Title page for ETD etd-07072006-191236

Type of Document Master's Thesis
Author Farooqi, Owais Ehtisham
URN etd-07072006-191236
Title An Assessment and Modeling of Copper Plumbing pipe Failures due to Pinhole Leaks
Degree Master of Science
Department Civil Engineering
Advisory Committee
Advisor Name Title
Loganathan, G. V. Committee Chair
Bosch, Darrell J. Committee Member
Younos, Tamim Committee Member
  • goal programming
  • Pinhole leaks
  • copper pitting
  • home plumbing
  • spatial and temporal patterns
  • water quality
  • causality factors
  • probabilistic modeling
  • scoring system
  • optimal replacement
  • corrosion modeling
Date of Defense 2006-05-19
Availability unrestricted
Pinhole leaks in copper plumbing pipes are a big concern for the homeowners. The problem is spread across the nation and remains a threat to plumbing systems of all ages. Due to the absence of a single acceptable mechanistic theory no preventive measure is available to date. Most of the present mechanistic theories are based on analysis of failed pipe samples however an objective comparison with other pipes that did not fail is seldom made. The variability in hydraulic and water quality parameters has made the problem complex and unquantifiable in terms of plumbing susceptibility to pinhole leaks.

The present work determines the spatial and temporal spread of pinhole leaks across United States. The hotspot communities are identified based on repair histories and surveys. An assessment of variability in water quality is presented based on nationwide water quality data. A synthesis of causal factors is presented and a scoring system for copper pitting is developed using goal programming. A probabilistic model is presented to evaluate optimal replacement time for plumbing systems. Methodologies for mechanistic modeling based on corrosion thermodynamics and kinetics are presented.

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