Requirement Analysis Process
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The diagram shows the main activities for developing the detailed functional requirements. It is oriented around the  S88 physical and procedural models.

S88.01 defines these models generically - that is to say that the models are universal and apply to any plant. The analysis process must take these generic models and then apply them to the particular plant. For example the physical model in S88 shows Control Modules.  The requirements analysis should identify what are the actual modules required by the particular plant, ideally by producing a Functional Requirements Model.

There are pre-requisites before the detailed analysis can be done. 

Piping & Instrument Diagrams:

Usually available before the analysis is done

If not available, the requirements analysis has the opportunity to document or even influence the basic design process

Control & Operability Philosophy:

This should contain the general principles that the end user will want to apply to the project. It should define the level of automation that is required, the information handing needs and the operational requirements. 


Process Descriptions

These are typically written by a process engineer, often without reference to S88

Useful starting point for the analysis

They may be superseded by the document that is generated as a result of the requirements analysis

Equipment Protection Requirements

This is typically provided by mechanical equipment suppliers needs.

Describe the Physical Model

This involves finding and describing the entities in the physical model, specifically the Process Cells, Units, Common Resources, Equipment modules and control modules

Describe the Procedural Model

This involves finding and describing the entities in the Procedural model, specifically the Recipes, Operations, and Phases 

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