Vortex flowmeter selection steps

Project Overview

As a new type of flow meter, the vortex flowmeter has developed rapidly since the mid-1980s. It has many advantages and strengths in flow measurement. The use of vortex flowmeters for flow measurement in China has also received more and more attention. At present, our country has a product series with excellent performance and independent intellectual property rights, such as the LUB vortex flowmeter of Qingdao Hesheng Measurement and Control. Vortex flowmeter selection is to choose the most suitable instrument among many varieties. The editor will give a brief introduction to instrument professionals on how to select a vortex flowmeter:

1. Determine the medium to be measured

Vortex flowmeters are suitable for gases, liquids, steam, etc. A variety of media, but the following should be noted:

(1) High viscosity media: For media with excessive kinematic viscosity, such as some high-viscosity oils (such as heavy oil), the vortex flowmeter may not be suitable .

(2) Steam type: If the measured medium is steam, it needs to be clear whether it is saturated steam or superheated steam, because the density and flow characteristics of steam will be affected by temperature and pressure.

2. Determine the flow range

(1) Reasonability of the flow range: First determine whether the flow range is reasonable, that is, whether it exceeds the measurable range of the vortex flowmeter. If it exceeds the limit, you can consider reducing or expanding the diameter. However, it should be noted that the diameter should not be too large to avoid affecting the measurement accuracy and the service life of the flow meter.

(2) Minimum flow rate and measurement value: For the measurement of small flow rates, it is necessary to analyze whether it has measurement value, because the vortex flowmeter may not work stably at small flow rates.

3. Consider working conditions

(1) Vibration interference: Vortex flowmeters are susceptible to vibration interference. Well-designed vortex flowmeters can process them through hardware and digital signals. to eliminate interference. When selecting, it is necessary to consider whether there are vibration sources at the installation location, such as pumps, compressors, etc. LUB anti-vibration vortex flowmeter is the latest generation product independently developed by Qingdao Hesheng Measurement and Control, which solves the international problems of traditional vortex flow metering range of small range and poor anti-vibration performance. The LUB series vortex flowmeter has a wider measurement range, better anti-vibration effect and more stable operation. It is the first choice instrument for internal measurement assessment and trade settlement of enterprises.

(2) Straight pipe section requirements: A longer straight pipe section is required before and after the installation point of the vortex flowmeter to ensure fluid stability. Generally, it requires 10D in front and 5D in the back (D is the pipe diameter). If there are insufficient straight pipe sections, measurement accuracy may be affected.

(3) Installation location: Avoid installing the vortex flowmeter on a very long overhead pipeline to avoid seal leakage caused by sagging of the flowmeter. If installation is unavoidable, pipe fastening devices must be installed upstream and downstream of the flow meter.

IV. Temperature and Pressure

(1) Temperature of the measured medium: The temperature range of the vortex flowmeter is generally -40℃~350℃ (depending on the model and specification) ), it is necessary to ensure that the temperature of the measured medium is within this range.

(2) Nominal pressure: The nominal pressure of the vortex flowmeter also needs to be selected according to actual needs, such as diameter ≥ DNThe nominal pressure of a 200mm flowmeter is generally 2.5MPa, and the nominal pressure of a flowmeter with a diameter ≤ DN150mm can reach 4.0MPa.

5. Output signal and power supply

(1) Output signal: The output signal of the vortex flowmeter includes voltage pulse, current signal (such as 4~20mA) and digital communication signal (Such as Modbus RS485) etc. The appropriate output signal type needs to be selected according to actual needs.

(2) Power supply: The power supply of the vortex flowmeter is generally 12~24VDC or 36V lithium battery, etc. The appropriate power supply method needs to be selected according to the site conditions.

6. Other factors

(1) Protection level: Select the appropriate IP protection level according to the installation location of the vortex flowmeter to ensure its stable operation in harsh environments.

(2) Explosion-proof requirements: When used in flammable and explosive situations, explosion-proof vortex flowmeters need to be selected to meet safety requirements.

Vortex flow meter selection requires comprehensive consideration. Qingdao Hesheng Measurement and Control can provide a complete set of comprehensive energy management system solutions from instruments to systems. It is one of the few in the industry that has the ability to develop and manufacture intelligent metering software and produce measuring instruments. Enterprises with manufacturing capabilities. For more instrument questions, please consult Qingdao Hesheng Measurement and Control~