The significance of performance measurement of water cannons and foam cannons to Isuzu fire trucks is mainly reflected in evaluating fire extinguishing effects, ensuring safety, guiding equipment selection and purchase, improving fire extinguishing efficiency, and reducing losses. By measuring parameters such as spray distance and spray angle, appropriate equipment and spray strategies can be selected according to actual needs to ensure the safety of firefighters and other personnel, control fire intensity, cool fire sources, suppress fire spread, etc., and reduce disaster losses and environmental impacts. A. Determination of the range of water cannon and foam cannon: 1.Test conditions The test site should be flat, with sufficient length and width. The fire truck should be parked at a suitable position on the site, and the gun elevation angle should be 30°±2°. Taking the intersection of the plumb line passing the muzzle and the ground as the origin, measure the range in the downwind direction. 2. Test operation During the test, the wind speed should be less than 2m/s. Start the fire pump. After the inlet pressure of the gun reaches the rated injection pressure and the sprayed water or foam stabilizes, spray continuously for 30 seconds without changing the elevation angle. Use a stopwatch to measure the farthest point where the medium is continuously dropped for no less than 10 seconds. The distance from this point to the origin is the range of the gun. B. Measurement of fire truck outlet water pressure and flow rate: 1.Test conditions The test site should be flat, with sufficient length and width. The fire truck should be parked at a suitable position on the site, and the gun elevation angle should be 30°±2°. Taking the intersection of the plumb line passing the muzzle and the ground as the origin, measure the range in the downwind direction. 2. Test operation Start the fire truck, adjust the speed of the pump and the opening of the outlet valve so that the water pressure and flow rate of the fire truck reach the values specified. After the operation is stable, read the water pressure and flow values. C. Determination of mixing ratio: Taking advantage of the characteristics of different refractive indexes of foam mixtures of different concentrations, a refractometer is used to measure the mixing ratio. First, make a calibration curve, use a dropper to take out the foam liquid from the foam liquid tank of the fire truck, and drop 3mL, 6mL, and 9mL foam liquid into three 100mL measuring cylinders respectively; then add the water in the water tank of the semi-fire truck into each Set the measuring cylinder to 100 mL, mix thoroughly to make foam mixtures with standard concentrations of 3%, 6%, and 9%. Read the scales on the refractometer, and make the relationship between the refractometer scales and the concentration of the foam mixture on the graph paper. Calibration curve. Use the foam mixture precipitated by the liquid elution time test as a samp...
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