Water Supply Vol 3 No 1-2 pp 1–9 © IWA Publishing 2003
Practical condition assessment options for critical trunk watermains
D. Nicholas*, M. Heathcote** and G. Moore***
*Hunter Water Australia Pty Ltd, PO Box 317, HRMC, New South Wales 2310, Australia (E-mail: nicholasd@labs.hwa.com.au)
**Product and Asset Planning Distribution, Sydney Water Corporation, PO Box 756, Chatswood, New South Wales 2067, Australia (E-mail: mark.heathcote@sydneywater.com.au)
***South Australian Water Corporation, GPO Box 1751, Adelaide, South Australia 5001, Australia (E-mail: greg.moore@sawater.sa.gov.au)
ABSTRACT
A review, originally carried out for Sydney Water Corporation, of a complete range of direct and indirect methodologies used to assess the condition of buried cast iron and steel water pipelines is presented. These techniques include pipe sampling, pit depth measurement, soil testing using various parameters, as well as other non-destructive testing (NDT) based on various electromagnetic principles. Both the literature and comprehensive field trials have shown that soil testing using linear polarisation resistance (LPR) methodologies as an input to statistical analysis packages is a cost-effective technique. Direct evaluation using remote field eddy current intelligent pigs can also be very useful for the direct examination of critical watermains but is limited to smaller sizes of DN 150-DN 375.
Full article (PDF Format)
PAY-PER-VIEW: Buy this article for £20.00 (IWA MEMBER PRICE: £15.00)
|
