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Immingham East Terminal – Gasoline Overfill Protection
Safety Instrument System
P & I Design Ltd
DOCUMENT NO: SI277001_RPT
2 Reed Street, Thornaby, UK, TS17 7AF
ISSUE:
F
DATE: 31.10.14
Tel: + 44 (0)1642 617444
PAGE 26 OF 29
Fax: + 44 (0)1642 616447
www.pidesign.co.ukP & I Design Ltd
Logic Solver Calculation Sheet 1
www.pidesign.co.ukSheet Title:-
Version 5.6
Project:
Originator:
PP
Client:
Checked:
DRR
Client Ref:
Approved:
DRR
Document:
Issue:
C
SIS Number:
Date:
24/02/2011
Key:
Data Input Cell
Calculation Cell
Results Cell
Data Type
3
3
3
2
PFD Value Certified
PFD Value Certified PDF Value Certified
Safety Relay
XA-002
Item 1
FAILURE DATA
2.50E-07
1.25E-07
1.25E-07
2.50E-07
1.25E-07
1.25E-07
0.00E+00
1.50E-07
1.75E-07
5.00E-07
1.00E-07
7.50E-08
3.00E+03
3.00E+03
3.00E+03
0.95
0.95
0.95
0.95
25.00
25.00
4.00E-06
4.00E-06
4.00E-06
FAILURE CALCULATIONS
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
SUB-SYSTEM DATA
8
12
15.0
n/a
n/a
n/a
n/a
n/a
n/a
n/a
4.00E-06
Valid
13158
FAULT TOLERANCE CHECK
2
Programmable
3 Conforms to Note 1
1
Safety Relay PNOZ S2
LOOP CRITERIA ACHIEVED
PFD Total
MTBF all failure modes (hours)
Safe split fraction ( 0 to 1.0 )
Failures - Safe, Detected (λSD)
Failures - Safe, Undetected (λSU)
Immingham East
Simon Storage
Total System Dangerous Failure (λ
D(group)
)
No.4 East Tanks
SI277001.CAL
System Architecture
Sub System Item
Safe Fail Fraction
PFD Value (From Certificate)
Total Failures (λ)
Voted Group Downtime (t
GE
)
Mean Diagnostic Coverage
CALCULATED DATA
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)
Fraction of detected failures that have common cause (βD)
SIL achieved (Including Fault Tolerance)
Failures - Dangerous, Detected (λDD)
Failures - Dangerous, Undetected (λDU)
4. system function has SIL requirement of <4
Diagnostic Coverage
Non Programmable
Note 1: In order to reduce the fault tolerance by 1, for sensors,
final elements and non-programmable logic solvers, the
following must be satisfied:
1. the hardware is selected on the basis of proven technology
(prior use)
2. adjustment, of process related parameters only, allowed to
the user.
Channel Downtime (t
CE
)
Total Dangerous Failures (λ
D
)
Calculated Diagnostic Coverage
Mean Time to Repair
Proof Test Interval (days)
3. adjustment, of process related parameters, is protected by
password or removeable programming link.
Spurious Trip Rate (years)