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１ 引 言随着天然气的大量使用，对原有人工煤气管道兼容、改造或新建是迫在眉睫和无法回避的课题。人工燃气管道通常工作压力是３．５ｋＰａ。天然气管道通常分为３个压力等级：高压管道０．４～１．６ＭＰａ，中压管道０．２～０．４ＭＰａ，低压管道０．００２～０．２
1 Introduction With the large-scale use of natural gas, compatibility, modification or new construction of existing artificial gas pipelines is an imperative and unavoidable issue. Artificial gas pipelines usually have a working pressure of 3.5 kPa. Natural gas pipelines are usually divided into 3 pressure levels: high-pressure pipelines 0.4 to 1.6 MPa, medium-pressure pipelines 0.2 to 0.4 MPa, and low-pressure pipelines 0.002 to 0.2