1. 306,000 miles of high pressure transmission pipelines 1.1 Most installed in 1950's & 1960's 2. 2.1 million miles of local distribution pipelines 2.1 50% installed before 1980 2.2 112,000 miles considered leak prone 2.2.1 Bare steel 2.2.2 CI 3. Consequence of failure can be significant 4. Reduce GHG emissions.
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机译：1. 306,000英里的高压变速器管道1.1最具安装的管道和1960年代最具安装的2.1百万英里的当地分配管道2.1 50％安装在1980年之前2.2 112,000英里被认为泄漏2.2.1裸钢2.2.2 CI 3.结果失败可能很大4.减少温室气体排放。
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