7
Step 2: Find piping pressure loss constant.
C
P
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:
is pressure loss constant in GPM /PSI (or LPM /BAR)
is inline pressure gauge reading in PSI (or BAR)
piping
inline
2
2
Q
2
smooth
P
— P
in-line
pitot
C
=
piping
Step 3: Calculate nozzle constant.
C
Q
P
Where:
is the nozzle's constant in GPM /PSI (or LPM /BAR)
is the nozzle's nominal flow in GPM (or LPM)
is the nozzle's nominal pressure in PSI (or BAR)
nozzle
nominal
nominal
2
2
Q
2
nominal
P
nominal
C
=
nozzle
Step 4: Calculate flow.
Q
Using the pressure loss constant from step 2, the nozzle
constant from step 3, and the in-line pressure gauge reading,
the flow with a fixed orifice nozzle can be calculated with the
following equation.
Where:
is fixed orifice nozzle's flow in GPM (or LPM)
C
x C
x P
piping
nozzle
inline
(C
+ C
)
piping
nozzle
Q =
Mount a graph or table of the results adjacent to the in-line pressure gauge. Deliver any desired flow by adjustment of pump pressure.
Figure 5 gives the stream trajectory for the Industrial and Masterstream nozzles at various pressures. The graphs represent orifice
sizes of 250, 350, 500, 750 and 1000 GPM at 100 PSI. For other orifice 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%.
!
!
!
3.4 STREAM TRAJECTORY DATA
CURVE
A
B
C
D
E
GPM
FLOW
200
300
430
650
870
LBS
REACTION
100
140
200
300
400
CURVE
A
B
C
D
E
LPM
FLOW
830
1100
1600
2500
3300
KGF
REACTION
45
60
90
140
180
80
100
120
140
160
180
200
220
240
260
280
300
HORIZONTAL DISTANCE (FEET)
B
C
D
E
HORIZONTAL DISTANCE (METERS)
20
30
40
60
70
80
90
50
0
10
0
10
20
30
40
50
60
70
80
0
20
40
60
VERTICAL
DIST
ANCE
(FEET)
A
20
10
0
METERS
INDUSTRIAL AND MASTERSTREAM 1000, 75 PSI (5 BAR, 500 KPA )
HORIZONTAL DISTANCE (METERS)
0
10
20
30
40
50
60
70
80
0
20
40
60
80
100
120
140
160
180
200
220
HORIZONTAL DISTANCE (FEET)
A
B
C
D
VERTICAL
DIST
ANCE
(FEET)
240
260
280
300
E
INDUSTRIAL AND MASTERSTREAM 1000, 100 PSI (7 BAR, 700 KPA )
CURVE
A
B
C
D
E
GPM
FLOW
250
350
500
750
1000
LBS
REACTION
130
190
270
400
530
CURVE
A
B
C
D
E
LPM
FLOW
950
1300
1900
2800
3800
KGF
REACTION
60
80
120
180
240
20
30
40
60
70
80
90
50
0
10
20
10
0
METERS
©Copyright Task Force Tips, Inc. 1998-2004
LIM-035 October 5, 2004 Rev02
