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Title: Interface Detection In Liquid Pipelines Class No. 8065
Author: Christopher B. Laird
Source: 2001 International School of Hydrocarbon Measurement
Year Published: 2001
Abstract: Many petroleum pipelines are used to transport multiple liquids. These liquids are often pumped in series through the pipeline. For example, a tender of gasoline may follow a tender of diesel fuel. During a typical delivery, the diesel fuel is collected in a storage tank at the end of the line. As the trailing gasoline approaches the end of the line, it is necessary to identify when valves must be shifted so the gasoline can be diverted to another storage tank and avoid contaminating the diesel fuel storage tank. In this scenario, it becomes clear that a device for detecting the interface must be able to rapidly sense a difference between the two liquids and provide an output signal.

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