When Simon Storage decided to upgrade its legacy annunciator systems across four terminal sites, it chose Omniflex to provide a new SIL rated alarm system that included high-high, tank level hardwired safety critical alarms, serially derived alarm events from site-wide utilities and interfacing to existing scada based control/inventory systems.
Omniflex, working closely with P&I Design, successfully provided its distributed site-wide high level tank farm utility alarm annunciator systems on Simon Storage’s, Seal Sands, Immingham and Riverside sites.
The challenge
The existing systems were obsolete and Simon Storage needed to upgrade these to modern standards. Each site had requirements for combinations of battery backed SIL1 hardwired safety critical high-high level tank alarm/event monitoring services needed to be connected to the central control room. The layout and classification of the sites meant that a SIL rated distributed alarm system was required.
Omniflex was awarded the contract to supply distributed alarm annunciator systems using its industry proven alarm and event management technology. Combinations of local SIL1 Omni16 remote logic units (RLUs) for hardwired alarms, distributed Maxiflex I/O systems for derived alarms and OmniX high intensity LED display fascias were used to give local alarm and indication at various locations. The alarm system is independent of the basic plant control and ESD systems.
The result
The alarms system as installed is broken down into three distinctive layers:
Layer 1 – the safety critical alarms which are monitored and displayed using hardwired SIL1 Omni16 remote logic units driving local OmniX LED displays.
Layer 2 – operational alarms and events covering such systems as steam, fire and temperature are provided using Maxiflex I/O systems to multiplex alarms to serial Omni16 remote logic units again driving local OmniX displays.
Layer 3 – all alarm and event data is sent to the main scada control and inventory management systems via a multiple serial Modbus interfaces from a central Maxiflex data concentrator node.
The systems are networked over copper and fibre media. Omniflex’s solution provides Simon Storage with a long-term supportable high-integrity safety system, fully compliant with the latest regulatory requirements. The system provides reliable, clear and distinctive notification to operating staff, thereby allowing them to take timely corrective action.
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