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