Gas turbine flow meter selection
The selection of gas turbine flowmeter can be considered from the following aspects:
1. Accuracy level: Generally speaking, the selection of turbine flowmeter is mainly due to its high precision, but the higher the accuracy of the flowmeter, the more sensitive to changes in the field conditions of use, so the accuracy of the turbine flowmeter should be carefully selected, and should be considered from an economic perspective. For the trade settlement instrument of the large-caliber gas transmission pipeline, it is cost-effective to invest more in the instrument, and for the occasion of small throughput, the medium precision level can be selected.
2. Flow range: The choice of flow range of the turbine flowmeter has a greater impact on the accuracy and service life of its gas turbine flowmeter, and each caliber of flowmeter has a certain measuring range, and the choice of flowmeter caliber is also determined by the flow range. The principle of selecting the flow range is: the small flow when used shall not be lower than the small flow allowed by the instrument, and the large flow when used shall not be higher than the large flow allowed by the instrument. Gas turbine
For discontinuous working occasions where the actual running time of the daily instrument does not exceed 8 hours, 1.3 times the maximum flow rate in actual use is selected as the upper limit of the flow range; For continuous work occasions where the actual running time of the instrument is not less than 8 hours per day, 1.4 times the maximum flow rate in actual use is selected as the upper limit of the flow range. The lower limit flow rate of the instrument should be 0.8 times of the actual small flow rate.
3. Gas density: The main influence on gas turbine flowmeter and fluid physical properties is gas density, which has a greater impact on the instrument coefficient, and is mainly in the low flow area. If the gas density changes frequently, the flow coefficient of the flowmeter should be corrected.
4. Pressure loss: try to choose gas turbine flowmeter with small pressure loss. Because the pressure loss of the fluid through the turbine flow meter is smaller, the energy consumed by the fluid from the input to the output pipeline is less, that is, the total power required will be reduced, which can greatly save energy, reduce transmission costs, and improve utilization.
