Ultrasonic Flowmeters to Eliminate or Reduce the Effect of Noise

Ultrasonic flowmeters, under the premise of fixed installation conditions, improve the signal processing capability and diagnostic capability of the flowmeter itself, which can effectively reduce noise. Under normal conditions, the measurement accuracy of the flow meter is very important. If the accuracy cannot be guaranteed, the application of a flow meter to measure the flow of a noise-producing regulator valve will inevitably produce erroneous results. Therefore, improving the flowmeter's identification and detection of acoustic pulses, while improving the signal filtering capability, can improve the accuracy of the measurement.

In order to reduce noise interference, the flowmeter should be installed upstream of the regulating valve. The advantage is that the pressure is higher and the signal is stronger. It will not amplify the noise. Lengthening the upstream and downstream straight sections of the flowmeter and installing isolation devices between the flowmeter and the noise source will reduce noise. However, the length of the straight pipe may need multiple pipe diameters to reduce noise interference. Therefore, installing isolation equipment is more convenient and effective. Experiments show that filters, heat exchangers and turbine equipment are all good noise-reducing devices. Ultrasonic flow meter elbows and blind tees can also reduce noise. The best way is to install a blind tee. After the fluid passes through the blind tee, the noise is reflected back. The use of two valves to share the pressure drop also reduces noise, but it is usually more costly.

Ultrasonic noise reducer has a significant noise reduction effect. Denoisers use a single composite reflective device with the same wavelength as the flowmeter, foam or some viscous, elastic, absorbent devices to eliminate noise. Tests show that this method can reduce 30% of the noise. The noise reducer can be installed directly downstream of the flowmeter. The flange connection will not affect the accuracy of the flowmeter. Ultrasonic noise dampers usually block and have a certain pressure drop, so they lose some of their advantages. However, in some cases, the pressure drop of the noise reducer is negligible compared with the noise caused by the larger pressure drop of the regulating valve. Ultrasonic flow meters can use noise reducers to reduce noise in space-constrained situations such as offshore platforms.

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