Nozzle Couplings; Flow Characteristics - Task Force Tips FM Series Instructions For Safe Operation And Maintenance

2.2 NOZZLE COUPLING
NH (National Hose Threads per NFPA #1963) threads are standard on all nozzles. Other threads such as NPSH (National
Pipe Straight Hose threads per ANSI/ASME #B1.20.7) can be specified at time of order.
CAUTION
CAUTION

3.0 FLOW CHARACTERISTICS

The opening size of the Metro II may be field set to any one of the seven different sizes. At each flow setting the nozzle is
set to a predetermined fixed orifice. Relationship of flow and nozzle pressure at each setting is shown in figure 2.
190
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
0 50
190
300
250
200
150
100
50
0
0 50
4
©Copyright Task Force Tips, Inc. 2002
Nozzle must be properly connected. Mismatched or damaged threads may cause nozzle
to leak or uncouple under pressure and could cause injury.
Dissimilar metals coupled together can cause galvanic corrosion that can result
in the inability to unscrew the threads of complete loss of thread engagement
over time. Per NFPA 1962 (1998 edition), if dissimilar metals are left coupled
together an anti-corrosive lubricant should be applied to the threads. Also the
coupling should be disconnected and inspected at least quarterly.
METRO II FLOW CHART
380 550
100 150
METRO II FLOW VS. REACTION FORCE
380 550
100 150
FLOW (L/min)
750 950 1140
200 250 300
FLOW (GPM)
FLOW (L/min)
750 950 1140
200 250 300
FLOW (GPM)
1325 1525 1700
175 GPM @ 100 PSI (K=17.5)
185 GPM @ 75 PSI (K=21.4)
200 GPM @ 75 PSI (K=23.1)
250 GPM @ 50 PSI (K=35.4)
250 GPM @ 75 PSI (K=28.9)
250 GPM @ 100 PSI (K=25.0)
325 GPM @ 100 PSI (K=32.5)
350 400 450
1325 1525 1700
136.1 kgf
113.4 kgf
90.7 kgf
68.0 kgf
45.4 kgf
175 GPM @ 100 PSI (K=17.5)
185 GPM @ 75 PSI (K=21.4)
200 GPM @ 75 PSI (K=23.1)
250 GPM @ 50 PSI (K=35.4)
22.7 kgf
250 GPM @ 75 PSI (K=28.9)
250 GPM @ 100 PSI (K=25.0)
325 GPM @ 100 PSI (K=32.5)
350 400 450
LIN-040 April 2, 2002 Rev 0
10.34 bar
9.65 bar
8.96 bar
8.27 bar
7.58 bar
6.90 bar
6.20 bar
5.52 bar
4.83 bar
4.12 bar
3.45 bar
2.76 bar
2.07 bar
1.38 bar
0.69 bar