Ultrasonic flowmeter

The Daniel 3818 Liquid Ultrasonic Flowmeter by Emerson Process Management is designed for marine and offshore applications and uses two 4-path meters for complete measurement redundancy.

05/13/2013


Redundant 4-path Daniel 3818 Liquid Ultrasonic Meter by Emerson Process Management provides stable, accurate and reliable dynamic volume measurement of LNG at cryogenic temperatures. Courtesy: Emerson Process ManagementEmerson Process Management's Daniel 3818 liquid ultrasonic flowmeter for liquefied natural gas applications are specifically designed for reducing flow measurement uncertainty throughout the LNG value chain. This meter is ideal for many marine and offshore applications, including custody transfer and allocation measurement. 

The 3818 provides a 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. Improvements in measurement uncertainty equate to a reduction in risk of the financial transaction. Additional metering points on rundown lines can also improve process control. 

With a redundant 4-path, multi-plane configuration that is the equivalent of two 4-path meters in a single body, the Daniel 3818 Ultrasonic Meter utilizes two independent transmitters — one for each set of four chordal paths. This ensures complete measurement redundancy and the ability to poll each 4-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.  

Each Daniel 3818 Ultrasonic Meter is calibrated at Daniel’s ISO/IEC 17025 certified flow calibration facility using a static zero flow test on liquid nitrogen and a full dynamic test on water.

The 3818 offers all the advantages of transit time and inline ultrasonic flow meters. They are full-bore meters with no internal moving parts to wear or drift, providing for low pressure drop and minimizing the risk of LNG flashing. Also available in large sizes, ultrasonic meters are well suited for high volume LNG transfers which equates to faster tanker loading and offloading. 

Emerson Process Management

www.emersonprocess.com 



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