Five aspects of gas turbine flowmeter selection

The gas turbine flowmeter is a new generation of high-precision, high-reliability gas precision instruments, with excellent low and high pressure metering performance, multiple signal output methods and low sensitivity to fluid disturbances. It has been widely used in natural gas. Measure gases such as coal gas, liquefied petroleum gas and light hydrocarbon gas. Gas turbine flowmeters need to pay attention to several important factors in the selection process, because they will not become loose due to measurement effects and stable operation.

The selection of gas turbine flowmeter should be considered from the following aspects:

1. Accuracy level: Generally speaking, the choice of turbine flowmeter is mainly due to its high accuracy, but the higher the accuracy of the flowmeter, the more sensitive it is to changes in site conditions. Therefore, the accuracy of the meter should be selected. To be cautious, it should be considered from an economic point of view.

2. Flow range: The selection of the flow range of the turbine flowmeter has a great influence on its accuracy and service life. Each flowmeter has a certain measurement range. The choice of flowmeter diameter also depends on the flow range. . The principle of selecting the flow range is that the smaller flow during use should not be lower than the smaller flow allowed by the flowmeter, and the larger flow during use should not be higher than the larger flow allowed by the flowmeter.

3. Gas density: For gas turbine flowmeters, the main influence of fluid properties is gas density, which has a great influence on the meter coefficient, mainly in the low flow area. If the gas density changes frequently, corrective measures should be taken for the flow coefficient of the flowmeter.

4. Pressure loss: try to use a turbine flowmeter with low pressure loss. Because the smaller the pressure loss of the fluid passing through the turbine flowmeter, the less energy the fluid consumes from the input to the output pipeline, that is, the total power required will be reduced, thereby saving energy, reducing transportation costs, and improving utilization. .

5. Structure type: (1) The internal structure should adopt reverse thrust turbine flowmeter. Because the reverse thrust structure can make the impeller in a floating state within a certain flow range, there is no contact point in the axial direction, no end face friction and wear, and the service life of the bearing can be prolonged. (2) According to the pipe connection method, the flowmeter has two horizontal and vertical installation methods. The horizontal installation and pipe connection methods are flange connection, threaded connection and clamp connection.