Effectively avoid errors in natural gas flow metering

Abstract: The information that can effectively avoid the error of natural gas flow meter measurement is provided by excellent flow meter and flow meter manufacturers. There are three methods of natural gas flow measurement: volume flow measurement, mass flow measurement and energy flow measurement. Traditional natural gas measurement uses volumetric unit measurement. Measurement in mass and energy units has become a trend in recent years. High capacity. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the article that can effectively avoid errors in the measurement of natural gas flowmeters. There are three methods of natural gas flow measurement: volume flow measurement, mass flow measurement and energy flow measurement. Traditional natural gas measurement uses volumetric unit measurement. Measurement in mass and energy units has become a trend in recent years. Energy or mass units are preferentially used in the metering of large-capacity, high-pressure natural gas. my country did not pay enough attention to natural gas measurement in the early days, and the development of natural gas measurement technology was slow. Up to now, the measurement of natural gas commodities still adopts the volume measurement method. At present, natural gas volumetric flow meters mainly include orifice flowmeters, vortex flowmeters, turbine flowmeters and positive displacement flowmeters. Standard orifice flowmeters are widely used. 1. Problems in measurement Standard orifice flowmeter is an indirect technical measurement of comprehensive parameters. There are many instruments used and the influencing factors are complex. Under normal circumstances, its measurement accuracy can meet the requirements of GB2624-93 standard and SY/T6143-1996 standard orifice measurement method standard for natural gas flow. In actual work, the impact of deviation from the conditions specified in the standard on the measurement accuracy can be quantitatively estimated and corrected, and some can only qualitatively estimate the uncertain amplitude and direction, but some are deviated from multiple conditions at the same time, which is A very complex situation arises. Because the general literature only describes the error caused by the deviation of a certain condition, there is a lack of relevant information on the measurement error when multiple conditions deviate at the same time. A large number of on-site investigations and practical experience show that the main reason for metering problems is that the design, manufacture, installation and use of the throttling device and the working conditions deviate from the scope of the standard. Its main manifestations are as follows: The design, manufacture and installation are not strictly in accordance with the SY/T6143-1996 standard. The diameter of the measuring pipe is too large, and it has been in a low Reynolds integer for a long time. The upstream and downstream pipe sections are not installed and matched according to the standard requirements, and the inner diameter of the pipe has not been measured. Orifice flowmeter is designed with relatively stable flow rate parameters, and the flow rate is too small or too large will increase the measurement error. To correctly select and use the differential pressure gauge, if the working range of the differential pressure gauge is below 30%, the flow measurement accuracy will be greatly reduced. When the natural gas flow decreases, the range or orifice plate specification of the differential pressure gauge should be replaced in time, otherwise the measurement error due to differential pressure will increase exponentially. When selecting the differential pressure range of the instrument, it is necessary to consider not only the aperture ratio, but also whether the pressure after the pressure loss of the orifice plate meets the production needs. The value of the aperture ratio of flange pressure and corner connection pressure should be between 0.2 and 0.75, and generally should be selected between 0.4 and 0.6, so that the measurement accuracy can be ensured and the pressure loss can be reduced. 2. Accumulation scheme using special flow computer The special accumulation scheme adopts modern mathematical computer technology, which can accurately calculate various flows (volume flow and mass flow) according to the requirements of users, and automatically and continuously perform full compensation or partial flow on the flow. Compensation, as long as the formula of each coefficient in the flow equation is programmed according to certain requirements, the purpose of accurately accumulating the flow can be achieved. 3. Adopt exchangeable orifice plate device and fixed value throttle device. The exchangeable orifice plate throttle device is a new type of throttle device with a major breakthrough in structure. The throttle element is precisely installed in the fixed seat (the seat body passing method The orifice plate can be easily lifted for inspection, cleaning or replacement without dismantling the pipeline or non-stop transmission, thus ensuring the accuracy of measurement. The orifice plate is easily lifted by the hydraulic lifting device, especially suitable for the large-diameter orifice plate. This throttling device is also equipped with a cleaning mechanism, which can eliminate the fouling medium and provide an effective means for the accurate measurement of natural gas in a single well. The fixed value throttling device changes the existing throttling device. According to the method of processing its aperture according to the calculation results, each nominal diameter pipe is equipped with a throttle with limited aperture, and the aperture series is selected according to the priority factor. The use of constant-value throttling device is conducive to mass production of products and reduces production costs. The matching of the replaceable orifice throttling device and the fixed value orifice will change the traditional production method, realize the serialization, generalization and standardization of the throttling device product, which is conducive to improving the measurement accuracy of the throttling device. The above is the whole content of this article , You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Effectively avoid errors in natural gas flow metering'

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