DirectLink

From SysCAD Documentation

Navigation: Models -> Other General Models

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General Description

The DirectLink (or "Flange" or "DirectIO") model is similar to a pipe but is not inserted by the user. It is automatically created as a direct link input/output (DirectIO) between two existing models in special cases. For example between a model that has a Makeup Block (MU) configured and the Makeup Source. Like the pipe, the DirectLink is used to transfer material between two units in SysCAD. There are no user configurable options in this model that might affect it's behaviour.

In dynamic mode, a DirectLink link may be created between surge units and the plant area for purpose of spills and vents.

The graphics symbol for a DirectLink connection is managed differently to a normal link or unit symbol. Typically a small symbol may be shown next to the applicable unit. The graphics symbol can be changed in the same way as other graphics symbols in SysCAD using the Change Symbol command. The graphics symbol can also be replaced by a pipe drawn by the user using the Redraw Link command.

Whatever graphics symbol is chosen or drawn, it can be hidden from the flowsheet using the Associated Graphics command.

Model Theory

Material flows from the source unit to the destination unit without any change.

Data Sections

The default sections and variable names are described in the following table. The number of Tabs in the access window may increase or decrease, based on user configuration.

1. The first section, which has the same name DirectLink, contains general information relating to the unit
2. The second section, Qo, displays the material properties for the stream flowing through the Direct Link.
3. The third section displays the specie makeup of the stream flowing through the Direct Link. The name of the Tab will reflect the view chosen by the user, i.e. the default view is Mass Flow and hence the tab will be called Qm. If the user changes the view to Mass Fraction the Tab name will change to MF.
4. The Info section contains general settings for the unit and allows the user to include documentation about the unit and create Hyperlinks to external documents. This is fully described in Common Data Sections.

Class: DirectLink - The first tab page in the access window will have this name.

Tag / Symbol	Input / Calc	Description
Common First Data Section
SubClass	Display	This will display the type of Direct Link, i.e. Makeup, Spill, vent, etc.
SrcTag	Display	The tag of the source unit. For example it may come from a Makeup Source.
DstTag	Display	The tag of the destination unit.
Qo Material Flow Section