©Copyright Task Force Tips LLC 2003 - 2018
LIZ-030 March 8, 2018 Rev12
13
0
1
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8
40
60
80
100
120
140
160
NOZZLE INLET PRESSURE (PSI)
FOAM PERCENT
AGE (%)
NOMINAL 0.5%
AT 100 PSI
NOMINAL 1%
AT 100 PSI
NOMINAL 3%
AT 100 PSI
NOMINAL 6%
AT 100 PSI
Fig 4.2.4c Proportioning Accuracy With Pressure Variation
Note: In any eductor type system the accuracy of proportioning depends on the viscosity of the foam concentrate. The orifi ce plates
for the MASTER FOAM nozzle have been calibrated at 70 degrees F as follows:
PERCENT
250, 350, 500 & 750 Nozzles
FOAM USED FOR CALIBRATION
0.5% and 1%
Class A foam of 20 centipoise viscosity
3%
3M ATC 3 AR-AFFF product code ATC-603
6%
3M ATC-AFFF product code FC-600F
PERCENT
1000 & 1250 Nozzles
FOAM USED FOR CALIBRATION
1%
Williams Thunderstorm ATC AR-AFFF FC-601A
3%
Williams Thunderstorm ATC AR-AFFF FC-601A
PERCENT
1500 & 2000 Nozzles
FOAM USED FOR CALIBRATION
1%
National Universal Gold NFC420
3%
National Universal Gold NFC420
Foam pickup in the widest fog position (90°) is not guaranteed.
4.2.5 USE OF FOAMJET LX
To increase the expansion ratio, Task Force Tips’ “Foamjet LX” (model FJ-LX-M) may be used on nozzles rated to 750 gpm. This
low expansion foam tube attaches and removes quickly from the nozzle. Note: As expansion ratio is increased the reach of the
nozzle will be decreased due to the greater amount of bubbles in the stream and their inability to penetrate the air. Figure 5.0.1 gives
approximate stream trajectory information with and without Foamjet LX. Actual results will vary based on brand of foam, hardness
of water, temperature, etc.
4.2.6 CLEANING AFTER USE
After educting foam it is recommended that water be educted in through the concentrate hose and inlet. This will wash out foam
concentrate residue in the hose, orifi ce plate, and nozzle passages. If not removed, any residue may dry and adversely aff ect the
accuracy of proportioning.
