HDS Plant CGU-Level Model Representation within UML

HDS plant model is represented using UML in a hierarchical manner. In the top-level of abstraction the plant is considered as a master CGU, which is represented within UML as a package with inputs (Diesel and H2) and outputs (Gas-off, Sulfur-free Diesel, and Naftha). The inputs 

Fld-Flw-0-1 represents the fluid flow in level (0) from the class Source Diesel to the CGU (Cl). Both are referring to the same metaclass with the same properties, although they are in two different levels of abstraction. As a systematic approach, the abstraction level has been used as a part of the naming convention of the fluid flows. Each fluid flow in any level is associated with the following information (1) Signal , which is a specification of a asynchronous stimulus between objects and is processed by the StateMachines, (2) Destination element , which indicates the destination of the fluid flow, and (3) Metaclass , which links the fluid flow to a given fluid class (defined within the metamodel level). 

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Figure 9-2 HDS Plant CGU-Level Model Representation within UML...

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