In different from the situation of industrial water ultrasonic flowmeter calibration conditions of scale operation

Abstract: the different from the situation of industrial water ultrasonic flowmeter calibration conditions scale operation information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. 1, now, used in the measurement of natural gas ultrasonic flowmeter calibration is carried out on the flow calibration device as possible. Since almost all of these devices using natural gas through the pipeline, under normal circumstances, it is impossible to change the parameters of impact velocity, for example. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the different from the situation of industrial water ultrasonic flowmeter calibration conditions operating post the details of the scale. 1, now, used in the measurement of natural gas ultrasonic flowmeter calibration is carried out on the flow calibration device as possible. Since almost all of these devices using natural gas through the pipeline, under normal circumstances, it is impossible to change the parameters of the impact velocity of sound, such as temperature, pressure, gas composition. When these parameters when using ultrasonic flowmeter numerical dissimilarity in the calibration case, calibration can also play a role? In order to quantitatively describe the change of these parameters on the effect of ultrasonic flowmeter calibration, conducted a series of careful control of the calibration experiment. * step experiment included in southwest research institute ( SwRI） Used in the high voltage circuit of pressure 2. 8MPa（ 400 psi) The calibration gas medium a 200 mm ( 8inch） And a 300 mm ( 12inch） The ultrasonic flow meter. As additional reference, 200 mm and 300 mm of turbine flowmeter is applied in the loop. And then changed the fluid medium to nitrogen gas velocity change by 16%, and the numerical equivalent to natural gas on 4. 6MPa（ 677psi） The pressure. In order to further test pressure for ultrasonic flowmeter calibration, the influence of the pressure from 1. 4MPa（ 200 psi) To 7 mpa ( 1000 psi) , within the scope of the use of nitrogen to the diameter of 300 mm flowmeter conducted a series of statistics sound velocity measurement. Measurements show that the change of the velocity of sound in this pressure range when calculating the value of 0. Less than 03%. In addition, for temperature and fluid caused by the change of the change of sound velocity, has carried on the further experiments. With natural gas in 21 ℃ ( 70℉） And 10 ℃ ( 50℉） Calibration experiments, with nitrogen in 21 ℃ ( 70℉） And 32 ℃ ( 90℉） Under. For each series of calibration, compared to the average calibration curve, the change on the influence of calibration are obtained. In reproducibility conditions meet the desired device and flowmeter, ultrasonic flowmeter calibration on the variation of velocity, temperature and pressure changes in the reaction. When used in the calibration of the fluid changes from gas to nitrogen, the observed small changes is due to the use of these two kinds of gas state equation. These test results prove that if under the condition of a set of ultrasonic flowmeter calibration procedure is feasible, in the other conditions can also use, including the use of different gas medium. 2, the introduction for related party transactions of natural gas measurement with the principle of ultrasonic flowmeter is determined by measuring the gas ultrasonic transit time. The ultrasonic transmission time in consistent with the direction of flow, less than the situation of the upstream. Under the two states of average transmission time is used to calculate the gas flow rate. Type said: under the actual volume flow available here K = the instrument coefficient of flow meter, delta T = transmission time, the T1 = downstream propagation time, T2 = upstream transmission time due to the flow equation includes only the physics structure size of the flow meter and travel time, it is independent of the flow velocity of gas ( SOS） 。 , therefore, can make a hypothesis: the determination of gas flow velocity is independent of the factors influencing the velocity of sound in the gas, such as temperature, pressure and gas composition. If this hypothesis is not correct, ultrasonic flow meter in the site operation conditions are different from the validity of calibration is worth considering. First of all, for the determination of gas ultrasonic flowmeter speed independent of the speed of sound, but there are still some minor may be due to the following reasons. Acoustic resistance changes the signal for the coupling of the gas; The change of Reynolds number. Reynolds number is proportional to the specific gravity ( SG） With the viscosity ratio; The wavelength of the signal, 王) Changes over gas composition. Keep an eye on these parameters under the different medium is of great interest. The following table is aimed at standard condition, pay attention to the diameter size and velocity, a given Reynolds number is almost a constant. Table 1 gas properties when change from gas to air or nitrogen, many gas properties will change, such as sound velocity, specific gravity and viscosity. However, due to they also vary with temperature and pressure, ultrasonic flow meter in the range of operating conditions on the intrinsic nature of the gas can imagine overlap, suggests that deviates from the standard condition is not so important. 3, the research aim in this article research goal is to determine the temperature, pressure and fluid change on the influence of gas ultrasonic flowmeter. In addition to the inspection technology of ultrasonic flowmeter, the set of programs and to support these gas flowmeter with nitrogen or air calibration. Now, only two sets of equipment are available in North America in the above flow range under the condition of ultrasonic flowmeter calibration diameter greater than 200 mm. The installation of the flowmeter at a speed of more than 10% a year in growth. In the future, the calibration equipment will become a lot of limitations.
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