Turbine flowmeter requirements for installation environment

1. Safety The safety of the turbine flowmeter is the main consideration in the selection of the flowmeter, such as the requirements for explosion-proof performance, application in explosive hazardous environments, grouping according to atmosphere adaptability, explosive mixture classification, type of protective electrical equipment, and other safety rules or standards Select a gauge. 2. Compressive strength It is required that the shell should be able to withstand a 5-minute compressive strength test at a test pressure of 1.5 times the maximum working pressure without damage or air leakage. 3. Ambient temperature The electronic components of the instrument and some flow detection parts of the instrument will be affected by changes in the ambient temperature. 4. Environmental humidity High humidity will accelerate atmospheric corrosion and electrolytic corrosion and reduce electrical insulation, and low humidity will easily induce static electricity. Humidity problems caused by sudden changes in ambient or medium temperature. The user should anticipate the range of possible changes and check whether it will cause problems in the operation of the selected instrument. 5. Electrical interference Power cables, motors and electrical switches will all generate electromagnetic interference, which will become the source of errors. Therefore, attention should be paid to prevention or reasonable and effective grounding or shielding of interference sources. 6. Pipeline vibration Some flow meters (such as vortex flowmeters, Coriolis mass flowmeters) are susceptible to vibration interference, so it should be considered to use the pipeline after the label as a reliable support design. Pulsation snubbers can eliminate the effects of pumps and compressors, but should be installed away from vibration or pulsation. 7. Conditions of upstream and downstream pipe sections and requirements for straight pipe sections Most velocity flowmeters, including turbine flowmeters, are more or less affected by the inlet flow conditions, and a good flow velocity distribution must be ensured. Piping arrangements introduce different types of flow disturbances, the most common being velocity profile distortion and eddies. Vortex is generally caused by two or more space bends. These effects can be improved by using an appropriate length of upstream straight pipe section or installing a rectifier to ensure the stability of the flow velocity of the measured pipe section and the full pipe state. 8. Piping layout direction Some turbine flowmeters are installed horizontally and vertically, and there will be differences in measurement performance. For example, the vertical downward flow of fluid brings additional forces to the rotating components of the instrument, which can significantly affect performance, linearity or repeatability. The vertical installation of grounded flowmeters is conducive to the measurement, such as metal tube rotameters. The installation direction of most instruments is stipulated by the manufacturer and should be followed.

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