Oil temperature drop and oil contraction can cause gas space growing in oil pipe and line packing during hot oil pipeline shutdown and restarting.
热油管道停输后，管内油品降温收缩，管内会产生油蒸气空间，从而使管道再启动时出现启动充装过程。
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The safe and economic operation temperature in hot oil pipeline is the lowest temperature at the inlet of heating station to satisfy the requirement of permissible shutdown time of pipeline.