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Local Fuel plc – Shoreham Oil Terminal
Safety Instrumented Systems – Policy and Lifecycle Activities
P & I Design Ltd
DOCUMENT NO: LF364003_RPT
2 Reed Street, Thornaby, UK, TS17 7AF
ISSUE: C DATE: 12.06.15
Tel: 00 44 (0)1642 617444
PAGE 9 OF 19
Fax: 00 44 (0)1642 616447
www.pidesign.co.uk5.6
Design and Engineering of the Safety Instrumented System
Local Fuel plc will utilise the services of suitable competent consultants, suppliers and sub-
contractors for the realisation phase of the BS EN 61511 lifecycle. The Functional Safety
Manager is responsible to ensure that all external organisations are aware of what is required
of them and he will liaise with them in providing the necessary design input and ensure that
the deliverables received by them comply with the company’s requirements.
The design shall meet the requirements of BS EN 61511 with respect to system architecture,
hardware fault tolerance, common cause failures, random hardware failures and Probability
of Failing in Demand PFD
AVG
calculations together with system capability and systematic
failures.
The design will include all necessary documentation to provide for the specification,
implementation, procurement, installation, verification testing including Factory Acceptance
Test (FAT) and Site Acceptance Tests (SAT) together with Validation documentation for
initial and on-going proof testing of the SIS.
SIL Verification calculations shall be included using failure rate data, preference in the
selection of hardware will be given to SIL Certified to BS EN 61508 components.
As shown in Figure 1, verification of the Design is required at this lifecycle phase. The
Functional Safety Manager is responsible to ensure that this verification is completed as
defined in the Safety Plan. Local Fuel plc have developed checklists to record the verification
process.
The Safety Plan will have identified if a Functional Safety Assessment (FSA) Stage 2 is to be
performed. If it is required then the Functional Safety Manager will arrange for an assessment
to be conducted.