How to check the orifice flow meter after long-term use

Abstract: The information on how to check the orifice flowmeter after long-term use is provided by the excellent flowmeter and flowmeter manufacturers. Whether the orifice flowmeter can operate reliably and meet the requirements of design accuracy, it is very important to use it correctly. Although the design, manufacture and installation of the flowmeter all meet the requirements of the standard, if you do not pay attention to the use of the problem, it may be used in vain. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is how to check the article details after long-term use of the orifice flowmeter. Whether the orifice flowmeter can operate reliably and meet the requirements of design accuracy, it is very important to use it correctly. Although the design, manufacture and installation of the flowmeter all meet the requirements of the standard, if you do not pay attention to the use of the problem, you may lose all your efforts and fail to use. The working conditions specified by the standard of the orifice flowmeter are the so-called reference working conditions. These conditions can be satisfied in the laboratory, but it is difficult to fully meet them in the field. It can be said that deviation from the standard requirements is inevitable. At this time, it is important to Estimating the degree of deviation, it is best if it can be properly compensated (corrected), otherwise the estimated measurement error should be increased. The orifice flowmeter is installed in the harsh workplace on site. After long-term operation, some changes will occur in the pipeline or throttling device, such as blockage, scaling, wear, corrosion, etc. The detection part relies on the structural shape and size to maintain the accuracy of the signal, so any changes in the geometry and size will bring additional errors. Trouble is, the change in measurement error is not perceptible from the signal, so regular inspection of the test piece is necessary. The inspection period can be determined according to the condition of the measuring medium. The length of the period cannot be uniformly specified. Users should determine it according to their own specific conditions, and some may need to explore for a period of time to master. The design calculation task book requires the user to fill in the operating conditions in detail. It is inevitable that these conditions will change after the instrument is put into use, because it is difficult for the designer to estimate some variables of the process; such as pressure and temperature fluctuations. It is normal for some technological processes to change after being put into use and running for a period of time. In addition, there is often a gradual increase in production output. All of the above will change the physical parameters of the measured medium. At this time, the user should check the process parameters in time, correct the instrument or take some measures, such as replacing the throttling part, adjusting the range of the differential pressure transmitter and so on. How to check and find problems after long-term use of orifice flowmeter: (1) Deviation of structure: a. Sharpness of right angle of orifice inlet; b. thickness of throttle; c. flatness of upstream end face of throttle; d. position of pressure taking ;e. Improper processing or blockage of the pressure tap; f. The diameter of the pipe does not match the calculated value; g. Steps and dislocations occur near the throttle; h. The size of the ring chamber is inconsistent, resulting in steps or eccentricity; i. The seam protrudes; j. The throttling piece is eccentric (large non-axial). (2) Deviation of pipeline arrangement: a. The choke is close to the throttling device. The types of chokes are very complex, there are single chokes and combined chokes. The standard only gives several types of chokes, and there is still a lack of test data for combined chokes; b. The application of flow regulators makes entry The flow of the throttling element is to fully develop the pipe flow, but it cannot be used arbitrarily. (3) Deviation from use: a. Orifice plate is bent (deformed); b. Dirt deposits on the upstream end face of the throttling part; c. Dirt deposits on the upstream measuring tube of the throttling part; e. Changes in the inner surface roughness of the venturi. (4) Influence of pipe wall roughness: a. The increase of pipe wall roughness makes the flow velocity distribution curve steeper and increases the outflow coefficient; b. Corrosion, scaling, etc., change with time. The orifice flowmeter is an instrument that calculates the flow according to the differential pressure generated by the interaction between the flow detection element installed in the pipeline and the fluid, the known fluid conditions and the geometric dimensions of the detection element and the pipeline. It consists of a primary device (detection piece) and a secondary device (differential pressure converter and flow display instrument). Differential pressure flowmeters are usually classified in the form of test pieces, such as orifice flowmeters, Venturi flowmeters, uniform velocity tube flowmeters, Pitot tube principle type-Pitoba flowmeters, etc. The secondary devices are various mechanical, electronic and electromechanical integrated differential pressure gauges, differential pressure transmitters and flow display instruments. It has been developed into a large class of instruments with a high degree of triadization (serialization, generalization and standardization) and a large variety of specifications. It can measure both flow parameters and other parameters (such as pressure, level, density, etc. ). The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'How to check the orifice flow meter after long-term use'

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