AR Line A line is a linear structural element between two supernodes which is identified by a line type. This means that a line type can be referred several times in the system topology description, which is convenient for modeling of systems with several identical lines (e.g. anchor systems, parallel coupled riser system etc.). The default procedure for defining the local element systems of the elements in the line are described in Line, line type and supernode connectivity - input reference. The line type contains information on cross sectional properties, element discretization, nodal components and description of internal fluid. Supernode Line Type