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Local Fuel PLC –The Shoreham Oil Terminal
Safety Instrument System LFS-SIS1 - Operation, Maintenance and Modification Lifecycle
P & I Design Ltd
DOCUMENT NO: LF364013_RPT
2 Reed Street, Thornaby, UK, TS17 7AF
ISSUE: B DATE: 16.05.16
Tel: + 44 (0)1642 617444
PAGE 7 OF 11
Fax: + 44 (0)1642 616447
www.pidesign.co.ukconditions during proof testing must be accounted for within the safety integrity assessment
of the SIS.
It is not considered that testing of the level switches by raising the levels in the tanks will be
routinely carried out. It is recommended however, that during hydrostatic testing or
insurance inspections on each tank, the water level be taken up to and beyond the high level
switch to prove operation of the switch in-situ. This test to be documented in accordance
with the testing procedures.
5.1.1 Document Verification
Document Verification – Check of documentation to verify correct documentation used for
testing and identify modifications to the system since last testing phase.
5.1.2 Hardware Verification
Hardware Verification – Check to verify no unauthorised modifications have been carried
out and verify physical condition and fitness for purpose.
5.1.3 Shutdown Conditions Proof Testing
Shutdown Conditions Functional Proof Testing – Functional test of the system whist the
process is not active, e.g no flow through final element valves, process not taken to trip
point. Test switches and /or process simulation used to complete test, this is a partial test
only and may not reveal all undetected faults. System diagnostics and known safe failures
are tested at this phase.
The Sensing Element Liquiphant’s are tested by using the Test button facility of the
Nivotester unit as per the manufacturers recommendations. A full wet test is carried out
periodically as detailed in section 8.
5.1.4 Process Conditions Proof Testing
Process Conditions Functional Proof Testing – Functional test of the SIS whilst the process
is active. E.g Final elements closed against process flow / Process is allowed to reach the trip
point activating final elements to bring the process to a safe state.
5.2
Preventative Maintenance
Preventative Maintenance required to keep the hardware operational and satisfy regulations.
No specific preventative maintenance activities identified.
Regulations - ATEX electrical inspections to be carried out in line with the Facility’s
schedule.
5.3
Functional Safety Meetings / Reviews / Faults and Activations
A review should be carried following any genuine activation, serious trip or on detection of
a system fault.
5.4
Stage 4 Operation and Maintenance Functional Safety Assessment
Stage 4 Operation and Maintenance - Function Safety Assessments to carry out as
scheduled.