A new model has increased the efficiency and safety of air-exhaust procedures in the commissioning of liquids pipelines in hilly terrain. Air accumulated in a pipeline during commissioning can damage it and make interface tracking in batch transportation difficult, requiring the air's efficient discharge. Such accumulation frequently occurs in long-slope pipe segments in hilly terrain, increasing the importance of determining the size and location of any air pockets in these settings. In traditional commissioning procedures, determining the location of the air mass and the time of its exhaust relied on the use of pressure devices: If air intake occurred, the entire transport line would shutdown and exhaust the air at the pipeline's peaks. This method of air exhaust was passive and time consuming and led to greater quantities of contaminated product. This article applies both fluid mechanics theory and multphase flow theory to analyze the formation and movement of intake air encountered during commissioning of the China West Products Pipeline. It presents equations for calculating the location and length of intake air in the pipeline in an effort to provide theoretical support for accurately determining air exhaust in the commissioning of future hilly terrain pipelines. The resulting model allows air mass pressure, length, and location to be calculated under normal transportation conditions for other pipelines. The calculation results show a certain distance between where air stagnates and the pipeline's next peak. Using the model in practical applications can move the air to the predesigned air exhaust points by regulating liquid flow rate and pressure.
Model increases liquids lines' exhaust efficiency
Oil and Gas Journal ; 105 , 40 ; 70-80
2007
7 Seiten, 8 Bilder, 3 Tabellen, 6 Quellen
Aufsatz (Zeitschrift)
Englisch
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