©Copyright Task Force Tips LLC 2003-2020
5
LIU-030 August 24, 2020 Rev10
4.0 FLOW CHARACTERISTICS
Figure 4.0A
Figure 4.0B
5.0 FOAM SELECTION
In any eductor type system the accuracy of the foam concentrate to water ratio will depend upon the viscosity (thickness) of the foam
concentrate. The more viscous, or thick, the foam concentrate, the greater the amount of energy required to draw the concentrate into
the eductor. The viscosity of most foam concentrates changes with temperature, with some thickening to a gel at temperatures of 40ºF
(4ºC).
The PRO/pak percentage knob has two sides, the green Class A side was calibrated for 20 Centipoise Class A foam concentrates and
the red, Class B, side was calibrated with National Foam’s Universal Gold® AFFF concentrate.
Actual foam concentrations may vary with changes in water flow, foam concentrate temperature, and viscosity. The user must verify that
the performance of the concentrate is suitable for the application. In all cases, follow the concentrate manufacturer’s recommendation.
WARNING
Agent concentrates can be ineffective if not used at the correct concentration ratio. Ineffective
agents can increase the potential for injury or death. Ensure that the Percentage Knob is set to the
correct concentration ratio for the type of agent being used prior to flowing.
0
0
FLOW (GPM)
PRO/pak FLOW CHARACTERISTICS (with valve fully open)
INLET PRES
SURE (PSI)
20
18
2
6
16
14
12
10
4
24 26
22
8
28
50
150
350
250
450
100
300
200
400
500
MAXIMUM OPERATING
PRESSURE = 500 PSI
MINIMUM OPERATING
PRESSURE = 40 PSI
0
0
FLOW (L/MIN)
50
40
30
10
60
20
70
80
100
90
2
6
14
10
18
4
12
8
16
22
20
24
26
28
30
PRO/pak FLOW CHARACTERISTICS (with valve fully open)
MAXIMUM OPERATING PRESSURE = 40 BAR
MINIMUM OPERATING PRESSURE = 3 BAR
INLET PRES
SURE (BAR)
100
MINUTES TO USE 2-1/2 GALLONS OF
CONCENTRATE AT 12 GPM
PERCENT
MINUTES
0.1
208
0.2
104
0.3
69
0.4
52
0.5
42
1
21
3
7
6
3.5
MINUTES TO USE 10 LITRES OF
CONCENTRATE AT 45 l/min
PERCENT
MINUTES
0.1
208
0.2
104
0.3
69
0.4
52
0.5
42
1
21
3
7
6
3.5
