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Detention Time Calculator.

Calculate hydraulic detention (residence) time as volume divided by flow.

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02 / RÉPONSE

Volume

Volumetric flow

Detention time

10.000000time

Educational chemistry arithmetic only. Keep units consistent and verify assumptions against your laboratory or course specification.

Use Cases

Design a sedimentation tank

Ensure adequate residence time for particles to settle by calculating detention time for a given tank volume and flow rate.

Example: A 50 m³ tank with a flow of 10 m³/h gives a detention time of 5 hours.

Check reactor performance

Verify that a chemical or biological reactor provides sufficient contact time for reactions to occur.

Example: If a reactor needs 2 hours, adjust volume or flow accordingly.

Frequently Asked Questions

What is detention time?: Detention time, also called residence time, is the average time a fluid particle spends in a tank or reactor. It is calculated by dividing the tank volume by the volumetric flow rate.
How do I use this calculator?: Enter the tank volume in cubic meters (m³) and the volumetric flow rate in cubic meters per hour (m³/h). The calculator divides volume by flow to give the detention time in hours.
What units are used?: Volume is in cubic meters (m³) and flow is in cubic meters per hour (m³/h). The result is in hours.

Tips & Common Mistakes

Tips

Ensure volume and flow are in the same units (m³ and m³/h) before calculating.
For continuous flow systems, detention time is an average; actual residence times vary.
Use detention time to compare different tank sizes or flow rates for process design.
Remember that detention time is a theoretical value; real systems may have short-circuiting or dead zones.

Common Mistakes to Avoid

Mixing units, such as using liters for volume and m³/h for flow, without conversion.
Forgetting that detention time is volume divided by flow, not the inverse.
Assuming detention time equals the time for complete mixing or reaction; it's only the average residence time.

Last updated: August 13, 2026

Use Cases

Design a sedimentation tank

Ensure adequate residence time for particles to settle by calculating detention time for a given tank volume and flow rate.

Example: A 50 m³ tank with a flow of 10 m³/h gives a detention time of 5 hours.

Check reactor performance

Verify that a chemical or biological reactor provides sufficient contact time for reactions to occur.

Example: If a reactor needs 2 hours, adjust volume or flow accordingly.

Frequently Asked Questions

What is detention time?

Detention time, also called residence time, is the average time a fluid particle spends in a tank or reactor. It is calculated by dividing the tank volume by the volumetric flow rate.

How do I use this calculator?

Enter the tank volume in cubic meters (m³) and the volumetric flow rate in cubic meters per hour (m³/h). The calculator divides volume by flow to give the detention time in hours.

What units are used?

Volume is in cubic meters (m³) and flow is in cubic meters per hour (m³/h). The result is in hours.

Tips & Common Mistakes

Tips

Ensure volume and flow are in the same units (m³ and m³/h) before calculating.
For continuous flow systems, detention time is an average; actual residence times vary.
Use detention time to compare different tank sizes or flow rates for process design.
Remember that detention time is a theoretical value; real systems may have short-circuiting or dead zones.

Common Mistakes to Avoid

Mixing units, such as using liters for volume and m³/h for flow, without conversion.
Forgetting that detention time is volume divided by flow, not the inverse.
Assuming detention time equals the time for complete mixing or reaction; it's only the average residence time.

Use Cases

Design a sedimentation tank

Ensure adequate residence time for particles to settle by calculating detention time for a given tank volume and flow rate.

Example: A 50 m³ tank with a flow of 10 m³/h gives a detention time of 5 hours.

Check reactor performance

Verify that a chemical or biological reactor provides sufficient contact time for reactions to occur.

Example: If a reactor needs 2 hours, adjust volume or flow accordingly.

Frequently Asked Questions

What is detention time?

Detention time, also called residence time, is the average time a fluid particle spends in a tank or reactor. It is calculated by dividing the tank volume by the volumetric flow rate.

How do I use this calculator?

Enter the tank volume in cubic meters (m³) and the volumetric flow rate in cubic meters per hour (m³/h). The calculator divides volume by flow to give the detention time in hours.

What units are used?

Volume is in cubic meters (m³) and flow is in cubic meters per hour (m³/h). The result is in hours.

Tips & Common Mistakes

Tips

Ensure volume and flow are in the same units (m³ and m³/h) before calculating.
For continuous flow systems, detention time is an average; actual residence times vary.
Use detention time to compare different tank sizes or flow rates for process design.
Remember that detention time is a theoretical value; real systems may have short-circuiting or dead zones.

Common Mistakes to Avoid

Mixing units, such as using liters for volume and m³/h for flow, without conversion.
Forgetting that detention time is volume divided by flow, not the inverse.
Assuming detention time equals the time for complete mixing or reaction; it's only the average residence time.