Spray flowmeter | Will the flowmeter still record the flow rate normally when the nozzle is blocked

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1. Where should the flow meter in the fire sprinkler system be installed in the system?

Install the flow meter at the inlet section of the alarm valve, as the specification requires it to be installed on the main pipe.

2. Manufacturer of radar open channel flow meter.

3. How to convert the fire pressure switch and flow meter?

? Hello, regarding the issue you raised, the setting and conversion of pressure switches and flow meters in the fire protection system mainly serve the start-up control of automatic fire protection facilities to ensure that the fire protection system can start in a timely and accurate manner and provide sufficient water supply in case of a fire. The following is an explanation based on the information you provided: Flow switch setting: Fire hydrant system: According to the new fire protection regulations in October 2014, the starting flow rate of the flow switch in the fire hydrant system is set to the flow rate of a water gun, which is 5L/s when it collapses. This means that when the system detects a water flow rate of 5L/s, the flow switch should send a signal to activate the fire pump or other responsive equipment. Spray system: The starting flow rate of the spray head is 1.33L/s. Therefore, the flow switch of the sprinkler system is usually set to activate when it detects a flow rate equal to or greater than the opening of one nozzle (i.e. 1.33L/s). Pressure switch setting: Pressure switch inside the fire hydrant room: The starting pressure is 1.14 MPa (please note that the 1.14 start here may refer to 1.14 times the reference pressure or directly 1.14 MPa, the specific value needs to be confirmed according to the actual situation). This means that when the pressure Spray flowmeter

inside the pipeline drops to this set value, the pressure switch will activate the fire pump to maintain the necessary pressure supply for the use of the fire hydrant. Fire hydrant outdoor pressure switch: The starting pressure is 0.2 MPa. This lower pressure setting may be to ensure that the fire pump can be quickly started even when the initial fire pipeline pressure drops, ensuring that the outdoor fire hydrant has sufficient water pressure for firefighting operations. Conversion of pressure and flow rate: In practical applications, there is no direct mathematical conversion relationship between pressure and flow rate, as they are influenced by various factors such as pipeline size, material, fluid characteristics (such as viscosity), pipeline layout, etc. However, hydraulic formulas such as Bernoullis equation or Darcy Weisbachs equation can be used to estimate the possible flow range at a given pressure under specific pipeline conditions. These calculations typically require data such as the diameter, length, fluid density, viscosity, and friction coefficient of the pipeline. Flow meter conversion parameters: The setting of flow meters is usually based on actual needs, such as 5L/s or 1.33L/s mentioned above, rather than directly converting through pressure. The calibration and setting of flow meters are based on directly measuring the volume of liquid flowing through, rather than indirectly inferring from pressure. In summary, the setting of pressure switches and flow meters is determined based on fire safety regulations and system design to ensure the effectiveness and safety of the fire protection system. The relationship between pressure and flow rate is complex and requires specific engineering calculations, b

Spray flowmeter | Will the flowmeter still record the flow rate normally when the nozzle is blocked

1. Where should the flow meter in the fire sprinkler system be installed in the system?

2. Manufacturer of radar open channel flow meter.

3. How to convert the fire pressure switch and flow meter?

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