Hunter I-60 Series Product Information page 20

OVERALL CONCLUSION: I-60 IS THE ONE
As both of these examples demonstrate, the I-60 rotor not only delivers high performance, but it does so in an
economical manner that other rotors are hard pressed to match. Whether you are dealing with a retrofit appli-
cation or an entirely new installation of an irrigation system, if you have a landscape that encompasses a large
expanse of turf and you are dealing with low operating pressures, no rotor offers a better solution than the new
Hunter I-60.
CALCULATIONS
EXAMPLE 1 - RETROFIT/OPTION 1
ESTIMATED WHOLESALE COST OF PUMP INSTALLATION:
5 hp Booster Pump:
Pump Enclosure:
Pump Start Relay:
Flow Switch:
Concrete:
Pipe/Fittings:
Electrical Service/Hookup:
Installation Labor (18 hours):
TOTAL COST:
YEARLY ELECTRICAL ENERGY COST:
Energy use on 5 hp pump (at 69% eff.)
Electricity cost from Utility Co.
6.723 kWh x 501.6 operating hrs
3,372.3 kWh x $ 0.10 kWh
TOTAL COST:
PUMP RUN TIME CALCULATIONS
Rotor Precipitation Rate = .53 in/hr.
ET avg. = .27 in/day6 zones x 3.5 hrs/week @ 4 weeks
ET avg. = .20 in/day6 zones x 2.6 hrs/week @ 4 weeks
ET avg. = .15 in/day6 zones x 2.0 hrs/week @ 8 weeks
ET avg. = .12 in/day6 zones x 1.6 hrs/week @ 16 weeks
ET avg. = .08 in/day6 zones x 1.1 hrs/week @ 12 weeks
YEARLY PUMP OPERATING TIME
CALCULATIONS
EXAMPLE 2 - NEW DESIGN
APPROXIMATE SYSTEM PRESSURE LOSS COMPUTATIONS:
2" Meter (100 gpm max.)
3" CL 200 Service Main-90' length,
2" Reduced Pressure Backflow
3" CL 200 Main-500' length
2" ICV Valve (100 gpm)
PVC Laterals
PVC Fittings/Misc.
TOTAL LOSSES:
PIPE BETWEEN HEADS:
For I-60 system: 58' pipe between each head x 160 rotors = 9,280 feet of pipe.
For I-25 system: 44' pipe between each head x 260 rotors = 11,440 feet of pipe.
20
MATERIAL COST RATIO ESTIMATE:
The I-25 system will require 23.2% more material.
Compare the amount of pipe used for the I-25 system vs. the I-60 system (11,440'/9,280' = 1.232).
LABOR COST RATIO ESTIMATE:
$ 920
The I-25 system will require 62.5% more installation labor hours.
$ 400
$ 45
Compare the number of rotors needed for the I-25 system vs. the I-60 system (260/160 = 1.625).
$ 80
$ 100
CALCULATIONS
$ 80
$ 375
EXAMPLE 1 - RETROFIT/OPTION 2
$ 787
$2,787
ESTIMATED WHOLESALE COST OF ROTOR INSTALLATION:
30, I-60 Rotors:
Labor Cost ($25 per rotor):
6.723 kW/hour
TOTAL COST:
$ 0.10 kWh.
3,372.3 kWh
$ 337
$ 337
84.0 hours
62.4 hours
96.0 hours
153.6 hours
105.6 hours
501.6 hours
8 psi max. loss
1 psi loss
13 psi loss
4 psi (0.8 psi/100') loss
4 psi loss
3 psi loss
3 psi loss
36 psi loss.
$1,888
$ 750
$2,638