Most of the Pipe Flow Expert functions can be performed by using a button on the tool bar. The Re-Design, Results Sheet, Results PDF and Show Log buttons are only available on the tool bar after you click the Calculate button on the tool bar. 

The tool bar also contains a field for determining whether the unit values displayed in Pipe Flow Expert and the pipe system are imperial or metric. The first step in creating a pipe system is to select the Imperial or Metric option. You can define whether imperial or metric values are used from the tool bar, the Units menu, or from the Units tab in the Configuration Options dialog. Inches, feet, and gallons are examples of imperial units. Centimeters, meters, and liters are examples of metric units.