Calculating 32mm Pipe Filling Rate

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Discussion Overview

The discussion centers on calculating the filling rate of a vertically arranged 32mm diameter pipe, 15 meters in length, under a pressure of 0.2 bar from the main supply. The context involves the filling of a 200-gallon storage tank located on the second floor, with considerations of water pressure and the necessity of a booster system.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant inquires about the filling rate of a 32mm pipe under 0.2 bar pressure and its implications for filling a storage tank.
  • Another participant questions the accuracy of the pressure reading, noting that 0.2 bar can only raise water about 2 meters.
  • A participant confirms the pressure reading and explains the client's preference for a direct connection to the main supply despite the low pressure, seeking to calculate the filling rate to demonstrate the system's inadequacy without a booster.
  • One participant asserts that water will not rise above 2 meters under 0.2 bar pressure, emphasizing the concept of hydraulic head.
  • A later reply states that at least 1.47 bar is necessary to fill the tank to the top, acknowledging the need for higher pressure.
  • Another participant suggests that a minimum of 1.5 bar is needed for a certain flow rate, recommending designing for at least 2 bar to ensure reliability.

Areas of Agreement / Disagreement

Participants express disagreement regarding the feasibility of filling the storage tank under the given pressure conditions. There is no consensus on the adequacy of the 0.2 bar pressure for the intended application.

Contextual Notes

Participants discuss the implications of hydraulic head and pressure requirements, but there are unresolved assumptions regarding flow rates, pipe characteristics, and the impact of system design on performance.

johady
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Hi,

How to calculate the filling rate of 32mm dia pipe(15m length) arrange vertically from ground to second floor with 0.2bar pressure from main supply? the storage tank capacity is 200gal at the roof of second floor. Tq
 
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0.2 bar will only raise about 2 metres, are you sure you have that pressure right?
 
Yup..we get the data based on the reading at site. Initially we want to add booster system to supply the water. But client doesn't want it. They prefer the storage tank to be connected directly to the main below. They aware about the low water pressure. I know 0.2bar will only raise about 2 metres. But eventually the water will accumulate slowly and finally will filling the storage tank on top. I just want to know how to calculate the filling rate based on the low pressure so that i can show to the client that the system will not work without the booster.
 
johady said:
I know 0.2bar will only raise about 2 metres. But eventually the water will accumulate slowly and finally will filling the storage tank on top.

Nope, it will never happen; it will only stay at the 2 m height without ever going higher. The pressure at the bottom of a 15 m pipe filled with water is 1.47 bar. That is the entire concept behind hydraulic head.
 
I see..so at lease 1.47 bar at the main supply will be needed to fill the water to the top storage tank. Thanks a lot Jack..
 
In that size pipe you need at least 1.5 bar to get 5 gpm, with valves and bends, I'd say you want at least 1.75 bar. I would design this system for 2 to be safe. But you could get away with a little less if it's more economically practical.
 

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