EPANET FOR PRESSURIZED PIPE SYSTEMS

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EPANETFOR PRESSURIZED PIPE SYSTEMS
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WHAT IS IT?

• 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.

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WHO DEVELOPED IT?
Water Supply Water Resources Section of the
Environmental Protection Agency (Lewis Rossman)
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WHERE CAN I GET IT?
EPANET AND MANUAL CAN BE DOWNLOADED
AT http//servicecenter.kcc.usda.gov/sfw_e_l.htm
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• ADVANTAGES OF USING EPANET
• SURVEY DATA CAN BE READ INTO PROGRAM (A LITTLE
  EDITING IN EXCEL)
• ALL CALCULATIONS ARE DONE INTERNALLY AND QUICKLY
• GRAPHICS, SUMMARY OUTPUT TABLES
• EASY TO CHECK OTHER PERSONS WORK
• CHANGES ARE QUICK AND EASY
• UNLIMITED NETWORK SIZE AND COMPLEXITY (LOOPED
  SYSTEMS, ETC.)
• ERROR CHECKING AND WARNINGS
• DISADVANTAGES OF USING EPANET
• HAVING TO LEARN THE PROGRAM (CAN TAKE SOME
  TIME).

IT HAS USDA CCE CERTIFICATION
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Program components

• Lets check out the various components with a
  simple example.
• A gravity pipe running from a diversion to a pond

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EXAMPLE PUMPED SYSTEM PROBLEM
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

• Determine the
• Pump selection to deliver the flow and pressure
  to the turnout
• Pressure rating of the pipe
• Daily electrical costs to run the pump

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GPS Survey Pro Exported Text File
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EPANET NETWORK INPUT FILE (.inp)
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Import file
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(No Transcript)
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From Berkeley Pump Selection Software, Q 350
gpm, TDH 215 ft Power, hydraulic (water)
18.97 hp Power, brake 26.90 hp Minimum
recommended driver rating set _at_ 30.00 hp /
22.37 kW
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Electronic Variable Frequency Drives (VFDs)
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.
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Why Use VFDs?
From Pump Affinity Laws (constant impeller
diameter) P1/P2 (N1/N2)3 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.
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The Real Cost of Electricity-Whats On Your Bill!
Example Bill
Demand Charge is based on the highest average
15 minute power usage for the billing period.
Demand charge kicks in at gt 15 kw usage. (pacific
power)
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Pump Example
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Summary of Pipeline/Irrigation Projects 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
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Sprinkler Simulation EPANET
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Emitter-Sprinkler Orifice Equation
q C py q emitter flow rate C discharge
coefficient p pressure y pressure exponent y
0.5 for sprinklers/nozzles
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(No Transcript)
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Calculate the Emitter Coeficients for the Varying
Nozzles For the rainbird 30H (SBN-3) with plug _at_
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 Sprinkler/nozzle.
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Questions ?