How to choose the right gas turbine flowmeter

Time: 2024-07-16
Equipment Configuration:gas turbine flowmeter

Gas turbine flowmeter is widely used in the metering of natural gas, coal gas, liquefied gas, light hydrocarbon gas and other gases, with excellent low and high pressure metering performance, a variety of signal output methods and low sensitivity to fluid disturbances and so on.

Project Overview

Users in the selection, should be based on the nominal pressure of the pipeline, the maximum pressure of the medium, the media temperature, media components, flow range and signal output requirements for a reasonable choice of flowmeter model specifications. The following is a brief introduction to how to carry out the selection of gas turbine flowmeter.

  • 1、Accuracy level: Compared with other flow meters that can measure gas media such as vortex flowmeter, the price of gas turbine flowmeter is still relatively high. The reason why users choose gas turbine flowmeter is mainly because of its high accuracy, but the higher the accuracy of the flowmeter, the more sensitive to changes in field conditions. For the large diameter pipeline trade settlement instrument, more investment in the instrument is cost-effective, and for the conveyance of small amounts of occasions to choose a medium level of accuracy can be.
  • 2、Flow range: Each calibre of flowmeter has a specific measuring range, and the choice of flowmeter calibre is also determined by the flow range. For example, the flow range of our DN80 gas turbine flowmeter is 15-300 cubic metres per hour. The principle of selecting the flow range is: the use of zui small flow rate shall not be lower than the instrument allows the measurement of zui small flow rate, the use of the maximum flow rate shall not be higher than the instrument allows the measurement of the maximum flow rate. For daily instrumentation of the actual operating time does not exceed 8 hours of intermittent work occasions, select the actual use of zui big flow 1.3 times as the upper limit of the flow range; for daily instrumentation of the actual operating time is not less than 8 hours of continuous work occasions, select the actual use of zui big flow 1.4 times as the upper limit of the flow range. Instrument lower limit flow rate to the actual use of the minimum flow rate of 0.8 times as appropriate. In short, in order to make the use of better performance of the flow meter, the flow meter should be used in the flow range (20% ~ 80%) Qmax range is more appropriate.
  • 3、Pressure loss: try to choose a small pressure loss of the turbine flowmeter. Because the fluid through the turbine flowmeter pressure loss is smaller, the fluid from the input to the output pipeline consumes less energy, that is, the total power required will be reduced, which can greatly save energy, reduce transport costs, improve the utilisation rate. Someone once did a test, the main components of the pressure loss is the turbine flowmeter leading flow, the choice of semi-ellipsoidal leading flow with the choice of conical leading flow compared to the former turbine flowmeter pressure loss can be greatly reduced.
Structure type:
  • (1)、By the internal structure of the turbine flowmeter we recommend the use of counter-thrust turbine flowmeter. Because the counterpropulsion structure in a certain flow range can make the impeller of the flowmeter is in a floating state, axial contact does not exist, no end face friction and wear, which can prolong the service life of the bearings.
  • (2)、According to the pipeline connection type selection, flowmeter has horizontal and vertical installation of two ways, horizontal installation and pipeline connection with flange connection, threaded connection and clamp connection. Medium calibre flange connection, small calibre and high pressure pipeline threaded connection, clamp connection is only applicable to low-pressure small and medium pipe diameter, vertical installation of general threaded and clamp connection.
  • (3)、Consider the influence of temperature, humidity and other environmental recommendations. Note that when measuring flammable and explosive media such as natural gas, choose an intrinsically safe explosion-proof turbine flowmeter.
  • 5、Bearing material: the bearing of the turbine flowmeter generally has three types of materials: tungsten carbide, PTFE and carbon graphite. Natural gas metering instrument bearings should be selected tungsten carbide material.
  • 6、The density of the measured gas on the gas turbine flowmeter, the fluid physical properties of the impact is mainly the gas density, which has a greater impact on the instrument coefficient, and mainly in the low-flow region. If the gas density changes frequently, the flow meter flow coefficient to take corrective measures. Of course, the choice of temperature and pressure compensation of the turbine flowmeter, you can simultaneously detect the temperature, pressure and flow of the measured gas, the flow can be automatically tracked to compensate for the display of the standard state (Pb = 101.325KPa, Tb = 293.15K) of the cumulative volume of the gas and real-time query of the temperature and pressure of the medium value.

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