Design And Implementation Of The SCADA System In Product Oil Pipelines

As an important part of modern national energy construction, the pipeline has thecharacteristics of long distance, wide range and great difficulty of productioncommand. As a result of the custody transfer process piping, a unified hydraulicsystem was formed across the board, so the disturbance of any point of the pipelinewill quickly spread across the board. To ensure safe operation of pipelines, oilpipelines must be under timely operational supervision and accurate operationalmonitoring control. Because of slow reaction and a heavy task load，the way oftraditional telephone command, manual record and gradual long-distance pipelinemonitoring report are too difficult to meet the requirements of coordinated operationof custody transfer, supply and demand changes, and safe economic operation.Supervisory Control and Data Acquisition system of oil pipeline (referred to asSCADA) must be built to ensure the centralized command and unified management tosave manpower, and to greatly improve the speed of production scheduling.Using the development and construction of Hunan pipeline SCADA system as abackground, this paper designed the framework of the SCADA system. Combinedwith the functional requirements of a dispatch center and station pipeline system, thepaper also provides the hardware configuration and selection, according to theacquisition of major equipment such as oil pumping station units, valves, on-sitemonitoring and control instrumentation, and I/O signal type and quantity. It also tellsus how to achieve pipeline transportation, process data acquisition and control logicthrough the configuration software development. SCADA real-time database systemuses "System-Hierarchy-Locations-Properties" to describe the structuralmonitoring system. The dynamic equations of high-speed operation to describe thedynamic behavior and the monitored behavioral constraints within and between themonitored objects, so that the data of SCADA system can update quickly, and therefresh cycle of the control screen can be short. Through a variety of monitoringconfiguration screens, the operators can not only stay in the station control room tolearn the production of real-time operational status station in real time, but alsocontrol the station equipment, field parameters, and processes remotely by monitoringthe screen control buttons directly.After rigorous factory testing and site acceptance testing, SCADA systems meet the design requirements of the indicators. During nearly three years, the pipeline hastransported more than30lots in the field of system operation and management. Andmore than600million tons of oil has been transported. The system is proved to bestable and reliable, and its advanced monitoring functions can effectively protect theoil’s safe smooth transportation. The automated management and control system is ofhigh cost performance, which satisfies not only requirements of process operations,but also field management and production scheduling. Compared with the SCADAsystems in foreign countries, this system has high cost-effectiveness. It has achieved arich functionality with less investment and time, and greatly increased the level ofautomation in the transport of oil.