Input Curves in Overtime

Only in PIPE-FLO Overtime 2009!

Input curves allow you to specify how a device (tank, pump, control, or demand) operates during a time simulation. to start entering a custom curve, you must first click on the "(Create a new curve)" option on the left side of the window, under the "Input curves" section.  After you select the curve type, a tabular grid appears where you can enter the curve data. As you enter data, the input curve table expands as necessary and the graph on the right is updated.

Explanation of Fields:

Curve name - The name of the input curve.

Status - An input curve can either be Active or Disabled. If the status is set to disabled, the curve is ignored when a simulation is performed.

Curve Definition Box

Type - Input curves can be specified for the following types of devices: Tank, Pump, Control, or Demand.

Name - The name of the item that the curve will be applied to. The names listed correspond to the names of the items in the PIPE-FLO system.

Curve - The curve type. Examples might be Level vs. Time or Pressure vs. Level

Beyond Curve Range Box

For values not on the curve -  This indicates the action to take when values occur during the simulation that are outside of the curve range. You can specify one of three different options for curves vs. time:

  • Repeat the curve - When this option is selected, Overtime continuously reruns the curve until the time simulation is complete.
  • Stop using the curve - When this option is selected, Overtime stops using the curve and leaves the last value in place for the remainder of the time simulation.
  • End the simulation - When this option is selected, Overtime stops the time simulation when it goes beyond the curve range.

If you specify a pressure vs. level curve for a tank, there are two different options when the simulation is beyond the curve range:

  • Ignore the curve - When this option is selected, Overtime ignores the curve if the tank level is outside of the specified curve range.
  • End the simulation - When this option is selected, Overtime stops the simulation when the level goes outside of the curve range.