6
3.2 FLOW CHARACTERISTICS OF MASTERSTREAM 1000 FIXED NOZZLE
The Masterstream 1000 Fixed Flow Nozzle is set to the desired flow by adjusting the baffle and locking it in place with a jam nut. The
nozzle is adjusted and flow tested at the factory at time of order. If the baffle is moved (for example to flush the nozzle), then the baffle
must be readjusted to obtain the desired flow. Refer to figure 3.0 for baffle position to achieve a certain flow and pressure. Figure 4 gives
relationship of flow and pressure for various orifice sizes.
FIG 4 - Nozzle flow vs. baffle turns from closed position for Masterstream Fixed Nozzle
NOZZLE FLOW (LPM)
40
60
80
8
10
12
6
4
100
120
140
160
180
1000
3000
2000
4000
5000
200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400
NOZZLE FLOW (GPM)
NOZZLE
PRESSURE
(PSI)
NOZZLE
PRESSURE
(BAR,
KP
A/100)
7 turns
6 turns
5 turns
4 turns
3 turns
2 turns
Step1: Determine flow of smooth bore nozzle.
Q
D
P
Flow water with a smooth bore nozzle and record the nozzle's size, pitot pressure and in-line pressure gauge reading. The smooth
bore nozzle's flow is calculated from the Freeman formula:
Where:
F =29.71 for English units (GPM, INCHES, PSI)
F=.667 for metric units (LPM, MM, BAR) Note: 1 BAR=100 KPA
is smooth bore nozzle flow in GPM (or LPM)
is nozzle exit diameter in INCHES (or MM)
is pitot pressure in PSI (or BAR)
nozzle
pitot
An inadequate supply of nozzle pressure and/or flow will cause an ineffective stream and can result
in injury, death or loss of property.
3.3 DETERMINING FLOW WITH PRE-PIPED MONITORS
The simplest procedure to determine flow is with a flow meter. If a flow meter is unavailable then the flow may be estimated using
pressure loss data between the nozzle and an in-line pressure gauge at the pump or considerably upstream from the nozzle. Data is
taken with a smooth bore nozzle and handheld pitot gauge. Note: equations assume no substantial change in elevation between in-
line pressure gauge and nozzle.
Q
= F x D
P
nozzle
pitot
2
WARNING
©Copyright Task Force Tips, Inc. 1998-2004
LIM-035 October 5, 2004 Rev02
