Operation; Pattern Control; Determining Flow With Pre-Piped Monitors - Task Force Tips MASTERSTREAM Series Instructions For Installation, Safe Operation And Maintenance

6.0 OPERATION

6.1 PATTERN CONTROL

TFT's Masterstream with Flush Series nozzles have full pattern control from straight stream to wide fog. On models with manual
shapers, turning the stream shaper clockwise (as seen from the operating position behind the nozzle) moves the shaper to the
straight stream position.
Since the stream trim point varies with fl ow, the nozzle should be "trimmed" after changing the fl ow to obtain the straightest and
farthest reaching stream. To properly trim a stream, fi rst open the pattern to narrow fog. Then close the stream to parallel to give
maximum reach. Note: Turning the shaper further forward will cause stream crossover and reduce the effective reach of the nozzle.

6.2 DETERMINING FLOW WITH PRE-PIPED MONITORS

The simplest procedure to determine fl ow with automatic nozzles 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)
F = .667 for metric units (LPM, MM, BAR) Note: 1 BAR=100 KPA
Q fl ow in GPM (or LPM)
smooth
D exit diameter in INCHES (or MM)
P pitot pressure in PSI (or BAR)
pitot
Step 2: Find 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 piping pressure loss constant in GPM2/PSI (or LPM2/BAR)
P in-line pressure gauge reading in PSI (or BAR)
inline
Step 3: Calculate fl ow with automatic nozzle.
Using the pressure loss constant from step 2 and the following equation, the fl ow with an automatic nozzle can be calculated for your
particular installation.
Where: Q automatic nozzle fl ow in GPM (or LPM)
auto
P nominal nozzle operating pressure in PSI (or BAR)
auto
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.
©Copyright Task Force Tips, Inc. 2015
Q = F x D
smooth
C =
P
Q =
auto
9
2 P
pitot
Q 2
smooth
- P
in-line pitot
(P - P
in-line auto
LIM-045 September 15, 2015 Rev00
)C