What are the measurement ranges of vortex flowmeters?

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1. National Standard Specification for Vortex Flow Meter

The national standard specification for vortex flow meter mainly includes the following items

1. GB/T 25922-2023 standard name: "Measurement of fluid flow in closed pipelines using vortex flow meters installed in circular cross-section pipelines filled with fluid." Issued by: State Administration for Market Regulation, National Slag and Rock Standardization Management Committee. Centralized unit: China Machinery Industry Federation. Implementation date: March 1, 2024. Remarks: This standard is equivalent to the international standard ISO 12764:2017 and is applicable to the measurement of fluid flow in closed pipelines.

2. JB/T 9249-2015 standard name: Machinery Industry. Recommended standard supervisory department: Ministry of Industry and Information Technology/National Energy Administration Implementation date: March 1, 2016 Remarks: This standard completely replaces JB/T 9249-1999, Belonging to industry recommended standards

3. JJF (Anhui) 179-2024 standard name: "Online Calibration Specification for Gas Vortex Flow Meter" Scope of application: Applicable to gas vortex flow meters with a diameter greater than DN50mm, used for measuring specific conditions of steam or other gas media, and able to directly display standard flow rate or mass flow rate. Remarks: Not applicable to vortex flow meters without temperature and pressure compensation. Other relevant standards include the International Electrotechnical Commissions IEC 60534 series, Chinas mandatory national standard GB/T 32201-201

5, and the National Metrological Verification Regulation JJG 198.

2. What are the representation methods of various types of flow meters in PID process diagrams?

The common representation methods of flow meters in P&ID (Process Piping and Instrument Diagram) mainly use exclusive graphic symbols to match the instrument tag area. The specific explanations of the four types of mainstream flow meters are as follows:

2. Turbine flowmeter symbol: represented by a circular symbol with blades, with corresponding instrument tag numbers marked on the side. Working logic: The fluid impacts the turbine blades to rotate, and the turbine speed is proportional to the fluid flow rate. Flow data can be obtained by detecting the speed. Electromagnetic flowmeter symbol: represented by a rectangular or circular symbol with electrodes, with corresponding instrument tag numbers marked on the side. Working logic: Based on the principle of electromagnetic induction, when a conductive liquid flows through a magnetic field, an induced electromotive force is generated. The flow rate can be determined by measuring the electromotive force.

4. Vortex flowmeter symbol: represented by a symbol with the vortex Tucson basis, with the corresponding instrument tag number marked on the side. Working logic: When a fluid flows through a vortex generator, periodic vortices are generated, and the vortex frequency is related to the fluid flow rate. By detec

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