To minimize operator presence in machine and utility areas, supervision and control of the entire vessel will be performed from a central, continuously manned location.
The user-friendly AC design provides the following important features:
- Redundant ring communication network
- Stand-alone, redundant, multi-functional operator workstations
- Distributed I/O stations (with the degree of redundancy as required)
- Modular standard hardware
- On-line diagnostics
- Supervision of sensor interfaces and machinery operation
- Well proven concept
- Standard "of the shelf" hardware and software
- Reduction of cabling, due to extensive use of remote I/O
- Less hardwired mimic and console instrumentation
- Self-diagnostic features
- Reduction on spare part requirement
- One supplier, fewer interface problems
Typical Safety System
AC's personnel has been involved in delivery of several PSD, ESD, and F&G, systems using different display software, PLC manufacturers and architectures. These have ranged from simple single systems through dual redundant to special triplicated systems or a combination of these as required.
The following gives a brief overview of the principles for a AC-supplied safety system (The client may select the hardware manufacturers.)
- The design of the control system shall be based on a fail-safe philosophy.
- The operator stations shall be industrially ruggedized or marine approved MS Windows based workstations.
- Highly distributed concept, where each process sub-system may be fully controlled by a dedicated PLC as an autonomous system. Thus the sub-system could be controlled locally in case of a network or supervisory system failure.
- A fully redundant industry standard Fieldbus shall be used as the system's backbone for deterministic transfer of monitoring and control signals. This shall provide good network performance and be expandable to accommodate future modifications.Â
- Remote I/O units shall be used to optimise cabling. Fibre optic cabling may be used in areas prone to electromagnetic interference.
- The system may be serviced remotely (integrated Operations) via optic fibre cable or satellite link.
Advanced Control delivers systems according to rules of the leading classification authorities, including:
- Det norske Veritas, Lloyds Register of Shipping
- American Bureau of Shipping, Bureau Veritas
We also have broad experience of delivering systems, which meet statutory and governmental regulations, such as NPD, NVE, API, Norsok and Crine
Operator Environment (HMI)
Daily operation of the process will be from a set of MS Windows based PCs. Operator station architecture will be based on a "server/client" system. A standard Ethernet with redundancy options, shall be used for transfer of large data volumes and co-ordinating tasks between the PCs.
All information is presented via graphical screens. An Interactive 3D visualisation model of the plant is used for dynamic alarm presentation and operator interaction. Pointing and clicking buttons and objects in the screen can reach all functions of the system.
The Operator Screen has the following features:
- Safety Matrix Displays
- 2D & 3D Graphics display
- Display of Alarm & Status conditions
- Logging of Alarms and Events
Dynamic Alarm Grouping Presentation
RIVOPS is a unique technology to deal with the large amounts of alarms that can present a problem at any one time. Based on a dynamic, 3D digital presentation of the installation, the compacted alarm groups are brought to the attention of the operators.
Alarms are grouped according to historical patterns and HAZOP studies. When an alarm pattern is detected, grouping features are activated. The result is a significant drop of the alarm rate, increasing the operator awareness.
Safety System References
AC’s personnel have been involved in delivery of several Systems using different display software, PLC manufacturers and architectures. Our Automation product range comprises:
- Fire and Gas Detection (F&G)
- Shutdown (PSD)
- Emergency Shutdown (ESD)
- High Integrity Protection Systems (HIPS)