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Client: Yarra Valley Water
Location: Yarra Valley, Melbourne, Australia
Pipe material: Cement lined cast iron, PVC
Pipe diameter: Up to 150mm
Pipe length: 5,462m
“Yarra Valley Water was able to get good quantitative information to prove the efficacy of the technique. The trials were successful and Ice Pigging definitely lived up to its claims and expectations”Peter Dang, YVW Project Manager
Yarra Valley Water is the largest of Melbourne’s three water corporations providing water supply and sewerage services to over 1.7 million people and over 50,000 businesses in the Northern and Eastern suburbs of Melbourne.
The Project - Drinking Water
After undertaking research they discovered Ice Pigging and trials begain in November 2011 which resulted in the removal of up to 17 times more sediment from the mains compared to water flushing whilst using half the amount of water.
Following on from the success of these trails, Yarra Valley Water commenced on a full-scale program which started in November 2013 to Ice Pig approximately 400km of water mains each year for the next five years.
The Yarra Valley Water supply network carries high levels of natural sediment that accumulates in the pipe network which result in a higher number of water quality complaints than the other Melbourne metropolitan water retailers.
Yarra Valley had historically undertaken mains cleaning primarily using water flushing. However, the downside to using this method was the very high volumes of water being used. Following on from the implementation of water restrictions back in 2006, Yarra Valley Water had to suspend their mains cleaning program and seek an alternative cleaning method.
Ice Pigging on a cost-per-metre basis was more expensive than that of flushing. However, when you consider the cost-per-kilogram of sediment removed, Ice Pigging was around six times cheaper.
Flushing was costing around $2,655/kg whereas Ice Pigging was £470/kg. Yarra Valley Water came to the conclusion that due to superior cleaning offered with Ice Pigging, there would be a decrease in the number of dirty water complaints leading to further cost savings in the reduction of unscheduled flushing jobs and the frequency of mains cleaning of supply zones.
The main driver of the Ice Pigging program was the reduction of water quality complaints. The number of complaints per 1,000 connections before and after Ice Pigging is assessed to determine how successfully Ice Pigging reduced water quality complaints.
Results were measured against all three methods and the incidence of water quality complaints was significantly reduced, and in some cases virtually elimnated, post Ice Pigging for all three supply zones.
The results to date prove that once Ice Pigging has taken place, a significant decrease in the number of water quality complaints is achieved. It was also found that Ice Pigging achieves a consistently high-level of sediment removal across the supply zone.