Flow Measurement & Control


Ultrasonic transducer with mini horn array

May 2020 Flow Measurement & Control

Emerson has released the Daniel T-200, a titanium-housed transducer, for its gas ultrasonic flowmeter product line, marking the first use of metal 3D printing to enhance the acoustic performance of ultrasonic flowmeters in custody transfer applications. The T-200’s robust design provides increased reliability, uptime and safety while achieving the highest accuracy class attainable in gas measurement.

In an ultrasonic flowmeter, transducers generate acoustic signals that are sent back and forth across the fluid stream. The arrival times of these signals determine the fluid flow velocity. Signal quality and strength are critical to measurement accuracy, which is paramount in custody transfer applications. An error of only 0,1% can equate to hundreds of thousands of dollars annually in a large-diameter, high-pressure pipeline.

To boost signal strength through the titanium housing, the T-200 uses a metal 3D-printed mini-horn array, which consists of an intricate geometrical structure of titanium horns and a titanium diaphragm that acts as a harmonic oscillator and matching layer. This maximises the sound energy coupled into the gas, which improves the signal-to-noise ratio and accuracy of the measurement.

“The T200’s mini-horn array could not be made without metal 3D printing technology, making it transformational to the sound quality and performance achievable through a titanium barrier,” said Kerry Groeschel, director of ultrasonic technology, Emerson. “Emerson is committed to developing innovative solutions that help our customers achieve safer, more efficient operations.”

The meter’s all-metal housing provides a barrier from corrosive hydrocarbon fluids and wet gas, thereby extending the life of transducer components and ensuring stable performance. This unique design allows the meter to be hydrotested with transducers in place, steam cleaned while in the operating line and blown down with no limits on the rate at which the meter can be depressurised.

The T-200 can also be safely extracted while the meter is under pressure without special high-pressure extraction tools, which reduces the possibility of greenhouse gas emissions during extraction. The capsule which contains the piezoelectric crystal used to produce ultrasonic sound waves is retractable as a single piece for simplicity and ease of use. No other gas ultrasonic transducer can be extracted under pressure without special tools and with so few parts to remove or touch in the removal process.


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