Is it possible to change the invert elevation for a pressure pipe? The properties "Set Invert to Start/Stop?" are grayed out and unavailable to change.
If the pressure pipe is connected to a pressure element, such as a pressure junction or a pump, the invert elevation will simply be the elevation of the end node. In such a case, the invert elevation cannot be changed in the pipe properties and must be changed by adjusting the node elevation. There would be no hydraulic impact of changing the invert of the pressure pipe (where it connects to the pump, for example the connecting elevation inside a wetwell) as the pump will operate based on the upstream and downstream boundary conditions (wetwell HGL and receiving gravity node elevation, respectively).
However, if the pressure pipe is connected to a gravity element (wet well, manhole, or outfall), you can change the invert elevation of the pipe to something other than the invert elevation of the end node. When the pressure pipe is connected to a gravity element, you will be able to change "Set Invert to Start?" or "Set Invert to Stop?"
Conduit stop invert automatically connecting to wet well minimum elevation