Emerson Process Management: Ultrasonic Meters for LNG

The Daniel 3818 provides high-accuracy dynamic flow measurement.
May 22, 2013

The meter is aimed at marine and offshore applications, including custody transfer, fiscal metering, line balancing, check metering, allocation measurement and tanker loading and unloading. Measuring LNG volume dynamically delivers higher accuracy than static measurement methods and can result in real savings. The meter provides a factory-proven linearity within ±0.15% and a meter factor uncertainty of ± 0.027% due to its multi-plane British Gas design, fast signal processing, and advanced transducer technology. Additional metering points on rundown lines can also improve process control. With a redundant four-path, multi-plane configuration that is the equivalent of two four-path meters in a single body, the unit utilizes two independent transmitters-one for each set of four chordal paths. This ensures complete measurement redundancy and the ability to poll each four-path meter separately. Acoustic processing is performed by specialized electronics designed to achieve high sampling rates, provide stable ultrasonic signals and optimal low flow response, delivering accurate, stable and reliable measurement.

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