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1. The difference between turbine flowmeter and vortex flowmeter
Turbine flowmeter and vortex flowmeter have significant differences in design principles, application scope, and characteristics, as follows: Design principle Turbine flowmeter: belongs to velocity flowmeter, focusing on measuring liquids. The principle is to use the relationship between the rotational angular velocity of the impeller placed in the liquid and the liquid flow velocity, and calculate the liquid flow rate by measuring the impeller speed. Vortex flowmeter: designed and manufactured based on the Karman vortex principle, using fluid oscillation principle to measure flow rate. When a fluid passes through a vortex sealed flow transmitter in a pipeline, two columns of vortices proportional to the flow velocity will alternate up and down behind the triangular vortex generator. The frequency of vortex release is related to the average velocity of the fluid and the characteristics of the vortex generator. Application scope: Turbine flowmeter is widely used for measuring objects such as petroleum, organic liquids, inorganic liquids, liquefied gas, natural gas, coal gas, and low-temperature flow sensors. Vortex flowmeter: mainly used for flow measurement of industrial pipeline medium fluids, suitable for various media such as gas, liquid, vapor, etc. Characteristics of turbine flowmeter: simple structure, few processed parts, light weight, easy maintenance. Large circulation capacity, with a large amount of flow that can be passed through with the same caliber. Can adapt to high parameter environments such as high temperature, high pressure, and low temperature. Vortex flowmeter: small pressure loss, large range, high accuracy. When measuring
2. Installation and use of turbine flowmeter
The installation and use of turbine flowmeter require strict control from four aspects: the selection of the measured medium, installation piping, signal transmission line configuration, and operation and maintenance, to ensure measurement accuracy and equipment reliability.
. Selection of applicable medium for the tested medium: Turbine flowmeters are suitable for low viscosity (generally less than 15 × 10 ⁻⁶ m ²/s) and low corrosive liquids. For high temperature, high viscosity or highly corrosive media, special measures (such as heating, anti-corrosion treatment) or specialized models should be taken. Viscosity limit: When the viscosity of the medium exceeds 15 × 10 ⁻⁶ m ²/s, real liquid calibration must be performed, otherwise the instrument coefficient error will be significant. Prohibited measurement types: vapor-liquid, gas-solid, and dense solid two-phase flows cannot be measured using a turbine flowmeter, as multiphase flow can damage the stability of turbine rotation. Installation piping requires a straight pipe section: a 20D straight pipe section is required upstream, and a 5D straight pipe section (D is the pipe diameter) is required downstream to eliminate uneven flow velocity distribution and secondary flow effects. Installing rectifiers upstream can further improve accuracy and achieve calibration level measurement accuracy. Filter installation: A silver funnel filter with a stool mu
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