The tight line transportation technology of oil pipeline must rely on reliable safety and protection means.
输油管道密闭运行，必须有可靠的安全保护。
Due to the technical improvement of several years ago, transportation through Golmud-Lhasa pipeline has undergone the transition from the floating tank process to the tight line process.
格拉管线几年前进行了维持性技术改造，实现了由“旁接罐”流程为主向“泵到泵”密闭流程为主进行顺序输油的转变。
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