Utilizing Remaining Useful Life for Asset Management of Critical Wastewater Assets City of Fort Worth: Darrell Gadberry; Freese and Nichols, Inc.: Mazen Kawasmi P.E., Jessica Brown P.E., Steven Rhodes, E.I.T.; Ace Pipe Cleaning: Bruce Jameson
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Objective
Research Pipe Wall Thickness
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Interceptor Condition Assessment Program (ICAP) Process
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• Wall thickness is not included in available
electronic as-builts.
• Construction files and shop drawings are the
most reliable source of and highest quality
data.
• Files contain contract documents, wall
thickness, material testing reports and
inspector diaries.
• Files are stored in boxes and required
organization and cataloging to be utilized.
Obtain original pipe wall thickness
Strategic Cleaning Field Inspection
ICAP Findings and Interceptor Scoring
• Systematically evaluate the condition
and estimate the remaining useful life
of critical wastewater infrastructure
• Utilize latest technology of 3D laser,
sonar and HDTV to measure level
of corrosion (Condition) and debris
(Capacity)
• Provide critical data to assess
rehabilitation needs and CIP priorities
• Establish deterioration rate per year
of critical wastewater interceptors
• Inspection and comprehensive condition
reports showed that only 40% of lines
needed cleaning.
• Only 63% of initial cleaning budget expended
• ICAP is projected to save Fort Worth $15
million in cleaning costs alone over the
next 10 years.
Over 1,000 cubic yards of deposition removed Measure actual pipe wall thickness and debris
National Recognition
Establish Scoring System for Corrosion Levels,
Deflection or Defects Assign RUL Scores
Remaining Useful Life (RUL)
Sonar Measured
Debris
ICAP Recommendations
Data from Field Investigations
• Pipe Attribute Data (Diameter, Material, etc.)
• Level of Corrosion
• Debris Volume
• Average Debris Depth
• Average Water Level
• Ovality
• Defect Locations
• Structural Integrity
Managing Critical Wastewater Assets • Establish baseline condition of existing interceptors
• Identify emergency repairs before total failure occurs
• Extend RUL of existing interceptors
Odor Control • Reduce or eliminate cause/source of H2S
• Reduce or eliminate collection system odor control stations/chemicals
Prioritizing Rehabilitation CIP • Improve Hydraulic Model Accuracy and CIP Priorities
• Develop Prioritized Rehabilitation Projects
HD CCTV 3D Laser 3D Laser
Sonar Sonar
Outer Wall
Measured Inner
Wall
Original Inner
Wall
Integrate ICAP Recommendations into
Wastewater Master Plan CIP
