Additionally, the ultrasonic flow meter is disturbed by noise and can be impacted by dirt and fluids. LimitationsĪt the onset, ultrasonic meters are costly. The ultrasonic meter works better than magnetic meters for oil and gas since gases and hydrocarbons are non-conductive. As a result, ultrasonic meters are used more in pipes 6″ and larger. Ultrasonic meters can also measure flows in large pipe sizes, unlike other popular choices (like Coriolis meters). Additionally, the meter has long-term reliability. Since the meter has no moving parts, it has lower maintenance because it does not have to be lubricated or parts do not have to be replaced. It is self-diagnosing, and the meter requires less frequent calibrations once calibrated. The device tolerates high and low temperatures, and the user can fasten the clamp-on style outside the pipe without penetrating it. The meter has good repeatability, high turndown, and rangeability, and can measure at high and low pressures. The ultrasonic flow meter is highly accurate, usually within 1%, and is approved for use in custody transfer (fiscal metering). Additionally, the introduction of a multi-path transit-time meter allows the meter to measure flow at more than one location, which increases the meter’s accuracy and permits measurement in demanding flows (swirls, irregularities, and cross-flow). For example, electronic processing improvements have permitted the meter to measure some fluids that aren’t clean. Over the years, there have been technological advances that have helped improve the limitations of the meters. The meter measures the difference in transit time between the two transducers, and the velocity difference is used to calculate flow. Of course, one transducer emits the ultrasound signal with the flow, while the other emits it against the flow. In the transit-time ultrasonic flow meter, the transducers are upstream and downstream, and each acts as a transmitter and receiver. There are two leading types, the transit time and the Doppler style meter. Transit-Time Ultrasonic Flow MeterĪn ultrasonic flow meter calculates the fluid volumetric flow. Thermal mass flow meters serve various applications, and blogs, such as this one, allow readers to learn the pros and cons of other meter styles, in this case, the ultrasonic flow meter, which is an approved custody transfer meter for natural gas. Our blog typically discusses applications for thermal mass flowmeters because that is our business. Natural Gas Flow Measurement In the transit-time ultrasonic flow meter, the transducers are upstream and downstream, and each acts as a transmitter and receiver. While this flow meter measures liquids and gases, this post highlights information on natural gas. This meter measures the natural gas volume and excels in custody transfer. We discuss the ultrasonic meter in this continuing series on natural gas flow meter types.
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