Rarely is your water delivery system more vulnerable than during a shutdown, planned or unplanned. When work is being performed on large diameter transmission lines, the stakes are high and you cannot plan too much to ensure things go well. This paper presents case studies of large diameter water transmission pipeline shutdowns. In developing the case studies, a clear understanding of the risk is first developed with consideration to different design and construction approaches to specialized work of this nature. In reviewing the case studies together, lessons learned are identified and several industry best practices are outlined to help develop a toolbox and go into future shutdowns more prepared and better equipped to maximize the likelihood of success.
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