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Determination of safe and economic transportation temperature in hot oil pipelines

ZHANG Guo-zhong 1 MA Zhi-xiang 2 (1.University of Petroleum,Dongying 257061,China; 2.Natural Gas and Pipeline Company,PetroChina,Beijing 100011,China)  
The principles of safe and economic transportation temperature in hot oil pipelines and its influencing factors were discussed.The analysis results showed that the allowed shutdown time of hot oil pipeline depended on several factors including environment condition along the transportation pipeline,working state of pipeline and the repairing ability of oil business enterprise.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.The safety and economic operation temperature in hot oil pipeline depends upon some factors such as the allowable shutdown time of pipeline,seasons,diameter of pipeline,rheologic characters of crude oil,the environment along the pipeline,and piping heat insulation.The allowable oil temperature of pipeline with large diameter can be lower than that of pipeline with small diameter,while transporting the same oil in the same area.The allowable oil temperature in summer can be lower than that in winter.The condensation point is not the only basis for determining the allowable oil temperature at the inlet of heating station.
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