Welsh Water are responsible for providing over three million people with a continuous, high quality supply of drinking water and for taking away, treating and properly disposing of wastewater.
A reservoir was being taken out of service and in order to do this, reversing the water flow was required. Challenges associated with reversed water flow can affect the customer’s water colour and Ice Pigging was so successful that out of the 9,000 potentially affected customers, there was minimal customer disruption.
Minimise customer disruption
Remove sediment build up
Improve tap water quality
Ice Pigging was chosen to clean 2.5km of a cement lined ductile iron pipe that provides water to 9,000 customers of Mynydd Llandygai and surrounding areas in North Wales. The pipe was cleaned over two nights with the main isolated for only 6 hours in total, resulting in no customer disruption and over 323kg of material removed from the two sections. Ice Pigging has allowed the company to reverse flows in a pipe which previously, would have been impossible at such short notice.
Over 323kg of material removed from two sections
Water flows reversed with zero customer disruption
Pipe outage for only six hours
Only two times the pipe volume of water was used throughout the entire process
Minimal enabling works required and no excavations
No post cleaning disinfection was required and mains were directly returned to service