System Design Features

Membrane System Design Features For the rate process of permeation to occur, there must be a driving force. For gas separations, that force is partial pressure (or fugacity). Since the ratio of the component fluxes determines the separation, the partial pressure of each component at each point is important. There are three ways of driving the process Either high partial pressure on the feed side (achieved by high total pressure), or low partial pressure on the permeate side, which may be achieved either by vacuum or by introduc-... 

The link in SC.3 to 2,30 points to the level 2 system design feature that implements this safety constraint. The other links provide traceability to the hazard (H6) from which the constraint was derived and to the parts of the hazard analysis involved, in this case the part of the hazard analysis labeled HA-550. 

Once the system design features are determined, (1) an internal control structure for the system itself is constructed along with the interfaces between the components and (2) functional requirements and design constraints, derived from the system-level requirements and constraints, are allocated to the individual system... 

At this point in development, the safety requirements and constraints are documented and traced to the design features used to implement them. A hazard log contains the hazard information (or links to it) generated during the development process and the results of the hazard analysis performed. The log will contain embedded links to the resolution of each hazard, such as functional requirements, design constraints, system design features, operational procedures, and system limitations. The information documented should be easy to collect into a form that can be used for the final safety assessment and certification of the system. 

Safety specifications—documents the equipment/system design features, performance specifications, and training that reduces the potential for human or machine errors or failures that cause injury or death within the constraints of operational effectiveness, time, and cost throughout the equipment/system life cycle. 

Design Basis Accidents Systems/Design features Passive/active Remarks... 

Provisions measures implemented in design and operation such as inherent plant characteristics, safety margins, system design features and operational measures contributing to the performance of the safety functions aimed at preventing the mechanisms from occurring. 

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