Have you ever came across your pipes in section view and they look like octagons rather than the nice 12” RCP that you drew in plan view? If so this is caused by the setting FACETDEV described in the HELP menu: Networks in Profile and Section Views
The number you specify for facet deviation defines the maximum distance from the chord to the arc—the chord being an edge that is created from faceting the curve to the true mathematical arc. The facet deviation has a range of greater than zero (0) and no upper limit. The lower this variable is set, the more segments will be used to draw the pipe. The minimum number of segments is 8.
Hope this helps!