管道投产前必须进行通球，以清除管内杂物。
There is necessary to carry out ball through pipeline before commissioning to cleaning remains in construction in pipeline.
因此，在管道投产运行之前，必须对管道进行干燥。
Therefore, before being put into production, pipeline shall be desiccated.
对埋地热油管道投产预热过程进行了数值模拟计算。
The process of buried hot-oil pipeline during start-up is simulated by the way of numerically simulating technology.
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