本文对玻璃钢双层管道的特性及设计作了扼要介绍，以便在我国推广和开发。
This paper introduces briefly characteristics of FRP double containment piping for its promotion and development in our country.
保温管道的经济模型分为单层结构和双层结构两种。
The economical model of pipeline insulation is divided into single layer structure and double layer structure types.
一种金刚石绳锯机，特别适用于海底单双层油气管道和海底导管架的切割。
The utility model relates to a rope saw for diamond, which is suitable for cutting seafloor single and double layer oil gas pipelines and seafloor pipe frames.
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