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Local Fuel – The Shoreham Oil Terminal
Gasoline Import - Safety Instrument System
P & I Design Ltd
DOCUMENT NO: LF364006_RPT
2 Reed Street, Thornaby, UK, TS17 7AF
ISSUE: C DATE: 13.05.16
Tel: + 44 (0)1642 617444
PAGE 22 OF 23
Fax: + 44 (0)1642 616447
www.pidesign.co.ukP & I Design Ltd
PFD - Logic Solver Subsystem Calculation Sheet 2
www.pidesign.co.ukSheet Title:-
Version 5.8
Project:
Originator:
DSR
Client:
Checked:
DBF
Client Ref:
Approved:
DSR
Document:
Issue:
B
SIS Number:
Date:
09.05.16
Key:
Data Input Cell
Calculation Cell
Results Cell
Element 1
Element 2
Data Type
Data Type
2
3
2
Failure Rate/hr (λ)
PFD Value Certified
Trip Amplifier
9.00E-09
PFD Value
3.50E-08
3.47E-07
SFF ( 0 to 1.0 )
0.90
8.90E-08
Diagnostic Coverage (%)
84.00
9.00E-08
2.50E-08
5.35E-07
1.30E-10
0.83
0.90
1.79E-07
5.79E-11
49.72
84.00
SUB-SYSTEM DATA
24
365
0.0
100
25.0
1.79E-07
8.90E-08
9.00E-08
0
2226.2
n/a
49.7
3.98E-04
3.94E-04
Valid
257
B
NO
Failures - Dangerous, Detected (λDD)
P&F - KFD2-CRG-Ex1.D
LF364
Local Fuel
Shoreham Terminal
LF364101_CAL
LFS-SIS1
System Architecture
Sub System Item
FAILURE DATA
Failures - Safe, Detected (λSD)
Failures - Safe, Undetected (λSU)
Proof Test Interval (days)
Failures - Dangerous, Undetected (λDU)
FAILURE CALCULATIONS
Total Failures (λ)
Safe Fail Fraction
Total Dangerous Failures (λ
D
)
Calculated Diagnostic Coverage (%)
Mean Time to Repair (hrs)
LOOP CRITERIA ACHIEVED
Percent of detected failures that have common cause (βD)
Proof Test Coverage (C
PT) -
%
Operational Lifetime of SIF (LT) - years
CALCULATED DATA
Total System Dangerous Failure (λ
D(group)
)
Total System Dangerous Detected Failure (λ
DD(group)
)
Total System Dangerous Undetected Failure (λ
DU(group)
)
Fraction of undetected failures that have a common cause (β)
Channel Downtime (t
CE
)
Voted Group Downtime (t
GE
)
Mean Diagnostic Coverage
Fault Tolerance Check (BS61508 - 2:2010) has been met?
PFD Total (Perfect Testing)
PFD Total (Imperfect Testing)
SIL achieved (Including Fault Tolerance)
Spurious Trip Rate (years)
FAULT TOLERANCE CHECK
Device Type
Note Hardware Fault Tolerance Check not made - Type B components with a SFF of 60 to
<90% must have a hardware fault tolerance of 1 according to table 3 for SIL2 subsystems.
Thus a single device is not normally appropriate against this criteria. However the
manufacture has provided prior and proven in use assessments performed by Exida, which
confirm the device complies with the requirements of BSEN 61511 and can be used as a
single device in a SIL 2 application.