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Safety Moment – Cell Phones
• Try to place calls while the vehicle is stationary
• Use a hands‐free or speaker phone accessory
• Do not text and drive
• Never read or write, apply makeup, etc. while
driving
• Be careful when pulling over to place calls —
do not stop in dangerous areas
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Learning Objectives
• Benefits of programmatic condition assessment approach.
• Present lessons learned from evaluating raw and potable water
pipelines.
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Agenda
• Project Background
• Project Approach
• Assessment Methods
• Project Results
• Lessons Learned
• Q&A4
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Project Background
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Pilot Project
• Three Transmission Pipelines Condition Assessment
• Highest‐risk pipelines inspected first
• 2 potable and 1 raw
• Established baseline for condition assessment approach
• Developed risk analysis factors and model
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• Proactive condition assessments on 136 miles of the oldest and largest‐
diameter water transmission mains
• 3 raw and 32 potable water pipelines
• Original install 1940s through 1960s
• 20‐inch to 54‐inch diameter
Current Project
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AWWA C200 + C205/C214 AWWA C300 AWWA C303
Cylinder Bar + Cylinder Pretensioned bars + Cylinder
Predominant Pipe Types
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Project Location
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Project Approach
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• Improve system reliability and reduce future O&M and replacement costs• Determine the current condition of each pipeline based on review of existing records and field investigations
• Perform inspections as safely as possible and minimize operational impact• Identify and prioritize pipeline segments for needed maintenance, rehabilitation, repair, and follow up monitoring actions
Project Objectives
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• Identifying and locating potential defects that present a risk of water supply service interruption
• Remaining flexible during inspection activities with regard to conditions encountered in the field and proposed changes to inspection methods
• Following the established safety protocol• Engaging the City
Project Objectives Achieved by…
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Project Workflow
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DATA COLLECTION AND RECORDS REVIEW• Asset Inventory• GIS Database
RISK AND PRIORITIZATION MODEL• Risk factors and weightings• Risk areas – focused
inspections
RESULTS AND RECOMMENDATIONS• Condition assessment
reports• Cost estimates
PRELIMINARY EVALUATIONS• Soil corrosivity• Geotechnical conditions• Environmental mapping
FIELD INVESTIGATIONS• Internal inspections• External inspections
ENGINEERING EVALUATIONS• Pipeline structural• Remaining service life
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Project Collaboration
ProjectCity
General Contractor
Technology Vendors
Subconsultants
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Assessment Methods
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Assessment MethodsAssessment Method Raw Water
PipelinesPotable Water
PipelinesBackground data and records review
Geotechnical desktop study Soil corrosivity evaluation Environmental evaluation Internal inspection Manned entry,
CCTV and leak detection CCTV and leak detectionValve assessments External inspection Extensive
(Visual, soil samples, SPR, SIR, mortar coating samples, UT)
Localized(Visual, soil samples, SIR, mortar coating samples, UT)
Structural analysis Risk analysis
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Assessment Methods – Raw Water Pipelines
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Assessment Methods – Potable Water Pipelines
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Project Results
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Condition Results – Correlations
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Condition Results – Risk Analysis
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Condition Results – Condition Curve
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Lessons Learned
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Inspection Method Effectiveness• Results justified future work
as well as urgent repair of observed defects –example shown
• Manned‐entry allowed temporary repair of defects during the shutdown that was already in effect
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Inspection Method Effectiveness• Leak detection useful,
especially when televised• Poor image quality when
televised during live‐flow conditions
• No silver bullet –excavations to investigate internal findings
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Project Approach Effectiveness
• No safety incidents occurred• Minimized operational impact
‐ inspected many potable pipelines without taking them offline, as shown
• Minimized environmental and social impacts
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Project Approach Effectiveness• Proved value of preemptive
pipeline assessment —example shown of high‐risk areas discovered, preventing future failures and service disruptions
• Data necessary to form condition baseline and to manage entire water transmission system
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Next Steps
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Next Steps
• Final condition assessment reports for potable pipelines
• Transmission main management plan
• Repair, rehabilitation, or replacement
• Future inspection and monitoring
• Operational & maintenance activities
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Questions & Answers
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Clinton McAdams, P.E.(925) 786‐[email protected]
Daniel Rodriguez, P.E.(925) 337‐[email protected]
Thank You!