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Clamp-on gas flow measurement using ultrasonic flow pattern recognition
Ultrasonic flowmeters have evolved over the years. Traditionally limited to liquids, the preferred technology was transit time with doppler meters suitable for dirtier applications. In recent years GE's Sensing business Introduced two technologies for clamp-on gas applications. The first clamp-on gas systems utilized transit time technology. Although effective in many cases, transit time technology required a certain density or pressure to operate effectively. With the patent-pending CTF878, GE introduces ultrasonic flow pattern recognition, or correlation tag technology - a first for ultrasonic gas flow measurement. Correlation tag technology brings clamp-on flow measurement techniques to metal pipes down to atmospheric pressure. As a result, correlation tag technology has the ability to operate at lower gas density than transit-time meters and with no restrictions of pipe size or gas composition. The correlation tag meter measures gas flow non-invasively in pipes from six to 30 Inches in diameter, over the range of 3.5 to 150 feet per second (1.1 to 46 meters per second). It is designed for applications such as natural gas transmission and distribution, compressed air, fuel gases, corrosive or toxic gases, high-purity gases, and air separation gases. Correlation tag flow measurement uses four clamp-on ultrasonic transducers arranged in two pairs, mounted externally on a pipe a known distance apart. Each pair includes a transmitter and a receiver. The transmitters send an ultrasonic signal in a continuous wave mode through the fluid to the receivers, forming an interrogation path. The continuous wave signal is modulated by turbulence and local density variations characteristic of moving gas, producing a unique turbulence signature. The flow velocity is then determined from time and distance measurements.
Clamp-on gas flow measurement using ultrasonic flow pattern recognition
Ultrasonic flowmeters have evolved over the years. Traditionally limited to liquids, the preferred technology was transit time with doppler meters suitable for dirtier applications. In recent years GE's Sensing business Introduced two technologies for clamp-on gas applications. The first clamp-on gas systems utilized transit time technology. Although effective in many cases, transit time technology required a certain density or pressure to operate effectively. With the patent-pending CTF878, GE introduces ultrasonic flow pattern recognition, or correlation tag technology - a first for ultrasonic gas flow measurement. Correlation tag technology brings clamp-on flow measurement techniques to metal pipes down to atmospheric pressure. As a result, correlation tag technology has the ability to operate at lower gas density than transit-time meters and with no restrictions of pipe size or gas composition. The correlation tag meter measures gas flow non-invasively in pipes from six to 30 Inches in diameter, over the range of 3.5 to 150 feet per second (1.1 to 46 meters per second). It is designed for applications such as natural gas transmission and distribution, compressed air, fuel gases, corrosive or toxic gases, high-purity gases, and air separation gases. Correlation tag flow measurement uses four clamp-on ultrasonic transducers arranged in two pairs, mounted externally on a pipe a known distance apart. Each pair includes a transmitter and a receiver. The transmitters send an ultrasonic signal in a continuous wave mode through the fluid to the receivers, forming an interrogation path. The continuous wave signal is modulated by turbulence and local density variations characteristic of moving gas, producing a unique turbulence signature. The flow velocity is then determined from time and distance measurements.
Clamp-on gas flow measurement using ultrasonic flow pattern recognition
Aufklemmbare Gasströmungsmessung durch Ultraschall-Strömungsmustererkennung
Frail, Chris (author)
2005
9 Seiten, 4 Quellen
Conference paper
Storage medium
English
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