Introduction to crude oil flow meter scale selection

Abstract: introduction to crude oil flow meter scale selection information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. One, the preface flowmeter is zui oil enterprise commonly used instrument, a lot of production in oilfield site selection is not reasonable, the use of flowmeter exist some installation errors, caused by measurement error is too large, and some can't meet the production or need to transfer metering of crude oil. More flow meter manufacturers choose model price quote you are welcome to inquire, here is a discussion on crude oil flow meter scale selection article details. One, the preface flowmeter is zui oil enterprise commonly used instrument, a lot of production in oilfield site selection is not reasonable, the use of flowmeter exist some installation errors, caused by measurement error is too large, and some can't meet the needs of the production or transfer metering of crude oil. Many forms of flowmeter can measure the crude oil, but only on experience and only consider when the choice selection of purchase expense, may lose the opportunity to choose zui suitable instrument. Such as the instrument of flow range and the actual traffic do not match, low requirements for measuring the place with high precision instrument and so on. Thus correct selection and use of the flowmeter is not always easy. To correctly and effectively select crude oil flowmeter, it is necessary to consider the following five factors, namely, performance requirements, crude oil physical properties, installation requirements, environmental conditions, and costs. Second, flowmeter performance requirements select flowmeter on performance requirements to consider are: the content of the instantaneous flow and cumulative flow, accuracy, repeatability, linearity and flow range and scope of degree, the pressure loss, output signal characteristics and response time, etc. Different measurement purposes, has different choice on flowmeter performance. Such as crude oil trade settlement measurement of precision demand is higher; Continuous measurement process control usually require good reliability and repeatability, sometimes also requires a wide range of degrees, the measuring accuracy requirement should be on the back burner; Oilfield production site does not require the flow meter is of high accuracy, but the working condition of crude oil physical property and good adaptability. Volumetric flowmeter normally with mechanical or pulse frequency output, directly by the accumulative flow rate, high accuracy, suitable for measuring the total, if you need the output instantaneous flow should be equipped with corresponding transmission device. Electromagnetic flowmeter, ultrasonic flowmeter, etc on the principle is based on measuring the medium velocity flow is deduced, fast response, suitable for process control ( Such as leakage alarm) , by integrating the total flow can be obtained. Should be considered while selecting a flowmeter measurement accuracy, the production site production process required by the flow measurement range, is in the range to ensure accuracy, production or management requirements flowmeter calibration cycle, whether to live online real fluid test, the flow stress level, explosion-proof level, etc. Such as both traffic measurement and application in the fluid flow control system, such as flow meter as both transfer metering of crude oil, and to consider the crude oil pipeline leakage alarm device, signal collection flowmeter accuracy of sure you want to in the whole system under the control accuracy requirement, because the whole system not only has the traffic detection error, also contains a signal transmission, control error and various influence factors, such as operation links often have certain error, the measuring instrument to determine the high precision is not reasonable and not economic. Meter specifications to determine the level of accuracy is within a certain range of traffic, if used within the specified scope, the general accuracy guaranteed, in excess of the prescribed flow range, the actual accuracy is lower than nominal value, determination of traffic below flowmeter zui small measured values that may flow meter does not start, usually the use of the meter should be used in the nominal range of 30% ~ 80%. For trade settlement requires high accuracy, generally should not be less than zero. Should also be considered, level 2 accuracy of persistence, and the relationship between the verification cycle, can ensure qualified throughout the test cycle. Flowmeter pressure level should be higher than the process requirements of the pressure level one order of magnitude, such as technological process of 4 mpa, selection of flowmeter in general should be 6. 4MPa。 Crude oil flow meter shall have explosion-proof function and explosion-proof grade should satisfy oil and gas station, library design specifications and safety requirements. Repeatability is an important index in the process control application, principle and manufacturing quality is decided by the meter itself, but in practical applications, the flow meter of repetitive around by many factors such as crude oil viscosity, density, electromagnetic interference, so require repetitive good place, should not choose environment, medium and conditions affect sensitive flow meter. Sizing of flowmeter should be used according to the measured pipe flow range and limit of selected meter, flow and lower limit flow matching, and should not simply in accordance with the duct sizes to choose. Usually designed pipeline fluid zui is according to the economic flow rate to determine the flow velocity. Because of low velocity selection, large diameter thick investment; High velocity transmission power is big, to increase the operation cost. Most flowmeter limit flow velocity is close to or slightly higher than the pipe economic flow velocity, so the possibility of flowmeter sizes the same as the pipe diameter is larger, installation is more convenient, also should not differ too much, if not the same general adjacent to a specification, using variable diameter tube connection. Flow meter range for maximum flow and the ratio of minimum flow, its value is larger the wide flow range.

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