51312-01482-The Rehabilitation of Large Diameter Steel Piping: A Case Study of the 84” Sludge Return Piping Syst

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Product Number: 51312-01482-SG

ISBN: 01482 2012 CP

Author: Yaofu Zhang

Publication Date: 2012

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The market of pipe rehabilitation has been growing consistently at 8 to 10 percent per annum in the last approximately 10 years (Sterling et. al. 2009). The annual market for rehabilitation of wastewater infrastructure in the U.S. was estimated to be $3.3 billion in 2007 by Underground Construction magazine. Pipe rehabilitation methods use the existing pipe wall to form the new pipe or to support the new lining. Pipe rehabilitation can extend the life of the original pipe at occasions when excavation and replacement of the existing pipe is either infeasible or too expensive. The subject 84” sludge return piping system was placed in service in 1993. Since then other piping systems were installed between the 84” pipe and the “right-of-way” making it infeasible to replace the 84” pipe without cutting out many other pipes. The 84” steel pipe need rehabilitation to extend its service life and the new pipe interior surface must withstand the corrosivity of return sludge from the wastewater nitrification process. A hand full of methods is now available in the market for pipe rehabilitation each with their own advantages and drawbacks. It is costly and time-consuming for utilities to collect information about different pipe rehabilitation technologies and evaluate their applicability. This study aims at developing an easy-to-follow decision tree to help utilities narrow down pipe rehabilitation choices. The decision process for the 84” steel pipe rehabilitation is used to illustrate this decision tree.