The principle of gas leakage from bell socket of cast-iron pipe after conversion from manufactured gas to natural gas is analyzed . Four solutions including pipe replacement PE pipe insertion joint repair and gas humidification are introduced and the techno-economic comparison of these solutions is made .

分析了天然气置换人工煤气后铸铁 管道 承插接口漏气原理，介绍了4种解决方案：管道更换、PE管内衬、接口修补及燃气加湿，对其进行了技术经济比较。

Different corrosion prevention measures for the bell and spigot joints of the pipe and the prestressed steel bares are adopted to ensure the safety performance in marine environment .

通过对 管道 承插口和预应力钢筋采取不同的防腐措施确保 管道在海水环境中达到安全使用的目的。

It 's structure must be air tightness no water percolation and no air leakage . Countermeasures against Gas Leakage from Bell Socket of Cast-iron Pipe after Natural Gas Conversion

结构要求密闭，不渗水、不漏气。天然气置换后铸铁 管 承插接口漏气对策