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Some common factors, which affect the orifice meter scale and improve the precision of the method

by:Sincerity     2020-12-31
Abstract: some common factors, which affect the orifice meter scale and method to improve the accuracy of the information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Standard orifice meter advantages: 1, the standard orifice meter belongs to the throttle a kind of a, is the universal, and recognised by the international standards organization, without real flow calibration, can putting-in-service proactively, in the flow sensor is *; 2, the standard orifice flow. More flow meter manufacturers choose model price quote you are welcome to inquire, here is some common factors, which affect the orifice meter scale and improve the precision of the method the article details. Standard orifice meter advantages: 1, the standard orifice meter belongs to the throttle a kind of a, is the universal, and recognised by the international standards organization, without real flow calibration, can putting-in-service proactively, in the flow sensor is *; 2, the structure of the standard orifice meter is easy to copy, simple, strong, stable and reliable performance, low price; 3, the standard orifice meter application range is wide, including all the single phase fluid ( Liquid, gas, steam) , partially miscible flow, pipe diameter, working state of the general production process ( Temperature and pressure) All can be measured; 4, test piece and the differential display instrument can separate different manufacturer production, and specialized production scale. Second, the faults 1, measurement repeatability, accuracy belongs to medium level in the flow sensor, due to the influence of many factors is complex, precision is difficult to improve; 2, narrow range of degrees, because the flow coefficient and Reynolds number, the general scope of only 3:1 ~ 4:1; 3, have long straight pipe length requirements, generally difficult to satisfy. Especially for large diameter, problems become more prominent; 4, the pressure loss; 5, orifice hole within acute Angle line to ensure accuracy, so the sensor is sensitive to corrosion, wear, scale, dirt, use for a long time to guarantee the accuracy need to remove the strong checked once a year; 6, use flange connection, easy to run, run, drip, leak problems, greatly increases the maintenance workload. By orifice flow timing, the orifice plate processing technical requirements are very strict, must conform to the state standards or the stipulations in the ministerial standard, otherwise, will bring error to natural gas flow measurement result. ( 1) Protruding out of the throttle device: throttling device inserted into the gasket, weld and so on also can make the flow measurement produce certain error, error of the size and the location of the protrusions, orifice plate and the distance of the protrusions, and the level of outstanding. The experiment proved that when & beta; = 0. 7, highlight the object is located in the upstream 2 times the diameter of orifice, the resulting error zui; If the protrusion is located at upstream orifice, the error is 16% ~ 50%, if the protrusion is located in the downstream of the orifice plate, the smaller the impact on the accuracy of measuring. ( 2) Orifice plate bending: due to improper installation or maintenance, bending or deformation in the orifice plate, lead to the flow measurement error is bigger. On the orifice flange take pressure test result, zui big errors caused by orifice plate bending is about 3. 5%. ( 3) Eccentric orifice plate: experiments show that the measurement error caused by the eccentric orifice plate is in commonly 2%, aperture ratio & beta; The higher the value, the greater the eccentricity influence, so, should avoid to use & beta; High value of the orifice plate. ( 4) Length of straight pipe before and after must meet the requirements, the distance of the five after the top 10, and must meet the requirements of on-site installation, otherwise the measuring results of flowmeter may cause a large error. Improve the accuracy of orifice flowmeter metering way ( 1) Pipeline requirements: national standards within the length of the measuring tube, straight tube, roundness and surface roughness has a strict technical requirements. When measuring tube zui small length can not meet the requirement of the standard, will bring the flow measurement result deviation, its size and aperture ratio & beta; And Reynolds number, so must be installed on the straight pipe in front of the orifice plate rectifier, to ensure the accuracy of measurement. ( 2) Installation requirements: orifice entrance end face must be perpendicular to the pipe axis, the deviation is no more than 1 degree. Installation should pay attention to the direction of the load pipeline orifice, it is strictly prohibited to the outfit, must conform to the standard requirement for not alignment tolerance. Between the flanges, orifice plate and take pressure device sealing gasket thickness shall not be greater than zero. 03D 。 The installation of the gasket may not penetrate in the straight pipe or inner cavity pressure device, shall not take blocking caused by pressure and change the position of pressure. New station must be in the pipeline purging and run a few days later, then install to the throttling orifice plate device, in order to avoid the orifice plate is in the gas liquid and solid impurity damage or pollution. To correctly choose and use differential pressure gauge, differential pressure measurement bout, flow is small, the differential gauge work under 30%, can greatly reduce the flow measurement accuracy, when measuring flow decrease, to timely replace the differential gauge range spring or orifice plate specification, otherwise, the differential error will be multiplied. Which affect measurement accuracy of orifice flowmeter is driven by the throttle device geometry and flow state is deviating from the design standards. In actual use, therefore, should be in strict accordance with the design requirements of the throttle device regularly, orifice plate, double corrugated differential gauge for inspection and adjustment, so as to reduce the measurement error, ensure the accuracy of measuring. Nanjing jinnuo instrument, is specializing in the production of standard orifice flow meter series, series of nozzle flowmeter; Venturi meter series, v cone series, series of cross section of flow meter manufacturers. Welcome all over the country the pains friends come to visit. Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.
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