Advantages and disadvantages of gas turbine flowmeter and not applicable occasions

Project Overview

But as a flowmeter in the material balance and energy measurement needs to detect the mass flow, then the output signal of the flowmeter should be monitored at the same time the volume flow and fluid density, fluid properties and components of the flow measurement or have a direct impact. Today's instrumentation editor for you to talk about the advantages and disadvantages of gas turbine flowmeter and does not apply to the occasion.

一、Gas Turbine Flow Meter Main Advantages

• 1.Smaller pressure loss: generally 0.1 to 2.5kPa at atmospheric pressure.
• 2.High accuracy: 1-2.0 per cent for full scale, and 0.5-1.0 per cent for high accuracy type; it is a kind of high accuracy.
• 3.Compact structure, lightweight, relatively easy to install and use, large circulation capacity.
• 4.Good repeatability: generally up to 0.05% ~ 0.2%, due to its good repeatability, through frequent calibration or online calibration can reach the accuracy of *, so in the trade settlement is one of the preferred choice of flowmeter.
• 5.Wide range: Medium and large diameters are generally up to 20:1 or more, while small diameters are 10:1, and the starting flow rate is also lower.
• 6.Using a variety of display modes, can only with mechanical counter or only with ordinary type flow totaliser, can also be added to the mechanical counter temperature and pressure compensation instrument, or only with temperature and pressure compensation instrument, and can be long-term lithium battery power supply, easy to use.
• 7.Because of the general use of pulse frequency signal output, suitable for total measurement and connection with computer, no zero drift, strong anti-interference. At the same time, if the high-frequency signal output is used, a very high frequency signal (3-4kHz) can be obtained, and the signal resolution is strong.

二、Main disadvantages of gas turbine flowmeter

• 1.Regular refuelling to ensure adequate lubrication of the bearings to ensure metrological accuracy and prolong service life.
• 2.Periodic calibration is required to maintain calibration characteristics over time. Suspended or corrosive components contained in the medium can cause bearing wear and seizing problems, which can change its accuracy and limit its range of application, although the situation has improved with the use of wear-resistant carbide shafts and bearings, this problem still exists. Therefore, they must be calibrated regularly and equipped with on-site calibration equipment for trade storage and transport and high-precision measurement requirements.
• 3.The physical characteristics of the medium (such as density, viscosity, etc.) have a greater impact on the characteristics of the turbine flowmeter. Gas flowmeter is susceptible to density, and temperature and pressure are closely related, so the temperature and pressure correction.

三、Gas turbine flowmeter not applicable occasions

• 1.Higher cleanliness requirements for the measured medium require the installation of filters as required, but this also brings about an increase in pressure loss.
• 2.Gas turbine flowmeter is affected by the flow field distribution, so the inlet of the flowmeter without rectifier should be required to set the upstream and downstream side of the sensor straight section, the inlet design of the flowmeter with a rectifier should also be set in accordance with the requirements of the instructions for the use of the length of the straight section.
• 3.It is not suitable for use in the presence of strong pulsating flows, nor is it suitable for the measurement of mixed-phase flows.
• 4.It is not permitted to be used where a quick switch is present.
• 5.The flow characteristics of small diameter turbine flowmeter is seriously affected by physical properties, so it is difficult to improve the performance of small diameter turbine flowmeter. Such as the smallest diameter DN25, but its range is only 10:1, accuracy of ± 1.0%.