©Copyright Task Force Tips, Inc. 2004 - 2017
LIU-330 November 16, 2017 Rev08
8
4.3 FOAM COMPATIBILITY
CAUTION
Do not mix diff erent types of foam concentrates or foams of the same type from diff erent
manufacturers. Mixing of foam concentrates can cause the contents of the foam tank to gel and
produce unpredictable results. Clean tank and foam passages thoroughly when changing foam
types.
Medium Expansion Nozzle
— produces the greatest expansion ratios. It should be used on Class B fuels for vapor suppression and
Class A fuels when a longer lasting insulating layer of drier foam is desired.
Low Expansion Nozzle
— can be used with either Class A or B foam solutions. Reach is slightly less than the smooth bore. It should
be used on Class B fi res for extinguishment and Class A fuels to soak the fuel with a wet foam solution.
Straight Stream Nozzle
— is for Class A foam solutions. Foam expansion will be negligible. It should be used where maximum reach
or penetration is desired.
4.4 FOAM CONSUMPTION
The following tables indicate the theoretical foam concentrate fl ow rate and the time it will take to empty a 5 gallon (18.9 liters)
container of various concentrates with eductors of diff erent ratings.
60 GPM (225 l/min) Eductor
Setting
Foam
Class
Time To Empty
5 G (18.9 L)
Foam Flow
Rate
1/4%
A
33 min 20 sec
0.15 gpm
0.57 l/min
1/2%
A
16 min 40 sec
0.3 gpm
1.14 l/min
1%
B
8 min 20 sec
0.6 gpm
2.27 l/min
3%
B
2 min 47 sec
1.8 gpm
6.81 l/min
6%
B
1 min 23 sec
3.6 gpm
13.62 l/min
95 GPM (360 l/min) Eductor
Setting
Foam
Class
Time To Empty
5 G (18.9 L)
Foam Flow
Rate
1/4%
A
20 min 50 sec
0.24 gpm
0.9 l/min
1/2%
A
10 min 25 sec
0.5 gpm
1.89 l/min
1%
B
5 min 16 sec
1.0 gpm
3.78 l/min
3%
B
1 min 45 sec
2.9 gpm
10.97 l/min
6%
B
53 sec
5.7 gpm
21.57 l/min
120 GPM (450 l/min) Eductor
Setting
Foam
Class
Time To Empty
5 G (18.9 L)
Foam Flow
Rate
1/4%
A
16 min 40 sec
0.29 gpm
1.09 l/min
1/2%
A
8 min 20 sec
0.58 gpm
2.18 l/min
1%
B
4 min 10 sec
1.25 gpm
4.72 l/min
3%
B
1 min 23 sec
3.65 gpm
13.8 l/min
6%
B
42 sec
7.2 gpm
27.25 l/min
125 GPM (475 l/min) Eductor
Setting
Foam
Class
Time To Empty
5 Gallons
Foam Flow
Rate
1/4%
A
16 min
0.3 gpm
1.14 l/min
1/2%
A
8 min
0.6 gpm
2.27 l/min
1%
B
4 min
1.3 gpm
4.92 l/min
3%
B
1 min 20 sec
3.8 gpm
14.38 l/min
6%
B
40 sec
7.5 gpm
28.38 l/min
1. The class A foam used for calibration is the “Knock Down” from
National Foam. The calibration viscosity is 20 Centipoise.
2. The class B foam used for calibration is the “Universal Plus 3%
/6% Alcohol Resistant Aqueous Film Forming Foam” (AR-AFFF)
from National Foam. The calibration viscosity is 2892 centipoise
tested with Brookfi eld #3 Spindle @ 30 rpm.
3. TFT’s eductors were calibrated with 1 ¾” Conquest Hose.
UE-060-NF calibration hose length is 300 ft.
UE-095-NF calibration hose length is 250 ft.
UE-125-NF calibration hose length is 150 ft.
Actual calibrated rate for each setting and the
foam concentrate used for calibration
SETTING
ACTUAL RATE
FOAM
CLASS
UL-162
TOLERANCE
1/4%
0.287%
A
.25 - .325%
1/2%
0.575%
A
.5 - .65%%
1%
1.15%
B
1 - 1.3%
3%
3.45%
B
3 - 3.9%
6%
6.5%
B
6 - 7.8%
