The

 

Knowledge

store

Maintenance

Benefits and Disadvantages of Using 'No-Disruption' Repair Techniques

Reference: 14/WM/12/33
ISBN: 1 84057 734 7
Published Date: 21/08/2014

Water companies are coming under increasing pressure to ensure that interruptions to water supplies are prevented or minimised as far as possible. This has resulted in increasing use of 'no disruption' repair techniques for leaks and bursts. This research project undertook a technical appraisal of water company experience of pipeline repair using a range of techniques, covering traditional ('disruptive') and 'no disruption' repair, with the aim of assessing the impact of the method selected on short and long-term network performance and on the consequent service to customers.

The Contractor, CH2M HILL, has analysed the data from a number of water companies within the United Kingdom to assess the impact of different network repair technologies on subsequent performance of the water distribution network. A Decision Support Tool was developed to enable water companies to select the best technique to use in various circumstances.

Price: £200  

Deterioration Rates of Long-life, Low Probability of Failure Assets: Project Report

Reference: 11/WM/13/2
ISBN: 1 84057 609 X
Published Date: 26/10/2011

Several asset groups within the water industry can best be described as long life, low probability, extreme consequence of failure assets. Inclusion of these assets within company investment plans requires consideration of the probability and consequences of asset failure in the future. Where failure probabilities are low, few historical failure data will be available for analysis. Therefore, failure probability must be estimated using alternative methodologies. Nonetheless, if a robust justification for capital maintenance is to be made, these methodologies must be objective, evidence based and capable of external audit. With this objective in mind, the study has undertaken the development of deterioration models based upon sound science and technology. A toolbox has been developed covering key asset groups and failure modes which also includes worked examples and case studies which demonstrate a range of real life scenarios.
The study considered the model outputs in the context of a wider risk-based process, which couples the consideration of failure consequence with the deterioration models in order to support sound intervention planning.

Price: £250  

Deterioration Rates of Long-life, Low Probability of Failure Assets: Literature Review

Reference: 11/WM/13/1
ISBN: 1 84057 608 1
Published Date: 26/10/2011

Several asset groups within the water industry can best be described as long life, low probability, extreme consequence of failure assets. Inclusion of these assets within company investment plans requires consideration of the probability and consequences of asset failure in the future. Where failure probabilities are low, few historical failure data will be available for analysis. Therefore, failure probability must be estimated using alternative methodologies. Nonetheless, if a robust justification for capital maintenance is to be made, these methodologies must be objective, evidence based and capable of external audit.
Before deterioration models and an overall approach were developed for the different asset types, an extensive literature review was carried out to identify how the problem is approached worldwide, both in the water industry and elsewhere.

Price: £50