How to determine the flow rate of fire hydrant pump
Determining the flow rate of a fire hydrant pump is a process that comprehensively considers multiple factors. The following is a detailed explanation of the method for determining the flow rate of a fire hydrant pump:
1. The main factors affecting the flow rate of a fire hydrant pump
Number of fire hydrants: According to relevant regulations, the number of outdoor fire hydrants should not be less than the indoor area divided by 200, and the number of indoor fire hydrants should be comprehensively considered based on factors such as the height, number of floors, and use nature of the building.
Fire extinguishing requirements: Determine the flow rate, pressure and other parameters of the fire hydrant pump based on the use nature and structural characteristics of the building.
Pipeline characteristics: Including pipeline diameter, length, material and friction coefficient, etc.
2. Steps for determining the flow rate of a fire hydrant pump
Determine the number of fire hydrants: Determine the number of fire hydrants required based on the specific situation of the building.
Determine fire extinguishing requirements: Determine the flow rate and pressure requirements required for fire extinguishing based on the use nature and structural characteristics of the building.
Calculate the fire water flow rate: Calculate the fire water flow rate based on the number of fire hydrants and fire extinguishing requirements. This is usually expressed as the amount of water that can be output per unit time (such as 1 hour).
Determine the flow rate of a fire hydrant pump: On the basis of determining the fire water flow rate, further consider the output flow rate of the fire hydrant pump. The output flow of the fire hydrant pump should be greater than or equal to the fire water flow to ensure the effective supply of fire water during the fire extinguishing process.
3. Actual calculation example
Take a fire scene as an example, assuming that a type A fire hydrant is needed, the maximum head of the water pump above the fire hydrant reaches 40 meters, the drainage pipe level is 6, the fire hydrant pipe length is 70 meters, the pipe material is steel pipe, and the diameter is 100mm. Based on these parameters, the water pump flow can be calculated according to the following steps:
Determine the cross-sectional area of the fire hydrant outlet: According to the drawings or actual measurements, the cross-sectional area of the outlet of the type A fire hydrant is obtained.
Determine the pipe cross-sectional area: Calculate the pipe cross-sectional area according to the pipe diameter.
Calculate the flow rate: Determine the water flow rate according to the pipe material and friction coefficient.
Calculate the flow rate: Calculate the flow rate of the fire hydrant pump according to the formula (flow rate = drainage pipe level × fire hydrant outlet cross-sectional area × flow rate).
