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EFFECTS OF DENSITY AND VISCOSITY MEASUREMENTS ERRORS AT THE PIPELINE BATCH TRACKING SYSTEM

机译:管道批量跟踪系统中密度和粘度测量误差的影响

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Batch Tracking System (BTS) is commonly found as pipeline operational real time functionality within operator companies' control room. It tracks batches, offering amongst other information their volumes, positions and Estimated Time of Arrival (ETA). In order to reliably calculate those system outputs, BTS requires operational information like pressures, temperatures and flow rates, elevation profile, as well as some fluid physical properties, being the most important ones density and viscosity. This work aims to track the actual necessity of measuring those variables and to establish their impact on ETA in a 700km long South African multi-product pipeline network. Thus, the flow dynamic was analysed using a commercial pipeline flow simulator, where the network operational scenario was entirely reproduced and then variations of density and viscosity were introduced to track the effects on batches' ETA, per pipeline segment. As a result of the study, which employed usual refined products such as petrol and Diesel, it was identified: (i) both variables played a relevant role on the ETA estimation requiring to be accurately determined, even though viscosity is the most relevant; (ii) viscosity showed a more predictable behaviour as flow resistance shall take place independently of the elevation profile; (iii) density was highly dependent of the elevation profile; and (iv) the biggest ETA accumulated variation verified was around 128 minutes (due to a variation of -20% in the viscosity value) and the lowest one around 4 minutes (due to a variation of -2% in the density value).
机译:批处理跟踪系统(BTS)通常作为运营商公司控制室内的管道操作实时功能被发现。它跟踪批次,除其他信息外,还提供其数量,位置和预计到达时间(ETA)。为了可靠地计算这些系统输出,BTS需要操作信息,例如压力,温度和流量,高度剖面以及某些流体物理特性,这是密度和粘度最重要的特性。这项工作旨在跟踪测量这些变量的实际必要性,并确定它们对700公里长的南非多产品管道网络中ETA的影响。因此,使用商用管道流量模拟器分析了流量动态,其中完全再现了网络运行情况,然后引入密度和粘度变化以跟踪每个管道段对批次ETA的影响。研究的结果是,使用了通常的精制产品,例如汽油和柴油,发现:(i)尽管粘度是最相关的,但两个变量在需要准确确定的ETA估算中都发挥了重要作用; (ii)粘度表现出更可预测的行为,因为流动阻力将独立于高程分布而发生; (iii)密度高度依赖于海拔剖面; (iv)验证的最大ETA累积变化约为128分钟(由于粘度值变化-20%),而最低的约为4分钟(由于密度值变化-2%)。

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