- One of the improvements identified as part of the Water Services Association of Australia asset
management processes benchmarking was to undertake further analysis to support the risk-based
maintenance strategy. The strategy would include analysis of pipe failures, modes and effects to
confirm the economic asset life and the replacement criteria.
- The current strategy is that low risk pipes are not replaced until they reach an unacceptable level of
failure and are then prioritised for replacement. The consequence of failures will be managed through a
rapid response to breaks via the maintenance contract. A pipe condition assessment study is being
carried out to help identify when assets are likely to fail and to predict the end of their economic lives.
- Manukau Water owns and operates approximately 2,077km of watermains servicing approximately
103,000 residential, commercial and industrial customers. The asset management plan separates the
pipes by type into the following categories; fibrolite, copper/galvanised steel, PVC, MDPE, concrete
lined steel, ductile iron and other. There are approximately 964km, 667km and 342km of fibrolite, PVC
and MDPE pipe in the network respectively. The remaining 104km of pipe consists of other materials
such as concrete-lined steel, ductile iron, cast iron and galvanised steel. This analysis was carried out
on main pipe types only.
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Resource - Conference Papers