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Local Fuel PLC – The Shoreham Oil Terminal
Safety Instrument System Overfill Shutdown Conditions Proof Testing Procedure LFS-SIS1
P & I Design Ltd
DOCUMENT NO: LF364012_RPT
2 Reed Street, Thornaby, UK, TS17 7AF
ISSUE: A DATE: 20.05.15
Tel: + 44 (0)1642 617444
PAGE 13 OF 22
Fax: + 44 (0)1642 616447
www.pidesign.co.uk7.3
Drexelbrook Sensor As Found Physical Test Functional Testing
Physical testing of Drexelbrook sensors required minimum of every 8 years.
Refer to LF364004_SCH - LFS-SIS1 Testing Lifecycle Matrix for scheduling.
Purpose of Test
To verify the SIF operates correctly under simulated process conditions.
SIF is SENSOR ELEMENT trips & inhibits the FINAL ELEMENT(s) to the safe state as specified.
Method of activation is by physically removing the sensor element.
To verify the correct DIAGNOSTICS information.
If sensing element defective the tank could overfill if a demand is made on the overfill protection
system.
If response target time is exceeded the tank could overfill following demand.
Diagnostic information not displayed correctly could result in undetected tank overfill, system
unavailability or incorrect operational response.
If a physical test not carried out every 8 years the PDF of the system will fall outside of the defined
SIL.
Controlled Copy Documentation Required
LF364003_SCH - LFS-SIS1 Testing Matrix
Record results on LF364003_SCH Sheets 2 & 4.
Step
Method of Test
Acceptance Criteria
Pass (
)
Fail (x)
Initial
7.3.1
Review procedure with operations and
testing personnel.
All personnel familiarised with the
scope of works and responsibilities
.
Comment any issues in section 7.3.8 and
review / rectify prior to starting testing.
7.3.2
Confirm plant preparations satisfactory
prior to each period of work and
following changes in plant conditions
or operations.
Record PTW No………………………….
Conditions satisfied as detailed on PTW
and RAMS.
Comment any issues in section 7.3.8 and
review / rectify prior to starting any site
work.
7.3.3
Confirm system healthy and reset by
comparing against information on
LF364003_SCH Sheet 1
System reset as detailed on
LF364003_SCH Sheet 1.
Comment differences from SCH or if
found in tripped state in section 7.3.8.
7.3.4
Confirm all final element valves
tripped by the initiator under test are
open.
Correct FINAL ELEMENT valve
position and DIAGNOSTICS as detailed
on LF364003_SCH Sheet 2.
Comment differences from SCH in
section 7.3.8.
Drexelbrook Sensor As Found Physical Test Functional Testing Continued on page 14