Page 283 - Fair, Geyer, and Okun's Water and wastewater engineering : water supply and wastewater removal

JWCL344_ch07_230-264.qxd 8/2/10 8:44 PM Page 243

7.7 Automated Optimization 243

• Move your mouse horizontally to the right to place a pump. Right-click and select Pump
from the pop-up menu, then left-click to place the pump.
• Repeat the process for the tank by selecting Tank from the pop-up menu.
• Now, place the junction node “Linen Factory.” After placing the junction, right-click and
select Done.
• Continue by entering the remaining two pumps and four pipes in the same way as de-
scribed previously. To connect a pipe to an object on the layout screen, click the object
while in the pipe layout mode. The object should turn red when it is selected.
• Except for the scale, your schematic should look roughly like the one given in the problem
statement.
• To exit the pipe layout mode, click the arrow button on the vertical toolbar on the left
side of the layout screen.

Entering the Data
• Double-click the reservoir node to open its dialog editor. Change the name to “Pond” in
the Label field. Enter 58 m in the Elevation field. Close the dialog editor.
• Double-click the tank. Enter the given diameter for the circular section and the appropri-
ate elevations from the problem statement. Disregard the inactive volume field. Be sure
that Elevation is selected in the Operating Range Type field. Close the dialog editor.
• Double-click the bottom pump. Change the name to “PUMP-1” in the Label field. Enter
the appropriate elevation from the pump data table (Table 7.2) into the Elevation field.
Click the Pump Definition field and select Edit Pump Definitions to open the Pump
Definitions dialog. Add a new pump definition and label it “Pumps 1 and 2.” In the Head
tab select Standard (3 Point). Enter the pump curve data given for PUMP-l. If you need
to change the units, right-click on the Flow or Head table headings and open the “Units
and Formatting” dialog. Click Close to close the Pump Definition dialog. Now select
“Pumps 1 and 2” in the Pump Definitions field. Close the dialog editor.
• Repeat the above process for the other pumps. When entering the data for PUMP-3, you
will have to create a new pump definition titled “Pump 3” for the Pump Definitions field.
• Next, enter the pump controls given in the problem statement. Click Controls in the
Components menu.
• Select the Conditions tab to enter the five Tank conditions as described from the problem
statement information. Enter each condition as New and Simple. The Condition Type is
Element; select the Tank from the layout screen by clicking the ellipse button ; select
Hydraulic Grade as the Tank Attribute; the Operator and Hydraulic Grade are en-
tered based on the problem statement information.
• Select the Actions tab to enter whether the pump is on or off. The default setting is
generally with the pumps on. Enter the six actions (each pump either on or off) as New
and Simple. For example, to turn off PUMP-1, the Element is entered by clicking the
ellipse button and selecting PUMP-1 from the layout screen; the Pump Attribute
would be Pump Status; the Operator would be the default “ ”; then select Off for the
Pump Status.
• Select the Controls tab to enter the six controls. The controls are all Simple and entered as
If Then statements. For example, click New then the Evaluate as Simple Control box; in
the IF Condition field, select {“Tank” level 106.00 m}; in the THEN Action field, select
{“PUMP-1” pump status off}. Close the Controls dialog.
• Double-click the junction node. Change the name to “Linen Factory.” Enter 58 m in the
Elevation field. Click the Demand Collection field to enter a fixed demand of 20 L/s after
clicking the ellipse button. Close both dialog editors.