Title page for ETD etd-12232004-171016


Type of Document Master's Thesis
Author Lee, Juneseok
Author's Email Address jsl0202@vt.edu
URN etd-12232004-171016
Title Decision Support Tool for Optimal Replacement of Plumbing Systems
Degree Master of Science
Department Civil Engineering
Advisory Committee
Advisor Name Title
Loganathan, G. V. Committee Chair
Lohani, Vinod K. Committee Member
Younos, Tamim Committee Member
Keywords
  • optimal replacement
  • decision support tool
  • neural network
  • Copper corrosion
  • Life cycle assessment
  • Home plumbing
  • simulation
  • geographic information system
  • non-homogeneous poisson process
Date of Defense 2004-12-10
Availability unrestricted
Abstract
Pinhole corrosion leak in home plumbing has emerged as a significant issue. In the major water distribution system managed by municipalities and water utilities the costs are distributed among all subscribers. The home plumbing repair/replacement cost and possible water damage cost must be addressed by the home owner. There are also issues of the value of home, insurance rates, health consequences, and taste and odor problems. These issues have become major concerns to home owners.

Cradle to grave life cycle assessment is becoming an integral part of industrial manufacturing. In this thesis comprehensive details pertaining to life cycle assessment are presented. Copper tubing for plumbing installations is mainly obtained from recycled copper. Various stages of copper plumbing pipe manufacturing are explained. A comprehensive synthesis of various corrosion mechanisms is presented. Particular reference is given to copper plumbing pipe corrosion.

A decision support tool for replacing copper plumbing pipes is presented. The deterioration process is grouped into early, normal and late stages. Because available data reflects late stage process, an optimization, neural network and curve fitting models are developed to infer early and normal stage behavior of the plumbing system. Utilizing the inferred leak rates a non-homogeneous poisson process model is developed to generate leak arrival times. An economically sustainable replacement criterion is adopted to determine optimal replacement time.

Files
  Filename       Size       Approximate Download Time (Hours:Minutes:Seconds) 
 
 28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access 
  Abstract.pdf 127.75 Kb 00:00:35 00:00:18 00:00:15 00:00:07 < 00:00:01
  Appendix_A.pdf 25.21 Kb 00:00:07 00:00:03 00:00:03 00:00:01 < 00:00:01
  Appendix_B.pdf 448.11 Kb 00:02:04 00:01:04 00:00:56 00:00:28 00:00:02
  Appendix_C.pdf 133.27 Kb 00:00:37 00:00:19 00:00:16 00:00:08 < 00:00:01
  Chapter1.pdf 385.74 Kb 00:01:47 00:00:55 00:00:48 00:00:24 00:00:02
  Chapter2.pdf 634.35 Kb 00:02:56 00:01:30 00:01:19 00:00:39 00:00:03
  Chapter3.pdf 369.95 Kb 00:01:42 00:00:52 00:00:46 00:00:23 00:00:01
  Chapter4.pdf 357.39 Kb 00:01:39 00:00:51 00:00:44 00:00:22 00:00:01
  Chapter5.pdf 715.26 Kb 00:03:18 00:01:42 00:01:29 00:00:44 00:00:03
  Chapter6.pdf 13.24 Kb 00:00:03 00:00:01 00:00:01 < 00:00:01 < 00:00:01
  Chapter7.pdf 46.34 Kb 00:00:12 00:00:06 00:00:05 00:00:02 < 00:00:01
  Glossary.pdf 31.19 Kb 00:00:08 00:00:04 00:00:03 00:00:01 < 00:00:01
  VITA.pdf 9.79 Kb 00:00:02 00:00:01 00:00:01 < 00:00:01 < 00:00:01

Browse All Available ETDs by ( Author | Department )

dla home
etds imagebase journals news ereserve special collections
virgnia tech home contact dla university libraries

If you have questions or technical problems, please Contact DLA.