How to wire the fire flowmeter | Installation location of ultrasonic flowmeter in the fire pump room

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1. Method for testing the medium pressure flow rate of medium and low pressure fire pumps The core method for testing the medium pressure flow rate of medium and low pressure fire pumps is to adjust the opening of the outlet valve and the pump speed, measure no less than 8 sets of pressure flow data at rated speed, and finally draw a characteristic curve and calculate the water supply. 1. Preparation of instruments before conducting the voltage test: • Standard pressure gauge: pressure measuring device with an accuracy of not less than 1.5 levels, or other equivalent precision • Flow meter: used to measure water flow rate • Speed tester or tachometer: used to measure the speed of the fire pump. 2 Specific testing steps • Installation of instruments: Install the pressure gauge at the outlet end of the fire pump; Connect a flow meter with a straight pipe section to the portable fire hydrant. • Open parameter tuning: Slightly open the fire hydrant valve and close all other outlet valves. Start the fire pump and adjust its speed to the rated value. After stable operation, measure and record the pumps speed, outlet pressure, and flow rate values simultaneously. Multiple measurements: Gradually increase the opening degree of the fire hydrant valve, and after each adjustment, readjust the speed of the fire pump to the rated value, and then repeat the measurement of speed, pressure, and flow rate. The number of adjustments for the valve from slight opening to full opening shall not be less than 8 times, and the opening process shall be uniformly carried out. 3. Subsequent data processing: Draw curves: Plot all outlet pressure and flow data points measured at rated speed as characteristic curves. • Calculate water volume: Based on the drawn characteristic curve, calculate the total water supply of the fire pump under rated conditions, which must comply with relevant national or industry regulations.

2. Installation position of ultrasonic flowmeter in fire pump room

Ultrasonic flowmeter in fire pump room should be installed at the inlet and outlet pipelines.

1. Installation of inlet pipeline: The ultrasonic flowmeter should be installed at the outlet of the water pump. This position ensures that the flow meter measures the water flow output by the pump, accurately reflecting the working status of the pump. 2. Installation of the outlet pipeline: In the outlet pipeline, the ultrasonic flow meter should be installed at the outlet. In this way, the flow meter can measure the water flow leaving the fire pump room, which helps monitor the flow situation of the entire system. During the installation process, it is also important to pay attention to the following points to ensure measurement accuracy: 1. Avoid turbulent flow areas: flow meters should be kept away from areas that are prone to turbulence, such as valves, bends, and pumps. The unstable water flow in these areas can affect the measurement accuracy of the flow meter. Therefore, it is recommended that the length of the upstream straight pipe section be no less than 10 times the pipe diameter, and the length of the downstream straight pipe section be no less than 5 times the pipe diameter (if the pipeline is cumbersome, it needs to be appropriately extended).

2. Avoid installing high or low points: Flow meters should not be installed at high or low points of the pipelin

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