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The County Sanitation Districts of Los Angeles County (Districts) operate and maintain a sewage collection system that includes approximately 1060 km (660 miles) of sewers made from unlined concrete pipe, which are susceptible to hydrogen sulfide corrosion. Sewer inspections conducted after 1975 revealed that corrosion rates had dramatically increased from previous years and that a number of sewers would require replacement or rehabilitation. Although replacement of corroded sewers is preferred, replacement was neither feasible nor cost effective in many instances. The Districts have awarded more than 50 contracts since 1986 for rehabilitating more than 77 km (48 miles) of corroded sewers ranging from 203 to 2286 mm (8 to 90 in.) at a construction cost in excess of 100 million. Most of these projects have been completed successfully within the contract time and with few change orders. Rehabilitation methods used included the following:

Sliplining with Centrifugally Cast Fiberglass Reinforced Plastic Mortar (CCFRPM), High Density Polyethylene (HDPE) and Polyvinyl Chloride (PVC) Segmented Liner Pipes

Cured-in-Place Pipe (CIPP) Liner

Folded/Re-formed PVC and Deformed/Re-formed HDPE Pipe Liners

PVC Pipe Lining System

Machine Spiral Wound PVC Pipe

Design, specifications, and construction issues including problems, solutions and results of projects using these rehabilitation methods are discussed.
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Document Type: Research Article

Publication date: 01 January 2000

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