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Title: Flow Computer Applications In Liquid Measurement
Author: Rick Heuer
Source: 2004 International School of Hydrocarbon Measurement
Year Published: 2004
Abstract: Flow measurement of liquids has been around much longer than the measurement of gas. Even so, you would think that it would have evolved at a much faster pace than its counterpart. My guess is that it was much more of a challenge and required more effort to meter gas in the beginning. Liquids seem to have a more finite physical presence. I can always pour liquid into1 gallon containers & then count the containers. We are not so lucky with gas! But due to the complexity of some types of liquids and their chemical composition, metering them can pose to be an extreme challenge. Thus the need for improved metering devices, techniques and technology. Flow computers are designed for these types of tasks. Traditional liquid metering and control requires a turbine or PD (Positive Displacement) meter, Density input, Process Pressure and Temperature. Orifice metering which produces a pressure drop proportional to the rate of flow is common also. The API now recognizes Coriolis and Ultrasonic meters. Coriolis and Ultrasonic meters output a manufactured pulse. The coriolis is a true mass meter and the ultrasonic is a volume meter. These two types of meters also have the ability to communicate to the flow computer by digital communications. Thus providing measurement values along with internal diagnostic capability. Of the many application roles a flow computer works in, they are divided into two groups: ?? Fiscal ?? Operational Fiscal or custody transfer implies that a buying or selling transaction is taking place based on the flow computers calculated volumes. Operational in nature, denotes that its calculations are intended to control or supply input for fluidic process control. Both functions require high accuracy digital resolutions and speed, but only fiscal metering requires that the flow computer meet OMIL, API, and ISO type recommendations or standards. Measurement Technicians and Engineers are required to operate and maintain a variety of Hi- Tech field measurement equipment. Most of the field instrumentation is tightly integrated in a complete System functional environment. The larger the metering station, the more complex the system.

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