Setting Foam Percentage - Task Force Tips MASTER FOAM Series Instructions For Safe Operation And Maintenance

4.2.4 SETTING FOAM PERCENTAGE

The foam percentage is controlled by an orifi ce plate that is installed in the nozzle at the mouth of the concentrate inlet. Depending
on the nozzle chosen, the MASTER FOAM comes with orifi ce plates for 0.5%, 1%, 3%, or 6%. Each orifi ce plate is marked with the
percentage and nozzle fl ow rate. The fl ow rate on the orifi ce plate must match the fl ow rate marked on the nozzle's baffl e. The chart
in fi gure 4.2.4b gives the nominal rates of foam usage. Accuracy of proportioning is fairly insensitive to nozzle inlet pressure. The
graph in fi gure 4.2.4c gives expected percentages for various inlet pressures.
Check For
Desired Percentage
Insert into Inlet
Push On
Fig 4.2.4a Orifi ce Plate and Concentrate Hose Connection
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To Lock
Fold Levers
To Hose
To install the orifi ce plate in the nozzle simply push it into the bore
at the concentrate inlet on the nozzle. The orifi ce plate has an
O-ring to hold it in place.
MasterFoam 250, 350, 500 or 750 gpm
Shown in Illustration
MasterFoam 1000, 1250, 1500 or 2000 gpm
Setting Foam Percentage is Similar
To remove the orifi ce plate, hook a small object (such as a
screwdriver or Allen wrench) into the hole in the orifi ce plate and
pull it out. Take care not to damage the orifi ce. Note: The hole in
the 6% orifi ce plate is big enough that your fi nger can be used to
pull it out instead of a tool.
CONCENTRATE FLOW RATE IN GPM
WATER FLOW
(GPM)
0.5%
250 1.3
350 1.8
500 2.5
750 3.8
1000 —
1250 —
1500 —
2000 —
EXAMPLE: 500 GPM OF WATER AT 3% USES 15.0 GPM
OF CONCENTRATE
NOTE: FLOWS SHOWN ARE NOMINAL. ACTUAL RESULTS
MAY VARY BASED ON BRAND AND CONDITION OF FOAM
Fig 4.2.4b Flow Rate Chart
12
FOAM PERCENTAGE
1% 3% 6%
2.5 7.7 16.0
3.5 11.0 22.0
5.1 15.0 32.0
7.6 23.0 48.0
10.0 31.0 —
13.0 39.0 —
16.0 45.0 —
20.0 60.0 —
LIZ-030 March 8, 2018 Rev12