Controlling Fluid Levels in a Tank

When you need to handle a tank which has defined Upper Critical Level, Upper Level, Lower Level and Lower Critical Level. Once an upper/lower level (upper/lower) is triggered the supply/output pump slows/fastens according to the trigger. Once a critical level (upper/lower) is triggered the supply/output pump is turned off.

Where to Find the Model Object

The following model object can be found in the model objects directory:

• Misc \ Controlling Fluid Levels in a Tank

Difficulty Level

• Ease of Use: Moderate
• Ease of Modification: Moderate

How to Use the Model Object

1. Open Your Model: Open your model or create a new blank model.
2. Insert the Model Object into Your Model
   1. Locate the model object Controlling Fluid Levels in a Tank and select the insert button.
   2. Move the cursor to the point of insertion and left mouse-click. The upper left corner of the model object will be inserted at the location of the mouse-click.
3. Connect to Your Model
   1. Connect entity arrivals or a percentage route from your model to Pump1.
   2. Connect a percentage route from Pump2 to the rest of your model.
4. Define Values: Define the values for scenario parameters s_Activity_Name1, s_Gal_Min_P1, s_Gal_Min_P2, s_Gal_Min_UL_P1, s_Gal_Min_UL_P2, s_LCL1, s_LL1, s_Meter_Checking_Interval1, s_Tank_Volume, s_UCL1, and s_UL1 based on the information provided under the heading Scenario Parameters below. The values for these Scenario Parameters must be provided before the simulation start.
5. Completion: The model object is now integrated into your model, you should now be able to save and then simulate the model.

Controls Usage

Variables:

1. v_Block_Size: Do not change. Is used to display meter status. Does not require any changing.
2. v_Gal_Min_P1: Do not change. Is used for the speed of the pump, if you need to change the value, change it in the Action Logic of Pump Controller 1.
3. v_Gal_Min_P2: Do not change. Is used for the speed of the pump, if you need to change the value, change it in the Action Logic of Pump Controller 1.
4. v_Status_P1: Do not change. Is used to tell the model whether to turn the pump 1 on or off.
5. v_Status_P2: Do not change. Is used to tell the model whether to turn the pump 2 on or off.

Scenario Parameters:

1. s_Activity_Name1: User input required. Is the name of the tank.
2. s_Meter_Checking_Interval1: User input required. Is the time interval to check the level of the tank to display in the meter.
3. s_Tank_Volume: User input required. Is the volume that the tank can contain.
4. s_UL1: User input required. Is the upper limit.
5. s_LL1: User input required. Is the lower limit.
6. s_UCL1: User input required. Is the upper critical limit.
7. s_LCL1: User input required. Is the lower critical limit.
8. s_Gal_Min_P1 – 2: User input required.  Is the gallon per minute value for pump 1 and pump 2.
9. s_Gal_Min_UL_P1 – 2: User input required. Is the gallon per minute value for pump1 and pump2, when the upper or lower limit is reached.