
6-2 Introduction
6-2
6.1 Introduction
The User Unit Operation is a HYSYS unit operation much like any
other, except that its behaviour is defined entirely with Visual
Basic® compatible code that you provide. It allows you to create
additional unit operation types without the complexity involved
in creating an Extension Unit Operation.
With properly designed code, a user-defined unit operation type
can be seamlessly integrated in to HYSYS cases and for use by
third parties. However, this level of sophistication and user-
friendliness is not necessary for all user ops - you may want to
quickly create a type that is specialized for use in specific
situations or at a specific location in a case.
6.2 Adding a User Unit
Operation
Adding a User Unit Operation to a case requires you to follow a
slightly different procedure than is normally followed when
adding the standard HYSYS unit operations. Before you can add
the initial User Unit Operation to a case, you must first create an
operation Type. The Type is simply a classification for the User
Unit Operation, much like Pumps or Heaters are types for unit
operations that currently exist in HYSYS.
To add a User Unit Operation:
1. Do one of the following:
• Open the Object Palette (press F4) and double-click the
User Ops icon from the Object Palette.
• Select Add Operation command from the Flowsheet
menu, or press F12. The UnitOps property view appears.
Select User Unit Ops from the Available Unit Operations
group on the UnitOps property view.
If you use the User Ops filter on the UnitOps property view,
the left side of the property view changes to include the
same buttons that appear in the property view on Figure 6.1.
User Ops icon
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