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B() ()

C ()

(

)

Reference : NFPA 11 Standard for Low-, Medium-, and High-Expansion Foam

D ()

94% -97%

() C

C

C

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(Propane) (Butane)[ (LPG)](Vinyl chloride)(Butadiene)

D

D

1.

(Knockdown Speed andFlow)

2.(Heat Resistance)

3.(Fuel Resistance)()

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4. (Vapor Suppression) 100% (Reignition)

5.(Alcohol Resistance)/

ATC,AR-AFFF, AR-FFFP

(Foam Concentration)

6%

6%6 94 (Foam Solution)100 6 94

3% 3 97 Foam Solution 100

3% 6%

Foam Solution

AFFF 3% AFFF AFFF 6% (Foam Concentration) 3%6%

(Foam Concentration) 6% 3%

(Alcohol Resistant Foam) 2 3% / 6%3% 6%

AR-AFFF 3%

(Wetting Agent) A (Class A Foam) 1% 0.1%1% 0.5% 99.5

A (Storage) :

(WaterTemperature and Contaminants) :()

100F (37.7C)

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35-80F (1.6-26.6C)

(Contaminated Air) :

(Low Expansion Foam)

(Water Pressure) :50-200 PSI(/) (Proportioning Device) 200 PSI

(Unignited

Spills):

(ElectricalFires):

94-97% ()

() (Foam Sulution)

(Finished Foam) (Nozzles) (Foam Concentration)

(Proportioning Device)

(3% 97 3 100 )

(Foam Solution)(Nozzles) (Finished Foam)

(Proportioning Deviceor Proportioner)

()

(In-line Eductors,Bypass Edustors) (Around-the-Pump System)(Balanced Pressure System)

(Eductors)

(Eductors) (In-line Eductors) (Around-the-Pump System)

(Venturi Principal)

()

Foam Concentrate

Foam SolutionProportioning Device

Finished Foam

Water

Foam Nozzle

Fo am P ro d u c t i o n

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Proportioner Finished Foam

() (Metering Valve)()3% 97 3 100

1.60, 95, 125, 250 GPM(/)

95 GPM 95 GPM(Finished Foam)

2.(Inlet)

40% (Outlet) (Nozzle) (Outlet)180-200 PSI

(GPM) GPM

3. (Back Pressure)

4.

(Around-the-Pump System)

(Around-the-Pump System)

Foam Proportioner

Around-the-Pump System

Bypass Eductor :

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(Inlet) (Throat orReceiver)()

(FoamSolution) (Nozzle) (Finished Foam)

()

(Proportioner) 25-30 PSI

15%

(Balanced Pressure System)

(Foam Nozzle)

Finished Foam

Around-the-PumpSystem

(Pump Inlet Pressure) 10 PSI

(Option)

(GPM)

(Balanced Pres-

sure System)

(Venturi Principal)

(Ratio Controller)

Around-the-Pump System

(Flow Rate)

(Discharge Rate)

(Pressure) 125 PSI

Balanced Pressure System

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3

1. (Low Expansion)

(Foam Solution) 20 : 11Foam SolutionFinished Foam 8-10 Foam Solution Finished Foam

2. (MediumExpansion)

(Foam Solution) 200 : 1 50 : 1 (Low Expansion) !1% / 3%

3. (High Expansion)

(Foam Solution) 200 : 1 (High Expansion Foam)

(FirstResponse Apparatus)

(MediumExpansion Foam Concentrate) 20 200 (20-200 1)

(High ExpansionFoam Concentrate) 200 (200 1)

Low Expansion Foam

(FoamConcentration)

(Low ExpansionFoam Concentrate) 20(20 1)

Class B (Mediumand High Expansion Foam) 1,000

()

Low Expansion (Heavy Foam) Nozzle

High Expansion Foam