SRtP Systems Analysis Modeller (BBSAM)
Safe Return to Port Software
Brookes Bell's System Analysis Modeller (BBSAM) analyses the availability of ship systems following damage caused by a flooding or fire incident. Based on a full inter-system dependency model, including the geographical location of components, BBSAM assesses essential ship systems for prescribed SRtP casualty scenarios (damages) and identifies critical scenarios that result in system failures.
The software outputs manual crew actions for recovery of failed systems and includes automatic reporting which forms the basis of the documentation needed to demonstrate SRtP and produce scenario specific crew manuals for use onboard. BBSAM’s output is also the first step in implementing Brookes Bell’s on board Crew Advisory Tool (BB-CAS).
Compliance with SOLAS SRtP requires that the vessel owner/operator and ultimately the crew, demonstrate that essential ship systems maintain a degree of operability for a pre-defined set of casualty scenarios (damages).
Availability of essential systems can be assessed by performing FMEA studies, however on their own, such studies are insufficient to demonstrate SRtP as casualty scenarios (damages) are not accounted for. In addition, most FMEA studies are performed during the early design stages when component locations and routing of systems (cables and pipes) are fluid, hence discrepancies may exist between the FMEA studies and the final as-built arrangement, it is often also difficult to identify and track changes in a timely and systematic manner.
BBSAM provides designers and shipbuilders with the ability to perform extensive and detailed FMEA studies, whilst accounting for the geographical location of components, routing of systems and multiple SRtP casualty scenarios. As operability can be achieved through segregation, redundancy or active recovery of affected components, the software allows alternative designs to be rapidly assessed to identify optimal system and vessel arrangements to ensure system availability and SRtP compliance.
System functionality is assessed using a ship wide dependency model, which includes the individual components of all essential systems and their required inputs and outputs (i.e. power in, flow in/out etc). The dependency model is overlaid on a geometric representation of the vessel, that includes fire and watertight boundaries so that the limits of damage and hence affected components, for any given casualty scenario, can be calculated.
As the model includes details of individual system components, it is also possible for the software to “test” whether systems can be restored for critical SRtP casualty scenarios. Through this testing, manual actions needed to restore failed systems, such as valve or switch operation, the order in which these actions need to be carried out and inter-system reliance can be identified and form the basis of crew action cards for use in an emergency.
BBSAM also includes extensive auto reporting, capable of outputting summary and detailed reports, used to demonstrate SRtP compliance and form the basis of the crew manuals and action cards needed for the vessel operating manual or muster lists.
BBSAM comprehensively validates the redundancy of complex systems to any type of scenario, including loss of multiple compartments. The software is fully customisable; capable of incorporating any vessel geometry, arrangement of onboard systems and combination of casualty scenarios. Within the BBSAM environment, the designer can efficiently assess design alternatives whilst facilitating identification of optimal ship layout and system arrangements: i.e. in line with statutory provisions and consistent with operational practices.
The software uses basic ship information, such as the general arrangement, fire plan (with MVZ), watertight subdivision, etc. in order to model vessel geometry. This is sufficient to automatically define the casualty scenarios (damages) which must be assessed for SRtP compliance.
System P&ID drawings (ideally including pipe and cable routings) or overall design philosophies are used to develop the full system dependency model so that components can be geographically positioned and systems routed around the vessel.
Assessment criteria can be customised by the user and are used to identify critical SRtP casualty scenarios. The results include information relating to the impact of failures of active components, subsystems and auxiliaries for all defined systems, such as power and propulsion, FIFI system, potable water, waste water etc. Since the dependency model details inter-system relationships down to component level, it does not rely on any assumptions to assess interactions or reliance between systems, hence manual restoring actions can be accurately defined.
Automated reporting of results can be customised to facilitate design iterations or final verification of SRtP compliance. The results can be presented and analysed system by system, by location or by casualty scenario and type of damage. The level of detail provided in the results is suitable for supporting and greatly enhances the traditional Failure Mode and Effect Analysis (FMEA) process. The BBSAM model can be used to assess and monitor compliance throughout the life of the vessel, including during planned maintenance, system modifications or upgrades. By quickly allowing re-assessment, the impact of planned maintenance or downtime on the availability or reduced effectiveness of essential systems can be ascertained; this may also include provision of revised crew actions for the duration of the planned maintenance period. Changes to existing or introducing new systems can be quickly evaluated to find the optimal arrangement, by considering the impact of alternative components, physical placement and routing of systems.
Casualty scenarios can be easily expanded to assess systems availability for more representative non-SRtP scenarios, which can greatly assist in the development of crew operating manuals, emergency contingency planning and crew training; particularly when combined with the benefits of Brookes Bell’s on board Crew Advisory Tool (BB-CAS).
- Import ship geometry; including watertight subdivision and fire zones.
- Model systems using dedicated user interface to create full systems dependency model from P&ID drawings or system design philosophy’s, depending on stage of design.
- Define system routings for cables and piping.
- Define assessment criteria for what constitutes availability of/and essential systems.
- Automatic definition of SRtP casualty scenarios (damages) with ability to modify and manually define custom scenarios.
- Use of Binary Decision Diagrams (BDD) to establish impact of casualty scenarios on components and essential systems against defined assessment criteria.
- Automatic generation of manual restoring actions where these exist for critical SRtP casualty scenarios.
- Automatic generation of summary and detailed reporting to demonstrate SRtP compliance and to produce crew emergency cards for vessel operation manuals and muster lists.
Powerful User Interface
Integrated working environment that combines and visualises watertight subdivision, arrangement of fire zones, component locations and system routings.
SQL database allows multiple users to work on the same project and incorporates detailed tracking of changes.
Assessment of physical damage, impact on system availability and definition of manual restoring actions.
Automatic report generation to document design iterations, support traditional FMEA studies or to demonstrate SRtP compliance trough statutory approval.
Flexible, Powerful Modelling
Scalable level of detail which can be adjusted to suit the level of information available during each stage of the design process. Customisable assessment criteria for system availability.
DXF used to import and update watertight subdivision and fire zones.