How to choose the right flowmeter

①Select the appropriate flow meter coefficient X. Since the meter coefficients of each verification point of the flowmeter are not exactly the same within the full range, and the flowmeter is usually used under the condition of a basically fixed instantaneous flow rate, the flowmeter coefficient X should be selected according to this common flow rate. If the positive displacement flowmeter has no instantaneous flow display, it can be calculated by dividing the total amount in a certain period of time by the time period. ② Use the average error of the flowmeter to calculate the difference. The flowmeter coefficient X in the formula for calculating the crude oil volume is the flowmeter coefficient X on the flowmeter verification certificate! Value and the arithmetic mean of the flowmeter coefficient ^ before the next verification without adjustment, that is, the average coefficient of the flowmeter during operation. For example, ',' is the relative error of the flowmeter at the common flow point. Then the average error of the flowmeter during operation During this period, the accumulative metered oil volume of the flowmeter will affect the wear of the flowmeter coefficient adjustment meter during the verification. When the positive displacement flowmeter is used to measure fluids that are prone to wear and cause low indications such as crude oil, the successive verification data are accumulated, and the rate of low indications changing with time is analyzed and calculated. When the properties of the measured fluid are basically unchanged Under certain circumstances, the deviation of the indication value at the next verification can be estimated, so that when X is adjusted in this verification, it will have an optimal 'positive' deviation on the premise that the flowmeter is qualified. The value should be half the amount of under-indication due to wear during the intended operating cycle to reduce disputes.

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