This paper analyzes the operation cost problem of hot oil pipeline.
针对热油管道运行费用问题进行了分析。
Restart process of hot oil pipeline is an unsteady property-variable coupling flow.
热油管道再启动过程是一种不稳定的变物性耦合流动。
The calculation of the unstable temperature of the soil around pipeline is the first step to evaluate the hot oil pipeline.
评价埋地热油管道的的热工状况，首要的问题是计算管道周围土壤的非稳态温度场。
Restart process of hot oil pipeline is kind of unstable coupled flow that physical property of oil varies with oil temperature.
热油管道再启动过程是一种不稳定的变物性耦合流动。
The paper introduces a method for calculating the heating load of initial station or heating station of hot oil pipeline, and gives proof to it.
为此，介绍了一种热油管道首站或加热站加热负荷的计算方法，以合理确定管道首站和中间站的热负荷。
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。
Studying the temperature distribution of hot oil pipeline shutdown medium field, has an important role in guiding to determine the safety shutdown time.
研究热油管道的停输介质的温度分布场，对确定安全停输时间具有重要的指导作用。
A mathematical model for determining the thermal influence zone of buried hot oil pipeline was developed and solved numerically by the finite element method.
建立了埋地热油管道热力影响区的数学模型，并用有限元法进行了求解。
So it is necessary to study the optimization operation of hot oil pipeline after adding DRA, which can make optimal scheme and provide basis for scientific decision.
因此，有必要对热油管道中添加减阻剂的优化运行进行研究，制定最优运行方案，为科学决策提供依据。
Unstable coupled flow usually presents during the restarting process of a hot oil pipeline system as the physical properties of the hot oil vary with its temperature.
热油管道再启动过程是一种不稳定的变物性耦合流动。
The cost structure of energy consumption of hot oil pipeline has greatly taken place by the constant increment of electrovalency and great drawdown of heating oil price.
由于电价不断上涨导致燃油价格大幅度下降，使热输管道的能耗成本结构发生了较大变化。
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.
热油管道安全经济输油温度是满足管道允许停输时间要求的最低进站油温；
The velocity change of instantaneous negative pressure wave along the pipeline is analyzed when hot oil is transported. Two searching methods are applied to locate leakage through numerical integral.
分析了热油输送管道沿程瞬态负压波传播速度的变化，采取两种搜索方法数值积分求解泄漏点位置。
The heat transmission of products pipeline along with hot crude pipeline in one ditch has some effects on the operation of crude oil pipeline.
同沟敷设管道中成品油管道和原油管道间的传热对原油管道的运行有一定的影响。
It is important for majoring pipeline construction and drawing up the craft of hot crude oil transportation.
这对于优化管道建设和制定科学合理的热油输送工艺具有重要的作用。
Flexibility design method of large scale hot oil pump inlet piping is expounded as well as the layout of pipeline, support and hanger.
介绍了大型热油泵入口管系的柔性设计方法、管道的布置方式、支吊架的设置方式。
The process of buried hot-oil pipeline during start-up is simulated by the way of numerically simulating technology.
对埋地热油管道投产预热过程进行了数值模拟计算。
The implementation of hot work for station crude oil pipeline must be in accordance with the standard of SY5859-93 because the media transported are solidifiable, inflammable, and explosive.
根据输油生产的连续性特点以及输送介质具有易凝、易燃、易爆的性质，站内原油管道施工动火必须严格遵循SY5859—93《石油工业企业动火安全规程》。
The heat transmission of products pipeline along with hot crude pipeline in one ditch has some effects on the operation of crude oil pipeline.
对加降凝剂原油管道的运行参数和泵站的运行特性进行了分析，建立了原油管道的运行优化模型。
They are widespread used for steam, hot water, water, oil goods, gas, metallic, acid alkali and salt technical pipeline as the adjusting and stopping setting.
可作为调节和截止装置，广泛应用于蒸汽、热水、水、油品、煤气、天然气、化工、酸碱盐等工艺管路中。
They are widespread used for steam, hot water, water, oil goods, gas, metallic, acid alkali and salt technical pipeline as the adjusting and stopping setting.
可作为调节和截止装置，广泛应用于蒸汽、热水、水、油品、煤气、天然气、化工、酸碱盐等工艺管路中。
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