Measurement of oil flow

Measurement of oil flow The characteristics of oil flow measurement Oil is the blood of the national economy. Hundreds of millions of tons of oil a year need a large number of flow measuring instruments in various links such as collection, transportation, storage, processing and distribution. Because the characteristics of petroleum in different links are very different, and the purposes of measurement data are also different, so the selection and use of instruments are also very different. Compared with other liquid measurement, oil flow measurement has the following main features. ① There are many varieties of petroleum, and there are great differences among different varieties. Medium and low viscosity petroleum products such as kerosene and diesel oil have low viscosity, low temperature, clean fluid and no strict requirements for measurement. ^High-viscosity oil products such as crude oil, heavy oil, residual oil, etc. have high viscosity and are often heated to a higher temperature for easy transportation. The fluid contains solid impurities and must be strictly filtered before flow measurement. Low-viscosity oil products such as gasoline and liquefied petroleum gas have very low viscosity. ② High measurement accuracy is required. The measurement of oil products used for trade settlement must reach the specified accuracy to ensure the interests of both the supply and demand sides. 08 17167 stipulates that the measurement of gasoline, diesel, and crude oil used for energy consumption assessment of branch factories (workshops) and key energy-consuming equipment should reach an accuracy of 0, 5^; the measurement of gasoline, diesel, and crude oil used for settlement in and out of enterprises should reach an accuracy of 0.35^8 Accuracy, while in the measurement of bulk oil products, the requirements for measurement accuracy are higher and the significance is greater. For example, the crude oil measured by the crude oil transfer metering station is about millions of tons per year, and an error of one thousandth will cause a settlement difference of 1 million yuan per year. ③ On-line real-flow calibration should be considered. The flowmeters used for oil measurement are generally large in diameter, and it is extremely inconvenient to disassemble and send for inspection. Generally, there should be real-flow calibration facilities or an interface for connecting to a standard meter for online real-flow calibration. ④ Mass flow measurement. In most cases, it is settled by mass flow rate. ⑤ The fluid is flammable and explosive.

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