4
©Copyright Task Force Tips, Inc. 2002
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.
2.2 NOZZLE COUPLING
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.
CAUTION
Nozzle must be properly connected. Mismatched or damaged threads may cause nozzle
to leak or uncouple under pressure and could cause injury.
CAUTION
METRO II FLOW VS. REACTION FORCE
0
50
100
150
200
250
300
0
50
100
150
200
250
300
350
400
450
FLOW (GPM)
RE
AC
TI
O
N
FO
RC
E
(L
B
F)
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)
190
380
550
750
950
1140
1325
1525
1700
FLOW (L/min)
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.
22.7 kgf
45.4 kgf
68.0 kgf
90.7 kgf
113.4 kgf
136.1 kgf
METRO II FLOW CHART
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
0
50
100
150
200
250
300
350
400
450
FLOW (GPM)
PR
ESSU
R
E
(PSI
)
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)
190
380
550
750
950
1140
1325
1525
1700
FLOW (L/min)
3.45 bar
2.76 bar
2.07 bar
1.38 bar
0.69 bar
6.90 bar
6.20 bar
5.52 bar
4.83 bar
4.12 bar
10.34 bar
9.65 bar
8.96 bar
8.27 bar
7.58 bar
LIN-040 April 2, 2002 Rev 0
