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Drinking Water Engineering and Science An interactive open-access journal

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doi:10.5194/dwes-2017-3
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
01 Feb 2017
Review status
A revision of this discussion paper is under review for the journal Drinking Water Engineering and Science (DWES).
Quantity and Quality Benefits of in-Service Invasive Cleaning of Trunk Mains
Iftekhar Sunny1, Stewart Husband1, Nick Drake2, Kevan Mckenzie2, and Joby Boxall1 1Pennine Water Group, Department of Civil and Structural Engineering, University of Sheffield, S1 3JD, Sheffield, UK
2Scottish Water, Juniper House, Heriot Watt Research Park, Edinburgh, EH14 4AP, UK
Abstract. Trunk mains are high risk critical infrastructure where poor performance can impact on large numbers of customers. Both quantity (e.g. hydraulic capacity) and quality (e.g. discolouration) of trunk main performance are affected by asset deterioration in the form of particle accumulation at the pipe wall. Trunk main cleaning techniques are therefore desirable to remove such material. However little is quantified regarding the efficacy of different maintenance interventions, or longer term changes following such cleaning. This paper presents an assessment for quantity and quality performance of a trunk main system pre, post and for twelve months following cleaning using pigging with ice slurry. Hydraulic calibration showed a 7x roughness height reduction after ice slurry pigging, evidencing substantially improved hydraulic capacity and reduced headloss. Turbidity response due to carefully imposed shear stress increase remained significant after the cleaning intervention evidencing that relatively loose materials had be not been fully removed from the pipe wall. Ongoing material accumulation and associated discolouration risk was shown, with the rate of accumulation found to correlate with temperature. Overall the results demonstrate that cleaning by pigging with ice slurry can be beneficial for quantity performance, but care and further assessment may be necessary to realise the full quality benefits.

Citation: Sunny, I., Husband, S., Drake, N., Mckenzie, K., and Boxall, J.: Quantity and Quality Benefits of in-Service Invasive Cleaning of Trunk Mains, Drink. Water Eng. Sci. Discuss., doi:10.5194/dwes-2017-3, in review, 2017.
Iftekhar Sunny et al.
Iftekhar Sunny et al.
Iftekhar Sunny et al.

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This paper presents an assessment for quantity and quality performance of an trunk main cleaning using ice slurry pigging intervention. Hydraulic calibration showed a 7x roughness height reduction after ice slurry pigging, although turbidity response due to carefully imposed shear stress increase remained significant indicating loose materials had be not been fully removed from the pipe wall. Due to ongoing material accumulation, one off intervention is not sufficient to manage the quality risk.
This paper presents an assessment for quantity and quality performance of an trunk main cleaning...
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