指报告期末煤气、天然气由压缩机、鼓风机、出气罐的出口到用户立管之间的全部管道长度。不包括煤气厂厂内的管道和用户立管，但如果一条街道设有多条管道，应按每条管道的长度计算。
不需要破坏或改变管道长度。
No disruption or length change of connected piping is required.
提出了加设防冲板、缩短单根管道长度及增加加强圈的改进措施。
The improving measures, including the installation of anti-impacting plate and stiffener as well as cutting single pipe length, were proposed.
流量开关应该安装在水平管道或垂直管道上，每一侧至少有5倍管道直径的直线管道长度。
It should be installed in horizontal or vertical section of a pipe where there is a straight run of at least 5 pipe diameters on each side.
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