American Society of Civil Engineers

Structural Condition Assessment for Long Term Management of Critical Sewer Pipelines

by Sandra Rolfe-Dickinson, (Technical Director, Pipeline Engineering, MWH, 201 Amersham Road, High Wycombe, UK E-mail:
Section: Infrastructure Assessment/Monitoring 2, pp. 1058-1067, (doi:

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Document type: Conference Proceeding Paper
Part of: Pipelines 2010: Climbing New Peaks to Infrastructure Reliability: Renew, Rehab, and Reinvest
Abstract: This paper presents a risk-based inspection approach for large diameter sewers in a UK water company. The approach uses structural engineering principles for buried pipelines to estimate Factors of Safety (FOS) as surrogate measures of failure likelihood. To ensure coverage of the large set of sewers, engineering judgement and rules of thumb were used to provide sufficient information to calculate FOS-values. for those sewers with calculated FOS-values less than 1, failure was considered imminent. Future inspection of these sewers was then prioritised based on the perceived consequences of collapse. Consequence assessment was based on the size of collapse hole that would be produced at the surface from sewer failure and the number of roads that would be affected. The client used the method to prioritise sewers for future CCTV and walk-through inspection

ASCE Subject Headings:
Structural analysis