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Consumers Energy elects to put EFVs on all qualified lines. W.G. Willson. Pipeline Gas Ind., June 1999, 82(6), 68--72.

Installation of excess flow valves (EFVs) by an energy company in Michigan is described. This decision was taken after a rigorous analysis/risk management investigation that showed a highly favourable cost/benefit ratio. EFVs restrict gas flow by closing automatically if a service line is broken. Installation of EFVs is considered to be the best way of implementing DOT legislation requirements for new and replacement residential service lines. Decision analysis is an integral part of the process and the main steps are problem framing, model building, data collection and results analysis. Each of these steps is discussed.

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