Liquid or gas flow computer?

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A liquid flow computer provides additional features over a gas flow computer. Foremost amongst these is the inclusion of the many different API tables for the calculation of liquid properties such as density and vapour pressure. As the transfer of liquid products is based on batch transactions, a liquid flow computer also maintains batch data […]

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Choosing the right flowmeter

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As the primary method of measuring flows of oil and gas from the pipeline to the customer, flowmeters effectively constitute the front end of a custody transfer system. The need for high measurement accuracy, coupled with the characteristics of oil and gas flows, restricts the range of available flowmetering technologies to a handful of choices. […]

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Turbine Meters

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Turbine meters measure flow with a spinning rotor that spins in proportion to flowrate. They are approved for custody transfer of both natural gas and petroleum liquids. Like ultrasonic meters, they come in large line sizes of up to 42 in. and above. Both turbine and ultrasonic meters excel in measuring high speed gas flows, […]

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Positive Displacement Meters

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Positive displacement meters operate by capturing the fluid in small compartments of known quantity, and then measuring how many times this is done. Types of positive displacement meters include oval gear, spur gear, rotary piston, diaphragm, nutating disc, and helical. They are used for residential, commercial, and industrial applications. Both diaphragm and rotary meters are […]

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Differential Pressure Flowmeters

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Differential pressure (DP) flowmeters (Figure 3) measure flow by placing a constriction called a primary element in the flowstream. A DP transmitter is then used to compute flow based on the difference between upstream and downstream pressures. Orifice plates are the most common type of primary element. Others include Venturi tubes, flow nozzles, Pitot tubes, […]

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Thermal Flowmeters

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Thermal flowmeters measure flow by injecting heat into the flowstream, and then measuring how quickly this heat dissipates. They are almost exclusively used for gas flow measurement, though some are used to measure liquid flows. One main application for thermal flowmeters is measuring stack gas flows. Some measure flow at a single point, however, multi-point […]

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Vortex Meters

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Vortex meters measure flow by placing a bluff body in the fluid and then counting the vortices the bluff body generates. They are among the most versatile meters in that they can measure liquid, gas and steam with equal ease. Vortex meters are widely used for steam flow measurement, since they can tolerate both the […]

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Why oil prices declined

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August 2014 marked an important change in the supply/demand equation. From January 2013 until May 2014, world oil consumption exceeded world oil supply. During this time, oil prices averaged in the US$90 – US$100/bbl range. In May, June and July 2014, world oil supply and demand were closely balanced, but in August 2014, the supply […]

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Ultrasonic Meters

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Ultrasonic Meters

Ultrasonic meters (Figure 2) measure flow by comparing the time it takes an ultrasonic signal to travel across a pipe when it travels with the flow, as compared to its travel time against the flow. Like Coriolis meters, ultrasonic meters are highly accurate and reliable, and they do not have moving parts. Inline models are […]

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Coriolis Flowmeters

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Coriolis flowmeters operate by measuring the degree to which fluid momentum causes a vibrating tube to deflect. This enables Coriolis meters to measure liquids better than gases, since liquids are denser than gases. Coriolis meters are widely used in refineries and petrochemical plants, and also for downstream applications. They are used to measure billing and […]

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