A customer called today asking how to enter a 1″ black plastic underground pipe for the calc. This particular situation sounded unique enough that I did not tell him to add that pipe type to our database, as I would have if he expected to see this pipe type used repeatedly. I told him to just enter in the pipe info directly into the calculation by entering the actual diameter (not nominal) and the C-Factor:
This is all that is needed by the program to calculate the friction loss. The Dia. column can contain entirely Actual diameters, or Nominal, or a mix of both.
When the calculation is initiated, a dialog box will appear for each unique pipe diameter, asking you what nominal diameter it represents:
I picked 1″, as that is what the nominal diameter in this example was. This value is recorded in the data, so you will not be asked again for the nominal for this particular diameter.
The H-Factor 
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