In the selection of a suitable gas turbine flow timing, the technical parameters and performance comparisons that need to be considered mainly include the following aspects:
Technical parameter
Flow range:
- According to the flow range of the gas to be measured, select the turbine flowmeter model whose measurement range covers the actual flow change.
- Ensure that the minimum flow rate in use is not lower than the minimum flow rate allowed by the instrument, and the maximum flow rate does not exceed the maximum flow rate allowed by the instrument.
- For discontinuous working occasions where the actual running time of the instrument does not exceed 8 hours per day, 1.3 times the maximum flow rate in actual use is selected as the upper limit of the flow range; For continuous work situations where the actual running time of the meter 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 minimum flow rate.
Accuracy level:
- Determine the accuracy level according to the measurement requirements, such as ±1%R, ±1.5%R, ±0.5%R, etc.
- High-precision flowmeters are suitable for occasions such as trade settlement that require accurate measurement, while medium-precision flowmeters are suitable for occasions where the throughput is not large.
- It should be noted that the higher the accuracy of the flowmeter, the more sensitive it is to changes in field conditions of use, so the selection needs to be considered from an economic point of view.
Pressure loss:
Try to choose a turbine flowmeter with small pressure loss to reduce the energy consumption of the fluid through the flow meter.
Output signal:
Select the appropriate output signal type according to the system requirements, such as analog signal, digital signal, frequency pulse signal, etc., to ensure compatibility with the receiving equipment of the system.
Material and structure:
According to the temperature, pressure, viscosity, density and other properties of the gas to be measured, choose the appropriate flow meter material and structure.
Corrosion-resistant materials should be selected for corrosive gases, and structures suitable for high viscosity measurements should be selected for high viscosity gases.
The reverse thrust turbine flowmeter is preferred, and its structure can make the impeller in a floating state within a certain flow range, reduce the end friction and wear, and extend the service life of the bearing.
Pipeline connection mode:
Select the appropriate flowmeter type according to the pipe connection, such as flange connection, thread connection or clamp connection.
Performance comparison
Repeatability:
An excellent turbine flowmeter should have high repeatability, with short-term repeatability up to 0.05%~0.2%.
Stability:
Gas turbine flowmeters should be able to maintain stable measurement performance over a long period of time.
Anti-interference ability:
Choose a flow meter with strong anti-interference capability to ensure measurement accuracy in complex environments.
Maintenance cost:
Choose models with low maintenance costs and long maintenance cycles to reduce long-term use costs.
Calibration requirements:
For occasions where regular calibration is required, choose a flowmeter model that is easy to calibrate to reduce calibration difficulty and cost.
Technical support and after-sales service:
Choose professional suppliers to get better technical support and after-sales service.
To sum up, technical parameters such as flow range, accuracy level, pressure loss, output signal, material and structure, pipe connection mode, as well as performance indicators such as repeatability, stability, anti-interference ability, maintenance cost and calibration requirements should be comprehensively considered when selecting a suitable gas turbine flow meter. At the same time, it is also necessary to pay attention to the importance of brand reputation and technical support and after-sales service. Through comprehensive comparison and evaluation, the most suitable gas turbine flowmeter can be selected.