Tank Emptying Fixed Flow
Use this tank emptying fixed flow tool when you have measured values for tank l, outflow lpm. It applies a transparent mathematical relationship to those values to return an answer in hours. Unlike a prediction or recommendation, this is a calculation from your inputs. Flow may change with pressure or water height. Enter a different scenario to see how this particular quantity changes; check the assumptions before using it in a project.
How to use this calculator
- Use exact measurements and consistent units for tank l, outflow lpm.
- Enter each quantity; blank, nonnumeric and out-of-range inputs are not accepted.
- Compare the reported hours quantity against your own data and the limitations below.
Formula for Tank Emptying Fixed Flow
hours = tank_l/(60*outflow_lpm). Inputs are expressed in the units shown by the labels.
- This uses a direct fluid relationship and does not retrieve remote data, forecasts or individual account information.
- Flow may change with pressure or water height.
Worked examples
Worked example — Tank Emptying Fixed Flow
Enter Tank l = 3200, Outflow lpm = 15.
Apply tank_l/(60*outflow_lpm).
Calculated value: approximately 3.555556 hours.
Understanding the result
The example produces about 3.555556 hours; this is a mathematical output for the example inputs, not an observed result for your project.
Flow may change with pressure or water height.
Important notes
Flow may change with pressure or water height.
Use values from the same measurement period or physical system. The result is in hours and is not a guarantee of capacity, safety, ranking or revenue.
Frequently asked questions
What does Tank Emptying Fixed Flow calculate?
It converts tank l, outflow lpm into a quantity measured in hours using the stated formula.
Which assumption matters most?
Flow may change with pressure or water height.
How can I check this output?
Recalculate the worked example from the input quantities, confirm units and compare with direct measurements where available. This calculator does not fetch live data.
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Related explanations
Learn the method behind the number or compare the terminology before using the calculator.
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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.