Flow Measurement of Heat Transfer Oil In a Dutch refinery, a special heat transfer oil is used to supply process heat for the distillation columns. The oil is heated up to 570 °F and conveyed through a system of thermally insulated pipes to the columns. Effective operation of this installation requires reliable flow measurement of the oil. Before FLEXIM's non-intrusive ultrasonic flow measurement technology was introduced, the flow was determined by means of a differential pressure measurement. Operations had to be stopped once a year in order to carry out the inspection and maintenance of the system. The medium is a carcinogenic substance. Therefore all maintenance work required special preparation and precautions. Moreover, the measuring site is located in a hazardous area. Non-intrusive

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