Precautions for selection, installation and use of turbine flow meter

Abstract: The information on the selection, installation and use of turbine flowmeters is provided by excellent flowmeter and flowmeter manufacturers. Turbine flowmeter is a new type of intelligent instrument that integrates turbine flow sensor and display totalizer developed by using advanced ultra-low power consumption single-chip microcomputer technology. Not subject to outside. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the details of the article on the selection, installation and use of turbine flowmeters. Turbine flowmeter is a new type of intelligent instrument that integrates turbine flow sensor and display totalizer developed by using advanced ultra-low power consumption single-chip microcomputer technology. It has obvious advantages such as being free from external power supply interference, anti-lightning and low cost. Selection of turbine flowmeters The correct selection of turbine flowmeters can ensure better use of turbine flowmeters. What type of turbine flowmeter should be selected should be determined according to the physical and chemical properties of the fluid to be measured? Make the diameter, flow range, lining material, electrode material and output current of the turbine flowmeter suitable for the fluid to be measured. Properties and flow measurement requirements. 1. Accuracy grade and function of precision function inspection The accuracy grade of the instrument is selected according to the measurement requirements and application occasions, so as to be economical and cost-effective. For example, in the case of trade settlement, product handover and energy measurement, a higher accuracy level should be selected, such as 1.0, 0.5, or higher; for process control, different accuracy levels should be selected according to control requirements; some only It is to detect the process flow without precise control and measurement. You can choose a slightly lower accuracy level, such as 1.5, 2.5, or even 4.0. In this case, you can choose a low-cost plug-in turbine flowmeter. 2. Measurable medium The flow rate of the medium, the measuring range and caliber of the instrument can be measured. When measuring the general medium, the full-scale flow rate of the turbine flowmeter can be measured at 0.5 of the medium flow rate.—It is selected within the range of 12m/s, and the range is relatively wide. The specification (diameter) of the selected instrument is not necessarily the same as that of the process pipeline. It should be determined according to whether the measurement flow range is within the range of the flow rate, that is, when the flow rate of the pipeline is too low to meet the requirements of the flow meter or the measurement accuracy cannot be guaranteed at this flow rate, It is necessary to reduce the diameter of the instrument to increase the flow rate in the pipe and obtain satisfactory measurement results. Installation In order to ensure the accurate measurement of the turbine flowmeter, the installation position and method must be correctly selected. Requirements for the straight pipe section: the flowmeter must be installed horizontally on the pipeline (the inclination of the pipeline is within 5), and the axis of the flowmeter should be concentric with the axis of the pipeline during installation. , the flow should be consistent. The length of the upstream pipeline of the flowmeter should have an equal diameter straight pipe section of not less than 2D. If the installation site is allowed, it is recommended that the upstream straight pipe section is 20D and the downstream is 5D. Requirements for piping: The inner diameter of the upstream and downstream piping at the installation point of the flowmeter is the same as the inner diameter of the flowmeter. Requirements for the bypass pipe: In order to ensure that the normal use of the medium is not affected during the maintenance of the flowmeter, a cut-off valve (stop valve) should be installed on the front and rear pipelines of the flowmeter, and a bypass pipe should be set at the same time. The flow control valve should be installed downstream of the flowmeter. When the flowmeter is used, the shut-off valve installed upstream must be fully opened to avoid unstable flow of the fluid in the upstream part. Requirements for the external environment: The flowmeter is best installed indoors. When it must be installed outdoors, sun protection, rain protection and lightning protection measures must be adopted to avoid affecting the service life. Requirements for impurities contained in the medium: In order to ensure the service life of the flowmeter, a filter should be installed before the straight pipe section of the flowmeter. Installation site: The flowmeter should be installed in a place that is easy to maintain and has no strong electromagnetic interference and heat radiation. Requirements for installation and welding: The user should add a pair of standard flanges to be welded on the front and rear pipes. Welding with flow meter is not allowed! Before installing the flowmeter, the welding slag and other dirt in the pipeline should be strictly removed. To ensure that the flowmeter is not damaged during use. When installing the flowmeter, the gasket between the flanges must not be recessed into the pipeline. Requirements for the grounding of the flowmeter: the flowmeter should be grounded reliably and cannot be shared with the ground wire of the strong current system. Requirements for explosion-proof products: For the safe and normal use of the instrument, it is necessary to review whether the use environment of the explosion-proof flowmeter is in line with the user's explosion-proof requirements, and during the installation and use process, the national requirements for the use of explosion-proof products should be strictly observed, and users should not change it by themselves The connection method of the explosion-proof system must not open the instrument at will. The selection is within the specified flow range to prevent overspeed operation to ensure ideal accuracy and normal service life. Before installing the flowmeter, the debris in the pipeline should be cleaned: debris, welding slag, stones, dust, etc. It is recommended to install a filter with a 5 micron mesh upstream to block droplets and sand particles. When the flowmeter is put into operation, the front valve should be opened slowly first, and then the rear valve should be opened to prevent damage to the turbine due to instantaneous airflow impact. Lubricating oil should be operated according to the notice board, and the number of refueling depends on the cleanliness of the temperament, usually 2-3 times a year.

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