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Title: Ice pigging in the water industry
Author: Ainslie, Eric Allan
ISNI:       0000 0004 2739 1566
Awarding Body: University of Bristol
Current Institution: University of Bristol
Date of Award: 2010
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Ice pigging is a method of cleaning pipes using a thick ice slurry, consisting of ice particles and an aqueous solution. The rheological properties of the ice slurry are such that both liquid and solid characteristics are observable, depending on the flow conditions. In 2007 this method was adopted by Bristol water, under trial conditions, to re- move sediment from large diameter pipes. Over 50 trials were carried out, principally on the Bristol Water network Two mathematical models were developed to predict the ice slurry performance given a range of operating parameters. Outlet monitor- ing equipment was developed for the purpose of investigating the ice slurry behaviour, allowing the mathematical models to be compared to actual data from trials. The model was found to provide an acceptable fit to the range of trial data, despite the difficulties in estimating the exact conditions. The outlet equipment was also developed to provide real time information on the current condition of flow exiting the hydrant, allowing a PLC system to advise on operational decisions. Numerous observations concerning operational conditions required for optimal pigging were made, including: valve configurations and timing; importance of the Froude Number for various stages of flow; and breakthrough or percolation of push water through the ice pig as flow along the pipe occurs. A website and server were set up allowing access to the model from any location, without large computer processing power being required. The results of the model were interpreted to provide realistic and usable suggestions to improve the performance of the ice pigging procedure for the conditions provided. A brief discussion of ice pigging rig development is given, describing the transition from manually operated ice slurry production, conditioning and dispensing, to a user friend unit which can be operated with a reduced understanding of the process.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (D.Eng.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available