Setting Foam Percentage - Task Force Tips Master Foam Series Instructions For Installation, Operation And Maintenance

5.3

SETTING FOAM PERCENTAGE

The foam percentage is controlled by an orifice plate that is installed in the nozzle at the mouth of the concentrate inlet. Depending on
the nozzle chosen, the Master Foam comes with orifice plates for 0.5%, 1%, 3%, or 6%. Each orifice plate is marked with the percentage
and nozzle flow rate. The flow rate on the orifice plate must match the flow rate marked on the nozzle's baffle.
The table gives the nominal rates of foam usage. Accuracy of proportioning is fairly insensitive to nozzle inlet pressure. The graph in
Figure 5.3B gives expected percentages for various inlet pressures.
Push On
Figure 5.3A
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Check For
Desired Percentage
Insert into Inlet
To Lock
Fold Levers
To Hose
8
7
6
5
4
3
2 NOMINAL 0.5%
AT 100 PSI
1
0
40 60
NOZZLE INLET PRESSURE (PSI)
10
To install the orifice plate in the nozzle, simply push it into the
bore at the foam inlet on the nozzle. The orifice plate has an
O-ring to hold it in place.
To remove the orifice plate, hook a small object (such as a
screwdriver or Allen wrench) into the hole in the orifice plate and
pull it out. Take care not to damage the orifice.
CONCENTRATE FLOW RATE IN GPM
WATER FLOW
(GPM)
250
250
500
750
1000
1250
1500
2000
EXAMPLE: 500 gpm of water at 3% uses 15.0 gpm of
concentrate.
FLOW SHOWN ARE NOMINAL. ACTUAL RESULTS MAY
VARY BASED ON BRAND AND CONDITION OF FOAM.
NOMINAL 6%
AT 100 PSI
NOMINAL 3%
AT 100 PSI
NOMINAL 1%
AT 100 PSI
80 100 120
Figure 5.3B
FOAM PERCENTAGE
0.5% 1% 3%
1.3 2.5 7.7
1.8 3.5 11.0
2.5 5.1 15.0
3.8 7.6 23.0
-- 10.0 31.0
-- 13.0 39.0
-- 16.0 45.0
-- 20.0 60.0
140 160
LIZ-030 October 29, 2020 Rev13
6%
16.0
22.0
32.0
48.0
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