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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. How to adjust inaccurate gas flow meter values
The adjustmen
1. Differential pressure flowmeter • Zero calibration: Close the upstream and downstream valves, ensure that the medium flow completely stops, and perform zero calibration through the transmitter menu (note: operate in a state of no flow and stable pressure/temperature).
. • Range adjustment: Based on actual operating parameters (design pressure, temperature, density), recalculate the theoretical differential pressure value and correct it through the transmitter range setting interface2. Vortex flowmeter • K coefficient correction: Compare the measured flow value with the displayed value on a standard device (such as a sonic nozzle calibration system), and adjust the instrument coefficient using the formula \ (K0 {\ text {new}}=K0 {\ text {original}} \ times (Q_ {\ text {standard}/Q_ {\ text {display}}) \). • Vibration interference elimination: Check the vibration situation of the pipeline, install shock absorbers or adjust the filtering frequency parameters (usually set to 1.5-2 times the actual signal frequency)
3. Thermal mass flowmeter • Gas composition setting: Confirm whether the actual gas composition is consistent with the preset parameters, especially for mixed gases, accurate percentages of each component need to be input. • Temperature compensation: check whether the PT100 temperature sensor works normally, and correct it if necessary through the temperature compensation coefficient (usually 0.1-0.3%/℃). Installation angle correction: Check the installation angle deviation of the
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