pig launcher and receiver trap 清管器收发装置
The installation of pig receiver &launcher is divided into above ground installation and underground installation.
收发球筒安装分地面安装及地下安装两种形式。
As silo is required and it is not convenient for receiver and launcher installation and pig disassembly, underground installation is not adopted now.
地下安装需设发射井，安装收发球筒及装卸清管器均不方便，现已不采用。
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