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1. What are the standard symbols for flow meters in PID diagrams?
In P&ID (Piping and Instrument Diagram), different types of flow meters have their own unique standard symbols, and common ones are as follows:
Sakura liquid, labeled with instrument tag number on the side, measures the flow rate of conductive liquid based on Faraday electromagnetic induction principle
4 Vortex flowmeter: The standard symbol is a circle with a vortex pattern, and the instrument tag number is marked on the side. The flow rate is calculated by detecting the vortex frequency generated by the fluid flowing through the blocking fluid.
2. What are the manufacturing standards for vortex flowmeters?
The manufacturing standards for vortex flowmeters mainly consist of three national beam seepage standards and industry standards, the latest of which is GB/T 25922 released in 2023.
. 1. National standard (GB/T) GB/T 25922-2023 "Measurement of fluid flow in closed pipelines using vortex flowmeters installed in circular cross-section pipelines filled with fluid". This is the latest and most core national standard, which will be implemented from March 1, 2024, comprehensively stipulating its terminology definition, measurement characteristics, installation conditions, pressure testing, and signal converter requirements. 2. Mechanical Industry Standard (JB/T) JB/T 9249-2015 "Vortex Flow Meter". This is a widely followed recommended standard in the industry, covering the technical requirements, testing methods, inspection rules, as well as the manufacturing process details such as labeling, packaging, and storage of products. 3. National Metrology Verification Regulations (JJG) JJG 1029-2007 "Vortex Flow Meter Verif
3. Detailed explanation of the usage steps for vortex flowmeters.
The standard usage process for Kaifeng Hexin vortex flowmeters (taking the mainstream LUGB series as an example) is divided into four core steps: installation and calibration, on-site use, daily operation and maintenance, and troubleshooting. It is necessary to strictly follow the accompanying factory instructions and JB/T 9248-2015 "Vortex Flowmeters" industry standard.
.1. Verification and preparation before installation (1) Appearance and accessory inspection 1 Check the nameplate parameters of the flowmeter body: confirm that the nominal diameter, nominal pressure, medium temperature range, output signal type match the on-site working conditions. The nameplate of Kaifeng Hexin will indicate the factory number and calibration date, and the calibration certificate needs to be retained. 2. Check that the sensor body is not bumped, the wiring terminals are not loose, the matching PTFE/metal sealing gasket is not deformed or damaged, and the signal cable meets the on-site explosion-proof/protection level requirements. The conventional model protection l
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