Calculation of air pressure water supply pipe diameter
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The water supply is provided by air pressure; it takes 3 seconds for water to travel from the water tank to the nozzle. Assuming a distance of 20 meters along the pipeline, how should the pipe diameter be calculated? What are the limitations on the flow velocity?
What is the relative position of the nozzle and the water tank – at the same height, spraying upwards all the time, or downwards all the time?
The water tank is below the sprinklers, one floor above； I just checked, and it says that the diameter of the spray pipe should be determined based on the number of nozzles and the level of hazard. Is there a specific calculation method for this?
I won’t, I just feel that the conditions aren’t right; I’m just asking. @Chow Tai Fook
I haven’t calculated it in a long time, but for this case, certain conditions are missing; to calculate the diameter, at least the volume of water flow needs to be known. Furthermore, it is delivered in 3 seconds over a distance of 20m, with a flow rate of 7 m/s; generally, the maximum flow rate for water is 4 m/s, and high-pressure water supply is required. This condition doesn’t seem very reasonable.
In water supply and drainage, how is flow velocity calculated using pressure difference?