Calculating Water Flow: Time to Fill Canister

AI Thread Summary
The discussion focuses on calculating the time required to fill a container with water, considering factors like container capacity, foot valve size, and water depth. Tests indicate a flow rate of approximately 3.5 liters per second at a depth of 1 meter with specific valve and air pipe sizes. The impact of air line length and diameter on evacuation time is questioned, along with the effects of using compressed air for pumping water. The user seeks a formula that incorporates various parameters to predict filling time accurately. The relationship between air line characteristics and filling efficiency remains a key concern.
Red Dog
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I have been trying to work out a formula to calculate how long it might take to fill a container of a known capacity in various depths of fresh water. The container would have a foot valve for entry and a pipe extending above the surface for air displacement. Tests at 1metre deep have given about 3.5 litres per second for a 40mm and 50mm foot valve and an air pipe of 13mm and 20mm.
I have a formula for working out the pressure at a set depth and I am assuming that it should fill more quickly the deeper it is.
Will the length and/or the diameter of the air line affect the time it takes for the air to evacuate?
If I pump the water using compressed air, would the advantage of the extra water over the canister be negated by the extra head to pump?
I would like to input values for canister volume, foot valve size, depth and air line diameter and obtain the time it will take to fill.

Thanks
 
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If the air line had zero diameter or an infinite length, do you think this would have an effect?
 

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