The improvement of the accuracy of the steam flow meter can start from these points

Abstract: The improvement of the accuracy of the steam flow meter can start from these points. The information is provided by the excellent flow meter and flow meter manufacturers and quotation manufacturers. Steam flowmeters are widely used in petroleum and chemical industries, but the measurement accuracy of steam has always been a difficult point in measurement. At present, there are many misunderstandings among many users, thinking that the brand is loud and high-quality steam flowmeter can be guaranteed. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the article to improve the accuracy of steam flowmeters. Steam flowmeters are widely used in petroleum and chemical industries, but the measurement accuracy of steam has always been a difficult point in measurement. At present, there are many misunderstandings among many users. They think that only a high-quality steam flow meter can ensure the accuracy of measurement. In fact, this is a rather one-sided idea, which will ignore the dependence on the actual situation and increase the accounting cost. In fact, the measurement of steam flow is affected by many factors. A series of measures to effectively improve the accuracy of steam flowmeters: Flowmeters suitable for steam applications include: steam flowmeters, orifice flowmeters, turbine flowmeters (including bypass flowmeters), variable volume flowmeters, and bomb load variable flowmeters. And the cumulative flow meter, direct online (DIVA) variable to the cumulative flow meter, Pitot tube flowmeter and vortex flow meter. Orifice flowmeter has the advantages of simple structure, high precision and low wood formation, so it is widely used. When the steam flowmeter uses the standard throttling device to measure the steam flow, it must be strictly in accordance with SY/T6143—Design, manufacture, inspect, install and use the standard orifice plate throttling device according to the technical indicators stipulated in the 2004 standard. The right-angle edge of the orifice plate will be worn out by medium scouring for a long time, especially the medium with impurities is more serious, which will affect the accuracy of the orifice plate flowmeter. This should be done regularly. Check the roughness. 1. Guarantee of the length of the straight pipe section before and after the orifice plate The correct selection is the premise to ensure the accuracy of the steam flowmeter, which needs to consider the factors of medium type, medium state, medium temperature, pipe diameter, installation method and output signal. Once the type is selected, special attention should be paid to providing sufficient straight pipe sections upstream and downstream of the orifice flowmeter during installation, which can prevent the flow pattern of the medium from being disturbed. When determining the requirements for the length of the straight pipe section on the upstream side of the throttling piece, it should be considered in three ways. First, consider whether the upstream side of the throttling piece and the straight pipe section of the throttling piece meet the requirements; secondly, consider the upstream side of the throttling piece. Whether the distance of the straight pipe section between the side choke piece and the second choke piece meets the requirements; then consider whether the straight pipe section between each choke piece above the second choke piece and the orifice plate meets the requirements. When determining the requirements for the length of the straight pipe section on the downstream side of the throttling piece, the steam flowmeter only needs to consider whether the choking piece on the downstream side of the throttling piece and the straight pipe section of the throttling piece meet the requirements. When the length of the straight pipe section is less than zero additional uncertainty value, and is equal to or less than 0.5% additional uncertainty value, the measurement uncertainty of the throttling device shall be arithmetically added by 0.5%. 2. The surface roughness of the straight pipe section The surface roughness of the straight pipe section of the orifice plate, standard nozzle, long-diameter nozzle, and Venturi nozzle refers to the regulations on roughness within 10D upstream of the throttle. The roughness of the inner surface of the upstream pipe of the steam flow meter orifice plate should meet the requirements. The upstream pipe buckle pair roughness Ra/D is at least equal to the length of 2D upstream of the classic venturi<=3.2*10-4. 3. The roundness of the pipeline is within the required length of the short straight pipe section, and the pipeline must be cross-sectional and must be round. The straight pipe section can be a seamed steel pipe, but the internal weld is parallel to the axis of the pipe and meets the special requirements of all throttling parts for the pipe. The height of the weld seam is not greater than the allowable step. Welds shall not be located at the center of any single pressure tap 30°within the sector. The replacement orifice throttling device is a new type of throttling device, and the throttling element is precisely installed in the fixed seat (the seat is connected with the pipeline through the flange) ), the orifice plate can be easily lifted for inspection, cleaning or replacement without removing the pipeline or stopping the fluid delivery, thus ensuring the accuracy of the juice amount. The steam flowmeter adopts a hydraulic lifting device, and the orifice plate can be easily lifted, especially suitable for large-diameter orifice plates. This negative flow equipment W is also equipped with a cleaning chamber and a cleaning mechanism, which provides an effective means for solving the fouling medium, especially for the accurate measurement of steam. The fixed-value throttling device changes the method of processing the aperture of the existing throttling device according to the calculation results. Each diameter measuring pipe is equipped with a limited number of throttling parts, and the aperture series is selected according to the priority number system. Equipped with 35 orifice plates with different aperture ratios (3 values). 4. Adopt a reasonable flow accumulation scheme. According to the steam metering working conditions, the steam flowmeter should adopt the integral calculation of pressure, temperature and flow with partial compensation or full compensation The scheme uses intelligent differential pressure transmitter, pressure transmitter, temperature transmitter and flow computer to form an online detection system, so that the temperature and pressure changes can be compensated, which can improve the measurement accuracy of the steam flowmeter and reduce the flow pulsation ( or fluctuations) additional errors in flow measurement.

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