Results
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Concentrate Flow Rate
gpm
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Total Concentrate Required
gal
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Recommended Tank Size
gal
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Foam Solution Flow Rate
gpm
Note: Proportioning accuracy is critical - too little concentrate reduces effectiveness, too much wastes material. Bladder tanks are most common for fixed systems. Line eductors require specific inlet pressure ranges.
Reference
NFPA 11 Low-Expansion Foam Systems
Concentrate flow: Qc = Qw × (C%/100) / (1 - C%/100)
Common concentrations: 1%, 3%, 6%
Bladder tank standard sizes: 55-3000 gal
Discharge duration per NFPA 11:
Hydrocarbon: 15 min minimum
Polar solvent: 20 min minimum
Proportioning accuracy: ±1% to +40%/-30% of rated