Research on influence of pipe diameter size deviation on the measurement performance of ultrasonic flowmeter
Correct installation is the precondition to ensure the accuracy of gas ultrasonic flowmeter.Based on the high-pressure flow standard device,the test of ultrasonic flowmeter with cross 4-path is carried out under the conditions with and without installed pipe size deviation,within the velocity range of 1.5～12 m/s at pressure of 0.1～2 MPa.The results show that the measurement error is up to 0.10%which is resulted from the size deviation of 8mm.In order to quantitatively analyze the influence,the systemic research with the combination of numerical simulation and test is conducted with different size deviation,pressure and diameter of ultrasonic flowmeter.The results show that the influence of pressure on the measurement error can be ignored for the positive size deviation,and the results in the transition of measurement error from negative to positive for the negative size deviation with the increase of pressure.The influence of size deviation on the measurement results increases with the decrease of the diameter of ultrasonic flowmeter which can reach 0.20%for DN50 ultrasonic flowmeter with 3 mm size deviation.
NETL
NSTL
万方数据
