告诉管道安装工煤气管道要小心。
Tell the pipelayer that he has to be careful with the gas pipe.
管道安装工作包括：预制加工、安置、对准、焊接和连接。
Piping erection work include: prefabrication, placing, aligning, welding and bolting.
例如，某尺度管道安装工作的劳动可被划分为如下4个里程碑。
For example, the work effort involved with installation of standard piping might be divided into four milestones.
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