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1. Discharge outlet flow monitoring
2. What are the requirements for flow velocity and straight pipe section of sewage flowmeter?
The requirements for flow velocity and straight pipe section of sewage flowmeter are as follows:
1. Requirements for medium flow velocity Economic flow velocity range Pipeline flow velocity is usually selected Economic flow velocity 1.5~3m/s, and the sensor diameter should be consistent with the pipe diameter.
. When the flow rate is at full capacity, the liquid flow velocity can be selected within the range of 1-10m/s, but it is recommended that the upper limit flow velocity not exceed 5m/s (theoretically unlimited, but actually needs to be controlled). Adjustment of flow velocity for special fluids: For fluids that are prone to adhesion, accumulation, and scaling, the flow velocity should be ≥ 2m/s. It is recommended to use a flow velocity of 3-4m/s or higher to achieve self-cleaning and avoid medium adhesion. Abrasive fluids such as slurry: The commonly used flow rate should be ≤ 2-3m/s to reduce wear on the lining and electrodes and extend equipment life. The fluid direction must be consistent with the flow meter mark, and the installation pipeline must always be filled with the measured medium (full pipe state) to prevent measurement errors caused by empty pipes.2. Requirements for straight pipe sections: The length of the upstream straight pipe should be ≥ 10 times the diameter of the pipeline (10D).
. Downstream straight pipe section: It needs to be ≥ 5 times the inner diameter of the pipeline (5D). If there is a non fully open gate valve or regulating valve in the upstream under special working conditions, the upstream straight pipe section needs
III. Key precautions Full tube status: All flow meters must be filled with medium, and not filling the tube will cause significant errors. If necessary, the pipeline needs to be modified.
. Flow range matching: It is necessary to confirm that the medium flow meets the minimum, common, and maximum flow requirements of the sewage flowmeter. Maintenance and selection: Adjust the flow rate according to different fluid characteristics (such as adhesion and abrasion), and select suitable lining and electrode materials. By meeting the above requirements for flow rate and straight pipe section, the measurement accuracy of the sewage flowmeter can be ensured, and the service life of the equipment can be extended.3. Measurement method of sewage flowmeter
1. Measurement principle of plug-in Doppler ultrasonic flowmeter When the sewage contains a lot of sediment or bubbles and flows in a full pipe state, this principle is suitable for use.
. Because if an electromagnetic flowmeter is used, it will operate well in the first few years, but the reading will gradually decrease after a few years. This is mainly because the sewage is relatively dirty and contains a large amount of
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