Problems encountered during use of liquid turbine flowmeters
2019-09-09 15:04:52
Liquid turbine flowmeter has a simple structure, light weight, easy maintenance, processing parts and flow capacity, has been widely used in petrochemicals, organic liquids, inorganic liquids, cryogenic liquids, high temperature liquids and other industries. However, in practice, problems such as the properties of the measured medium, the selection of the aperture, the installation conditions, and maintenance calibrations are inevitable. To ensure the normal operation of the turbine flowmeter, the following issues should be noted during its use:
1. Turbine flowmeters have strict requirements on the measured medium. Turbine flowmeters are generally only required for the measurement of low-viscosity, one-way fluids. Most of the current turbine flowmeter bearings are ball bearings, so the cleanliness of the measured medium is Very high requirements, such as particles containing impurities in the medium, will cause rapid wear of the bearing, if it contains fiber impurities will be wrapped around the turbine blade, affecting the normal rotation of the turbine, in practical applications can be installed in front of the turbine flow meter effective filter.
2. Selection of Turbine Flowmeter Diameter When selecting the diameter of the turbine flowmeter, the operating condition of the medium should be within 15%-70% of the flowmeter measurement range, when the measured medium flow is at the selected flow rate. When the measurement range is less than 15%, the flow rate of the medium fluid in the pipe is slowly in the laminar state, and the linearity of the measurement of the flowmeter is deteriorated, and it is difficult to achieve the required measurement accuracy. When the media operating flow is greater than 70% of the selected flow meter measurement range, the turbine speed will become very large, accelerating the wear of bearings and brackets, affecting the service life of the turbine meter.
3. Problems with the installation of liquid turbine flowmeters The uneven distribution of medium fluid velocity and vortex flow are the main factors affecting the measurement accuracy of turbine flowmeters. To eliminate uneven flow velocity and swirl flow, it is necessary to have long enough flow in the front section of the turbine flowmeter. Straight section. General requirements on the turbine flow meter to leave more than 15D straight pipe, 4D straight pipe downstream to ensure the accuracy of the measurement, if the installation site is limited by the upstream can not meet its requirements, can be installed in the upper straight pipe on the pipe-speed rectifier. Turbine flowmeters can be mounted horizontally, inclinedly, or vertically, depending on the installation method, and their flow characteristic curves may vary. For high-precision measurements, horizontal mounting must be used. If it is necessary to use a vertical installation, use the vertical mounting method to recalibrate the turbine flowmeter and reset the meter factor.
4. Maintenance and calibration of liquid turbine flowmeters should pay attention to the problem Most turbine turbine flowmeter turbine bearing wear and impeller is stuck, this type of failure users only need to replace the bearing or remove the debris on the impeller can be solved, but Turbine flowmeters are precision instruments that are tightly packed. Changing the fittings or reassembling them will cause changes in the meter factor. Therefore, to ensure the accuracy of the measurements, you must recheck and change the meter factor after replacing parts or reassembling. CAUTION Verify that the fluid media used must be the same media or media with similar viscosity as the measured media.
Liquid turbine flowmeter
1. Turbine flowmeters have strict requirements on the measured medium. Turbine flowmeters are generally only required for the measurement of low-viscosity, one-way fluids. Most of the current turbine flowmeter bearings are ball bearings, so the cleanliness of the measured medium is Very high requirements, such as particles containing impurities in the medium, will cause rapid wear of the bearing, if it contains fiber impurities will be wrapped around the turbine blade, affecting the normal rotation of the turbine, in practical applications can be installed in front of the turbine flow meter effective filter.
2. Selection of Turbine Flowmeter Diameter When selecting the diameter of the turbine flowmeter, the operating condition of the medium should be within 15%-70% of the flowmeter measurement range, when the measured medium flow is at the selected flow rate. When the measurement range is less than 15%, the flow rate of the medium fluid in the pipe is slowly in the laminar state, and the linearity of the measurement of the flowmeter is deteriorated, and it is difficult to achieve the required measurement accuracy. When the media operating flow is greater than 70% of the selected flow meter measurement range, the turbine speed will become very large, accelerating the wear of bearings and brackets, affecting the service life of the turbine meter.
3. Problems with the installation of liquid turbine flowmeters The uneven distribution of medium fluid velocity and vortex flow are the main factors affecting the measurement accuracy of turbine flowmeters. To eliminate uneven flow velocity and swirl flow, it is necessary to have long enough flow in the front section of the turbine flowmeter. Straight section. General requirements on the turbine flow meter to leave more than 15D straight pipe, 4D straight pipe downstream to ensure the accuracy of the measurement, if the installation site is limited by the upstream can not meet its requirements, can be installed in the upper straight pipe on the pipe-speed rectifier. Turbine flowmeters can be mounted horizontally, inclinedly, or vertically, depending on the installation method, and their flow characteristic curves may vary. For high-precision measurements, horizontal mounting must be used. If it is necessary to use a vertical installation, use the vertical mounting method to recalibrate the turbine flowmeter and reset the meter factor.
4. Maintenance and calibration of liquid turbine flowmeters should pay attention to the problem Most turbine turbine flowmeter turbine bearing wear and impeller is stuck, this type of failure users only need to replace the bearing or remove the debris on the impeller can be solved, but Turbine flowmeters are precision instruments that are tightly packed. Changing the fittings or reassembling them will cause changes in the meter factor. Therefore, to ensure the accuracy of the measurements, you must recheck and change the meter factor after replacing parts or reassembling. CAUTION Verify that the fluid media used must be the same media or media with similar viscosity as the measured media.
Liquid turbine flowmeter
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