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1. Installation method of fire flowmeter
The fire flowmeter must be installed on a straight pipeline, with at least 5 times the diameter of the straight pipeline on both sides. When screwing the flow switch into the pipeline tee, to prevent damage to the switch, it is not allowed to hold the body for installation. It must be installed at the hexagonal corner of the body with a hexagonal vibrator. When the fire flowmeter is tightened, the flow direction plate should be perpendicular to the flow direction of the fluid, and the arrow direction on the flow switch housing should be consistent with the flow direction of the fluid in the pipeline. The fire flowmeter should be able to test 175% of the selected flow rate of the water pump. Fire flow meters can be installed in vertical pipes with upward liquid flow direction in horizontal pipes, but cannot be installed in pipes with downward liquid flow direction. Fire flow meters must not be subjected to water hammer. If a quick closing valve is installed below the water flow switch, a closing throttle must be used to prevent water flow impact. Additional information: When connecting, attention should be paid to the following aspects:
(1) Be sure to seal and prevent water leakage;
(2) Remember to keep the "→" direction marked on the instrument consistent with the actual water flow direction;
(3) After installation, to avoid affecting the accuracy of the instrument, be sure not to let the sealing gasket protrude into the pipeline;
(4) After all instruments have been installed and the liquid hopper is vertical, when the pipeline valve is reopened, do not allow negative pressure to form in the pipeline where the instrument is installed to preven
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(5) Installation requirements should be based on the absence of bubbles at the instrument, otherwise it may cause inaccurate flow rate measurement. Reference information: Baidu Baike - Flow Meter
2. Can fire flow meters be installed vertically? All environments on site meet the requirements and can be installed vertically. Taking the use of electromagnetic flow meters in on-site firefighting as an example: Selection of installation location for electromagnetic flow meters
(1) When there are bends, valves, and pumps upstream and downstream of the installation location of electromagnetic flow meters, the fluid forms a transverse secondary flow in the pipeline, and the velocity distribution deviates. When the length of the straight pipe section is insufficient, the measurement accuracy decreases. In general, the length of the upstream straight pipe section is not less than 10D, and the length of the downstream straight pipe section is not less than 5D. However, when there are pumps and other equipment upstream, the length of the straight pipe section must not be less than 30D. Do not install instruments on the inlet side of the pump, as this will cause pipeline vacuum and measurement errors. Where D is the inner diameter of the pipeline. Changyou
(2) During measurement, it is necessary to ensure that the pipeline is filled with liquid, otherwise it will affect the measurement accuracy. When installing at an angle or vertically, the measured liquid should flow rapidly from bottom to top. The measured liquid should not contain too many bubbles.
(3) Strong vibration of the pipeline should be avoided as much as possible. If it cannot be avoided, the sensor and transmi
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