South West Water will use an innovative new process for the first time in the South West to clean the trunk main in Tiverton next week.
Over time very low levels of iron and manganese present in all water supplies build up on the internal surfaces of water mains which is periodically removed in a controlled and planned way.
The Ice Pigging process makes use of the characteristics of ice crystals in a water solution as a mildly abrasive medium to essentially scrape off and then encapsulate any deposited minerals within the plug of semi-solid ice. The system is highly effective and according to South West Water of all the techniques available, has the least effect on customers' water supply.
An ice solution, similar in consistency to a Slush Puppy or granita drink, will be pumped into the isolated water main. Once a suitable plug of ice has been introduced it is driven along the pipe by water pressure - the same water that would normally be flowing in the pipe. The plug of ice is driven at a speed that's most effective at removing any deposited minerals.
Operations manager Jason Harvey explained:
"The process makes use of the characteristics of ice crystals in a water solution to essentially scrape off and then encapsulate any deposited minerals within the plug of semi-solid ice.”
"The plug of ice is driven through the main until it reaches a pre-planned exit point - normally a fire hydrant. The ice is collected and removed off-site for appropriate disposal.”
"During the whole process the quality of the water in front, within and behind the ice plug is carefully monitored.”
"Once the cleaning team are completely satisfied the level of clean has been achieved and the water has returned to its normal excellent quality, the pipe will be returned to service."
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