Vortex flowmeter medium | How to solve the problem of excessive range displayed by vortex flowmeter | Shaoguan ultrasonic flowmeter manufacturer

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1. How to choose a vortex flowmeter under pressure conditions

The core parameters for choosing a vortex flowmeter under pressure conditions are that the pressure resistance level must be ≥ 1.5 times the working pressure, and the 316L stainless steel shell is preferred when the medium temperature is ≤ 350 ℃. 1. Selection of pressure resistance parameters - nominal pressure resistance level ≥ 1.6 times the maximum working pressure of the system (GB/T12264-2022 standard) - pressure resistance range of conventional industrial vortex street flow meters: PN10~PN420 (1~42MPa) - ultra-high pressure models need to be specially customized, up to PN630 (63MPa). 2. Structural material requirements • Shell material: carbon steel (≤ 2.5MPa), 304 stainless steel (≤ 4.0MPa), 316L stainless steel (≥ 4.0MPa or corrosive medium) • Vortex rough stroke generator: must be made of solid processed hard alloy (such as WC Co) • Sealing form: metal wound gasket (≤ 350 ℃) or graphite gasket (>350 ℃). 3 Key performance indicators | Parameters | Requirements for conventional operating conditions | Requirements for pressurized operating conditions | | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------The core reason for the small measurement value is that the vortex generating body is wrapped by impurities or mechanically damaged on the upstream surface, resulting in a drift of the K coefficient (instrument coefficient). 1. Problem diagnosis and troubleshooting 1.1 Main cause analysis • Body contamination: Impurities, oil stains, scale, etc. in the medium adhere to the surface of the vortex generator, changing i

ts geometric shape, resulting in a vortex frequency lower than normal and a calculated flow rate result that is smaller. Mechanical damage: Long term erosion and cavitation of solid particles in high flow media can cause wear and passivation of the upstream edge, which can also change the frequency of vortex shedding. • K coefficient variation: Both of the above situations directly cause a change in the K coefficient (the number of pulses corresponding to a unit volume flow rate) of the flowmeter, usually increasing, resulting in fewer pulse signals detected by the sensor at the same actual flow rate and a smaller displayed flow rate. 1.2 Quick on-site inspection steps 1 Check the cleanliness of the medium inside the pipeline and confirm if there are any newly introduced sources of pollution. 2. Check whether the straight pipe sections before and after the flowmeter meet the requirements (usually 10D before and 5D after). Eddy current or flow velocity distribution distortion will affect the measurement. 3. Check the installation of the flowmeter to ensure that the body axis is parallel to the pipeline axis and that the gasket does not protrude into the pipeline. 4. If possible, the flowmeter can be removed under safety conditions and visually inspected for cleanliness, wear, or damage on the surface of the vortex body. 2. Solution and Implementation 2.1 Online Cleaning For minor pollution, special chemical cleaning agents can be injected upstream of the flowmeter for cyclic cleaning while ensuring safety and cutting off the power supply to dissolve attachments. 2.2 Offline Maintenance If pollution is severe or there is mechanical damage. Damage, the flowmeter must be removed from the pipeline. • Cleaning: Use a soft clot

Vortex flowmeter medium | How to solve the problem of excessive range displayed by vortex flowmeter

1. How to choose a vortex flowmeter under pressure conditions

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