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Client: Wessex Water
Location: Westbury, UK
Pipe material: Medium Density Polyethylene
Pipe diameter: 225-250mm
Pipe length: 1,638
“The results of the pump drop tests indicate a rise in pumping rate of approximately 6 l/s, some 30% increase in capacity."John Woodward, Wessex Water’s Water Design Engineer
The Project - Wastewater
Ice Pigging was used to clean one section of a dairy rising main with the aim of removing dairy waste. The main consisted of two sections which totalled 1638m, the first being 863m of 225mm diameter pipe and the second 775m of 250mm diameter pipe.
Wessex Water is a water supply and sewerage utility company serving an area of the South West of England, covering 10,000 square kilometres including Dorset, Somerset, Bristol, most of Wiltshire and parts of Gloucestershire and Hampshire.
The ability to remove waste products from the site had been decreasing over a number of months, this was due to material build up on the pipe wall reducing the diameter of the pipe and increasing pumping head.
Wessex Water proposed to carry out a scheme using Ice Pigging to clean one section of dairy rising main running between Northacre SPS and Westbury STW. The main consists of two sections totaling 1638m, the first being 863m of 225mm and the remaining 775m of 250mm polyethylene pipework. The material within the main was mainly dairy waste.
Fatty deposit from pipe wall
From right to left: water prior to the ice pig followed by ice containing sediment and fat from the pipe wall followed by clear material Ice Pigging.