Foam Concentrate Calculator

Calculation mode

Use devices when several discharge points operate together.

Flow unit

All flows are converted internally to L/min.

Foam type preset

Typical hydrocarbon fuel foam.

Concentration (%)

Typical values are 1%, 3%, or 6%.

Application time (min)

Often based on hazard and design standard.

Safety factor (%)

Common range: 5–20% for uncertainty and losses.

Reserve volume (L)

Add a fixed reserve for refill delays or testing.

Device flow list

Enable devices that operate simultaneously.

Up to 6 devices

On	Device name	Flow (lpm)

Reset

Tip: Concentrate volume is calculated in liters. If you need gallons, export CSV and convert.

Example data table

This sample demonstrates how device flows add up to a total.

Example device	Flow (L/min)	Enabled
Monitor	500	Yes
Sprinkler zone	300	Yes
Handline	100	No

For the enabled rows, total flow = 500 + 300 = 800 L/min.

Formula used

Total solution flow (L/min) = sum of enabled device flows (converted to L/min).
Solution volume (L) = Total solution flow × Application time (min).
Base concentrate volume (L) = Solution volume × (Concentration ÷ 100).
Adjusted concentrate volume (L) = Base concentrate × (1 + Safety factor ÷ 100) + Reserve volume.
Suggested tank size = next standard size ≥ Adjusted concentrate volume.

How to use this calculator

Select Calculation mode and your preferred flow unit.
Choose a foam type preset or use Custom.
Enter application time, safety factor, and any reserve volume.
If using devices, enable the ones operating together and input their flows.
Press Calculate. Results appear above the form.
Use the buttons in the results panel to download CSV or PDF.

FAQs

1) What does “foam concentrate” mean here?

It is the stored foam liquid that mixes with water at a set percentage to create the foam solution delivered to devices.

2) Should I size using 3% or 6% for AR-AFFF?

If the hazard includes polar solvents, use 6%. If only hydrocarbons, 3% may be acceptable. When unsure, pick worst-case for storage.

3) Why add a safety factor?

Safety factor covers uncertainties such as flow variation, proportioner tolerances, hose losses, testing consumption, and operational delays during an incident.

4) What if devices do not run at the same time?

Only enable devices expected to operate simultaneously. If operations are staged, run separate scenarios and select the largest concentrate requirement.

5) Are the results suitable for code compliance?

This tool supports engineering estimation. Always confirm assumptions with the applicable standard, authority requirements, and the foam manufacturer’s data.

6) Why does the calculator suggest a “standard tank size”?

Storage tanks come in discrete sizes. Selecting the next available size above the calculated requirement helps avoid shortfalls and supports procurement.

7) Can I use gallons instead of liters?

Yes. Enter flow in gpm, export results, and convert volumes if desired. Internally, calculations use liters for consistency.