Flow Characteristics Of Masterstream Fixed Nozzle; Determining Flow With Pre-Piped Monitors - Task Force Tips ZN Series Instructions For Installation, Safe Operation And Maintenance

3.2 FLOW CHARACTERISTICS OF MASTERSTREAM 1000 FIXED NOZZLE
The Masterstream 1000 Fixed Flow Nozzle is set to the desired fl ow by adjusting the baffl e and locking it in place with a jam nut. The
nozzle is adjusted and fl ow tested at the factory at time of order. If the baffl e is moved (for example to fl ush the nozzle), then the baffl e
must be readjusted to obtain the desired fl ow. Refer to fi gure 3.0 for baffl e position to achieve a certain fl ow and pressure. Figure 4
gives relationship of fl ow and pressure for various orifi ce sizes.
1000
180
160
140
120
100
80
60
40
200 300
FIG 4 - Nozzle fl ow vs. baffl e turns from closed position for Masterstream Fixed Nozzle
An inadequate supply of nozzle pressure and/or fl ow will cause an ineffective stream and can
WARNING
result in injury, death or loss of property.

3.3 DETERMINING FLOW WITH PRE-PIPED MONITORS

The simplest procedure to determine fl ow is with a fl ow meter. If a fl ow meter is unavailable then the fl ow 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.
Step1: Determine fl ow of smooth bore nozzle.
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 fl ow is calculated from the Freeman formula:
Where: F = 29.71 for English units (GPM, INCHES, PSI)
©Copyright Task Force Tips, Inc. 1998 - 2009
NOZZLE FLOW (LPM)
2000
2 turns 3 turns
400 500 600 700
NOZZLE FLOW (GPM)
Q = F x D
nozzle
F = .667 for metric units (LPM, MM, BAR) Note: 1 BAR=100 KPA
Q is smooth bore nozzle fl ow in GPM (or LPM)
nozzle
D is nozzle exit diameter in INCHES (or MM)
P is pitot pressure in PSI (or BAR)
pitot
3000 4000
4 turns 5 turns
800 900 1000 1100 1200 1300 1400
2
P
pitot
6
5000
12
6 turns 7 turns
10
LIM-035 June 15, 2009 Rev07
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6
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