Restricting Flow Demand Placement on Nodes in PIPE-FLO v17
Starting in v17 of the PIPE-FLO Family of software products (Advantage, Professional, Lite, and Flow of Fluids), Flow Demands placement is restricted to the inlet or outlet of a single pipe and can no longer be placed on a Node between two pipes. This restriction was implemented to more clearly represent the Flow Demand as a system boundary (similar to the Pressure Boundary), to remove any ambiguity when the flow rate setting is entered in units of volumetric flow rate, to allow the full set of new calculated results to be displayed on the Flow Demand, and to accommodate the compressible analysis feature that was added in PIPE-FLO Advantage 17.
If a pre-version 17 file is opened and it contains a Flow Demand on the node between two pipes, a new warning (ID 216) will be triggered to warn of the potential inaccuracies and how to eliminate them by adding a short length pipe between the Node and Flow Demand.
To make changes to existing files more quickly, the Flow Demands can be group selected in the List View Window, cut from the model using Ctrl-x, then pasting them one grid square away. Add a pipe between the Flow Demands and the Nodes and enter the pipe design data.
If a model with Flow Demands on Nodes is opened in Advantage, the pipes converted to Compressible Pipes, and a compressible analysis is attempted, a new warning (ID 268) will be triggered indicating the analysis cannot be performed.