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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 11 OF 32
Fax: + 44 (0)1642 616447
www.pidesign.co.ukchange over be required until the SIL rated actuator is returned to service. This should produce
a MTTR in accordance with the SIL verification of within 24 hours.
b). Current company strategy is diversity in the Terminal and as the quantities of gasoline
have reduced the extra storage capacity will be utilised for Marine Gas oil because recent
legislation has increased the demand for MGO in the location.
4.6
Hazards Which May Be Affected By The Modification
No change in the hazard perceived.
a). The Rotork actuator should perform identically to the existing installed device. However,
there may be subtle differences within the actuators firmware and as such the complete system
is to be proof tested following completion of the installation.
The sensors and logic solver are as original for Tanks 1, 2, 3 & 4 gasoline tanks.
Distillate tanks 5, 6, 7, 8, 9, 10, 11, 18. 18A, 21 & 22 utilise RF technology sensors but are
alarm only.
b). The change of Tank duty will reduce the terminals current capacity for the storage of
gasoline from four to two tanks. This was addressed in the LOPA report LF364002_RPT.
4.7
The Impact On Functional Safety
a). As this is a change of actuator it is essential that it performs as specified. Checks must be
completed to ensure that systematic failures are not induced through the design phase, and
manufacturing phases, including:
o
Ensure sufficient oversizing and torque to close against ships pumps
o
Ensure slow closing not to induce pressure surge issues in import line
o
Confirm failures mode operation including loss of power
b). No impact on functional safety is perceived from the reduction in gasoline storage.
4.8
Approvals For The Modification and Competencies
For the modification, Local Fuel MOC’s will be completed and this FSA Stage 5 will be
conducted to ensure compliance to functional safety and to BS EN 61511 lifecycle.
4.9
Timescale and Timelines
a). At the FSA meeting it was advised that the Rotork is on a long delivery. However, design
has commenced with the Safety Requirement Specification having been updated.
The documentation has been revised with the references to Chevron/Valero being removed
and creating new issue drawings for Local Fuel plc. These drawings at Revision A will be
reviewed by this FSA. It may become necessary to revise them further for the modifications.