2.0

Table Of Contents
Chapter 6 Working with Pipes
628
Using the Darcy-Weisbach Formula
Use the Darcy Friction Factor dialog box to enter a description and an associated
Darcy-Weisbach friction factor. These values are used by the Pipes Run Editor
when calculating flow and sizing pipes.
To use the Darcy Friction Factor dialog box
1 From the Select Coefficient Table dialog box , click Darcy-Weisbach Friction
Factor to display the Darcy Friction Factor dialog box.
For more information, see Customizing the Roughness Coefficient Tables
earlier in this Chapter. The Darcy-Weisbach friction factors data is stored in a
file called darcy.cof, located in the \pipewks folder for the current project.
When a new project is created, the darcy.cof file is copied from a sample default
file in the c:\Program Files\Land Desktop R2\land\prot\pipewks program
folder. You can use an ASCII text editor to modify this data file as necessary.
2 Use the Description field to type the description of the pipe material.
3 Use the Coefficient field to type the Darcy-Weisbach friction factor for the pipe
material.
Use the /\ button to move the cursor up one cell, the \/ button to move the
cursor down one cell, the PgUp button to move the cursor up one page, and the
PgDn button to move the cursor down one page. Use the Home button to move
the cursor to the first cell, the End button to move the cursor to the last cell,
and the Delete button to delete the row for the current cell.
By entering data for a new row and clicking OK, the new row is saved. Also, if
you change a value and click OK, the darcy.cof file is updated with the new
information.