EPANET FOR PRESSURIZED PIPE SYSTEMS. WHAT IS IT?.
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“EPANET is a Windows computer program that performs extended period simulation of hydraulic and water-quality behavior within pressurized pipe networks. A network can consist of pipes, nodes (pipe junctions), pumps, valves and storage tanks or reservoirs.”
Water Supply & Water Resources Section of the
Environmental Protection Agency (Lewis Rossman)
EPANET AND MANUAL CAN BE DOWNLOADED AT
IT HAS USDA CCE CERTIFICATION
We are installing a pump in a stream to pump water to an on-farm
irrigation system. After analyzing the on farm system,
we have determined that the peak crop water requirement is 350 gpm
and the pressure requirement at the turnout is 60 psi. The location
of the pump and pipeline have already been surveyed. PVC pipe will
be used. Pump site elevation = 3500 ft
Power, hydraulic (water) : 18.97 hp
Power, brake : 26.90 hp
Minimum recommended driver rating set @ : 30.00 hp / 22.37 kW
“control the speed and torque of an AC electric motor by varying the frequency
and voltage of the electricity supplied to the motor. They replace inefficient,
energy robbing controls such as control valves, pressure reducing valves, etc.”
From Pump Affinity Laws (constant impeller diameter):
P = Power
N= Speed (rpm)
Initially we have a 10 hp pump running at 3600 rpm to meet demand and
pressure requirements in our piping system. Demand declines and the
VFD lowers the pump speed to 3200 rpm. What are the power savings?
P1 = 10 hp
N1 = 3600 rpm
N2 = 3200 rpm
P2 = 7 hp
An 11.1% speed decrease results in a 30% decrease in power
Consumption! Small speed decreases result in large energy savings.
**Demand Charge is based on the highest average 15 minute power usage for
the billing period. Demand charge kicks in at > 15 kw usage. (pacific power)
Using GIS Survey--EPANET
1) Conduct the GPS survey of water levels, pumps, pipelines,
sprinkler locations, etc.
2) Export the data from Survey Pro to a text format.
3) Read the exported text file into Excel and manipulate it into
The EPANET input format.
4) Import the nodes into EPANET
5) Draw the pipe network and begin the simulation
q = C py
q = emitter flow rate
C = discharge coefficient
p = pressure
y = pressure exponent
y = 0.5 for sprinklers/nozzles
For the rainbird 30H (SBN-3) with plug @ 50 psi:
9/64” nozzle, C = q/p0.5 = 4.1 gpm/ 500.5 = 0.580
5/32” nozzle, C = 0.707
11/64” nozzle, C = 0.863
3/16” nozzle, C = 1.018
Change the emitter coefficient in EPANET to change the