By now many of you have had time to "play around" with the new Pressure Pipes functionality, and to also get a good feel for how in works within Civil 3D 2013. You may have noticed and used the Follow Surface command in the profile editing contextual ribbon. This handy tool will allow you to force your pressure network to follow the specified surface at a specific depth. It works just as expected, and much like the old workflow (feature line>elevations from surface>lower feature line>create pipe network from object) many people used to simulate pressure networks with gravity systems.
After the network has "followed" the surface you will see that the network will be segmented to reflect the new vertical path that the follow surface command produced. These segment lengths are specified in the catalog and can be changed based on your requirements.
If you need to change this just open the Content Catalog Editor (START>PROGRAMS>AUTODESK>AUTOCAD CIVIL 3D 2013>CONTENT CATALOG EDITOR) and open the SQLITE file that contains the pipe. Typically found here:
C:\ProgramData\Autodesk\C3D 2013\enu\Pressure Pipes Catalog\Imperial
Find the Cut Length column and edit accordingly. Your new networks created after this edit will reflect this new Cut Length next time you run this command.