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Local Fuel plc - Shoreham Oil Terminal
Safety Instrument System Functional Safety Assessment Stage 5
P & I Design Ltd
DOCUMENT NO: LF364100_RPT
2 Reed Street, Thornaby, UK, TS17 7AF
ISSUE: A DATE: 15.06.2015
Tel: + 44 (0)1642 617444
PAGE 31 OF 32
Fax: + 44 (0)1642 616447
www.pidesign.co.uk5.11 Separate Hazards
The FSA discussed if any additional hazards were created by having the SIS. The only
identified hazard is the un-expected closure of the import valve resulting in an increased back
pressure to the ship. This is a know issue and the valve is specified to close slowly, typically
90 seconds, furthermore, a siren is provided at the jetty to inform the ship that the SIS has
activated and the valve is closing.
5.12 Other Protection Layers
Within the LOPA a number of other protection layers, mitigation layers, enabling events and
cross checks were included that were not part of the Safety Instrumented System but need to
be operated and maintained as they are fundamental to the calculated SIL of the SIS. It is
considered important that these non SIS protection layers are monitored to ensure they are
independent, effective and auditable.
Local Fuel plc confirmed that Motherwell provide maintenance and six monthly checks on
the tank gauging system. They provide full visit reports which are maintained by Local Fuel
plc.
Prior to Local Fuel plc taking over the Terminal, no drawings were available for the BPCS.
This has now been rectified and all documentation is available on site comprising of 48
drawings.