Common sense of use of orifice flow meter

Abstract: The common sense information for the use of orifice flowmeters is provided by excellent flowmeter and flowmeter manufacturers. The throttling device type in the flow meter refers to a measurement system that uses an orifice plate, a nozzle, and a Venturi tube to measure the flow of a full-circle tube. The system generally consists of a throttling device, a differential pressure gauge and a data processor (square root calculator or computer). This flow measurement system. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the common sense article on the use of orifice flowmeters. The throttling device type in the flow meter refers to a measurement system that uses an orifice plate, a nozzle, and a Venturi tube to measure the flow of a full-circle tube. The system generally consists of a throttling device, a differential pressure gauge and a data processor (square root calculator or computer). The characteristics of this flow measurement system are: 1. The principle and theoretical research are very mature; 2. The degree of standardization is high, with GB/2624 and ISO5167 standard documents; 3. The structure is simple, the cost is low, and the maintenance and use costs are low; 4. Strong adaptability to the environment ; 5 Higher measurement accuracy can be obtained if the maintenance management is correct. These characteristics are unmatched by other forms of flowmeters, so the throttling device-type flowmeter occupies a relatively high proportion in the flow measurement, which is estimated to be about 80%. In recent years, although some new flow meters have been put on the market, due to the reasons of structure, cost, use conditions, etc., the status of throttling device type flow meters in flow measurement cannot be shaken. Therefore, the correct use and maintenance of this measurement system is still one of the issues that automation instrument professionals must pay attention to. 1. Status of maintenance and use of throttling device type flow measurement system Most of the throttling device type flow measurement systems in use are limited to the management and maintenance of hardware due to the limitation of the professional and technical level of maintenance personnel. The main content of hardware management and maintenance is to check whether there is any leakage or blockage in the pulse pressure pipe valve of the throttling device, whether the differential pressure gauge and data processor are working normally, and check them regularly. If no problems are found in the above maintenance checks, even if the data displayed by the system has obvious deviations, the system is generally considered to be normal. Since I have been engaged in the management of flow measurement for many years, I think that the use and maintenance of the throttling device-type flow measurement system is far from enough to only manage and maintain the hardware, and more importantly, it is necessary to perform soft maintenance on the system. The so-called soft maintenance is to track, analyze, study and calculate the operating parameters of the throttling device-type flow measurement system, and correct the technical parameters of the system according to the calculation results. Soft maintenance is a process of making system technical parameters close to actual operating conditions. Second, the necessity of soft maintenance For any set of throttling device type flow measurement system, its design calculation is calculated according to the medium type, temperature, pressure, flow, pipeline geometry and other working parameters provided by the buyer. That is, a set of throttling device is calculated, designed and manufactured according to a set of parameters provided by the buyer. The system can only ensure that the measurement uncertainty is within the specified range if the set of throttling device operates under the working conditions used in the design and calculation. If the actual operating conditions deviate from the design conditions, the system measurement data cannot guarantee that the uncertainty is within the specified range. However, most of the throttling device-type flow measurement systems in actual use are different from the design conditions, and some are even very different. Therefore, soft maintenance must be carried out, and this soft maintenance should run through the whole process of system use. 3. The influence of the deviation between the operating conditions and the design conditions on the uncertainty of the system 1. The actual operating flow value deviates from the design value The actual operating flow value deviates from the design flow value, which is a frequent problem. In most cases, the design flow rate is higher, and the actual operating flow rate is lower. The main reasons for the influence on the uncertainty of the system are: (1) Since the uncertainty of the throttling device is calculated according to the common flow rate, the common flow rate is generally about 70~80% of the calibrated flow rate. It will cause a large change in the flow coefficient C, and the uncertainty will increase. (2) The uncertainty of the differential pressure gauge is calculated according to the reference error. The above is the entire content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Common sense of use of orifice flow meter'

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