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Step 2: Find piping pressure loss constant.
Using the results from step 1 use the following equation to calculate the
pressure loss constant between the in-line pressure gauge and the nozzle.
Where: C
is pressure loss constant in GPM2/PSI (or LPM2/BAR)
piping
P
is inline pressure gauge reading in PSI (or BAR)
inline
Step 3: Calculate nozzle constant.
Where: C
is the nozzle's constant in GPM2/PSI (or LPM2/BAR)
nozzle
Q
is the nozzle's nominal fl ow in GPM (or LPM)
nominal
P
is the nozzle's nominal pressure in PSI (or BAR)
nominal
Step 4: Calculate fl ow.
Using the pressure loss constant from step 2, the nozzle
constant from step 3, and the in-line pressure gauge reading,
the fl ow with a fi xed orifi ce nozzle can be calculated with the
following equation.
Where: Q is fi xed orifi ce nozzle's fl ow in GPM (or LPM)
Mount a graph or table of the results adjacent to the in-line pressure gauge. Deliver any desired fl ow by adjustment of pump
pressure.
3.4 STREAM TRAJECTORY DATA
Figure 5 gives the stream trajectory for the ZN, ZM and Masterstream nozzles at various pressures. The graphs represent orifi ce
sizes of 250, 350, 500, 750 and 1000 GPM at 100 PSI. For other orifi ce sizes and pressures the graphs may be interpolated.
Notes on trajectory graphs:
•
Graphs show approximate effective stream trajectory at 30 degrees elevation in no wind conditions. Distance to last water
drops approximately 10% farther.
•
Trajectories shown are for water. The addition of foam is expected to decrease the reach by approximately 10%.
•
Tail or head winds of 20 MPH (30 KPH) may increase or decrease the range approximately 30%.
0
10
20
80
70
ZN, ZM AND MASTERSTREAM 1000, 75 PSI (5 BAR, 500 KPA )
60
50
40
30
20
A
10
0
0
20
40
60
0
10
20
80
70
ZN, ZM AND MASTERSTREAM 1000, 100 PSI (7 BAR, 700 KPA )
60
50
40
30
20
10
0
0
20
40
60
©Copyright Task Force Tips, Inc. 1998 - 2009
HORIZONTAL DISTANCE (METERS)
30
40
50
B
C
80
100
120
140
160
HORIZONTAL DISTANCE (FEET)
HORIZONTAL DISTANCE (METERS)
30
40
50
A
B
C
80
100
120
140
160
HORIZONTAL DISTANCE (FEET)
C
C
Q =
60
70
80
D
E
180
200
220
240
260
60
70
80
D
E
180
200
220
240
260
7
2
Q
smooth
=
P
— P
piping
in-line
2
Q
nominal
=
P
nozzle
nominal
C
x C
piping
nozzle
(C
+ C
piping
GPM
CURVE
FLOW
90
A
200
B
300
C
430
20
650
D
E
870
LPM
10
CURVE
FLOW
A
830
B
1100
C
1600
0
2500
D
280
300
E
3300
GPM
CURVE
FLOW
90
250
A
B
350
500
C
20
D
750
E
1000
10
LPM
CURVE
FLOW
950
A
B
1300
0
C
1900
280
300
D
2800
E
3800
LIM-035 June 15, 2009 Rev07
pitot
x P
inline
)
nozzle
LBS
REACTION
100
140
200
300
400
KGF
REACTION
45
60
90
140
180
LBS
REACTION
130
190
270
400
530
KGF
REACTION
60
80
120
180
240
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