Wastewater System Selfies - Freese and Nichols, Inc. [email protected] Mazen...
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Wastewater System Selfies
Transcript of Wastewater System Selfies - Freese and Nichols, Inc. [email protected] Mazen...
Wastewater System Selfies
Background
Major Interceptor Failures - 2007
The Problem
•$2 million spent on cleaning large lines
•Drawbacks to existing testing methods
•Limited budget for rehabilitation
The Solution: Multi Sensor Inspection
Innovative Technology
3D Laser Module
Sonar Module
HD Camera
Module
HD Video Inspection
Sonar Inspection
Laser Inspection
Determining Remaining Useful Life
• DRY = Deterioration Rate per Year for Concrete Pipe
• Based on Pipe Age and Inspected Maximum Corrosion
• Several Factors for High DRY including: Manufacturing Issues, High Turbulence, Pipe Bends, Siphons, etc.
• ICAP Program to Date:• Lowest Rate: 0.003 inch/year
• Average Rate: 0.042 inch/year
• Highest Rate: 0.286 inch/year
• Incorporate DRY into rating matrix
RUL Calculated Based on Data
Outer Wall
Estimated
Original Inner
Wall
Measured
Inner Wall
1.25'' of
Pipe Wall Remaining
Determining Remaining Useful Life• Pipe age, maximum corrosion, RUL in years
remaining and RUL calendar year of failure are automatically calculated
• RUL is automatically calculated for each corrosion observation
Determining Remaining Useful Life• Example Inspection (96-inch line)
*Remaining Wall Thickness Estimated using DRY
Remaining Useful Life
Determining Remaining Useful Life
• RUL is automatically calculated for each ovality observation
36 - 50 years
0 - 2 years
> 15.0%5.0 – 10.0%0.0 - 5.0% 10.0 – 12.5% 12.5 – 15.0%
21-35 years
11-20 years
3-10 years
Pipe Manufacturers Specify 5.0 – 7.5% Maximum
Initial Deflection
71-100 years
41-70 years
11-40 years
3-10 years
0-2 years
Age is not an accurate indicator of a pipe’s
condition.
Pipe Age vs. Remaining Useful Life
Pipe Cleaning
Defect Examples
Case Study: Significant Wall Loss
Case Study: Structural Failures
Case Study: Ovality in Flexible Pipe
Case Study: Ovality in Rigid Pipe
Laser Inspection Verification
Our Progress – 189 miles (66%)
Benefits of Multi Sensor Inspection•Reduced capital improvements costs•Reduced operations and maintenance costs•Enhanced knowledge of asset status and life cycle•Developed SSAM Program
Reduced Capital Improvements
•Restoring capacity through detailed cleaning and debris removal
•Replacing portions of interceptors instead of the whole interceptor
Reduced Capital Improvements
Only 12% needed repairs
Identified over $27M in CIP savings
Reduced O&M Costs
•Reduction in:•Emergency repairs and reactive maintenance •Odor control chemicals and facilities•“Cleaning to inspect” vs. “inspecting to clean”
Reduced Cleaning Costs
Enhanced Knowledge of Assets
•Remaining useful life linked to GIS
•Baseline condition assessment
•Improved hydraulic model
Improved Hydraulic ModelModeled depth higher than field
measurements
External Recognition
AcknowledgementsFort Worth Water
Department
• Kenneth Morgan
• Kara Shuror
• Travis Andrews
• Robert Sauceda
Freese and Nichols
• Thomas Haster
• Steven Rhodes
• Stephen Johnson
White Rock
Consultants
• Rod Thornhill
Ace Pipe Cleaning
• Bruce Jameson
• Russell Brown
• Casey Carentine
