Cost Benefit Analysis of Excess Flow Valves: An Update. Topical Report, August 1991

摘要

Calculations and analysis of the cost-to-benefit ratio of using excess flow valves (EFVs) of all U.S. new and renewed gas services operating at 10 psig or more are presented. The study is an update of an earlier evaluation performed by the same contractor, entitled 'Costs and Benefits of Excess Flow Valves in Gas Distribution Services' (GRI-86/0022). As calculated with up-to-date information and average operating cost data, the ratio continues to be unfavorable even when using high value for human life and injury and low operating cost data. Data collected from EFV users indicate that EFVs are highly reliable and generally perform as required with very few problems. The report expresses the opinion that the cost-to-benefit ratio is highly dependent on individual company operations, location, and pipeline characteristics, and that the decision to use EFVs should be left to individual companies after performing their own cost benefit analysis, which should include an assessment of alternative accident mitigation measures.