Tee Junction Losses

When a branch connection of a tee junction is turned OFF, should I have a loss in the straight? There would be a friction loss for the straight however, it is so small compared with other system losses and as such is ignored by all of the relationships Ik, Miller, Crane etc.   If you wanted to include an equivalent length value for the straight based on literature, you can insert a Kf (L/D) node into the straight connection and enter the desired Kf (L/D) value from the Input tab of the Data Palette.