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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 20 OF 23
Fax: + 44 (0)1642 616447
www.pidesign.co.ukP & I Design Ltd
PFD - Sensor Subsystem Calculation Sheet 1
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
2
2
Failure Rate/hr (λ)
Failure Rate/hr (λ)
Level Sw itch
0.00E+00
λSD
3.50E-08
3.00E-07
λSU
9.00E-01
6.86E-07
λDD
8.40E+01
7.30E-08
λDU
2.50E-08
1.06E-06
8.49E+01
0.93
1.00
7.59E-07
8.40E+01
90.38
100.00
SUB-SYSTEM DATA
24
365
0.0
93
25.0
7.59E-07
6.86E-07
7.30E-08
0
445.3
n/a
90.4
3.38E-04
8.57E-04
Valid
116
B
YES
Device Type
Fault Tolerance Check (BS61508 - 2:2010) has been met?
Drexelbrook RF Type
LF364
Local Fuel
Shoreham Terminal
LF364101_CAL
Total Failures (λ)
System Architecture
Sub System Item
Failures - Safe, Detected (λSD)
Failures - Safe, Undetected (λSU)
Failures - Dangerous, Detected (λDD)
Operational Lifetime of SIF (LT) - years
LFS-SIS1
FAULT TOLERANCE CHECK
Fraction of undetected failures that have a common cause (β)
Channel Downtime (t
CE
)
Voted Group Downtime (t
GE
)
Mean Diagnostic Coverage
LOOP CRITERIA ACHIEVED
PFD Total (Perfect Testing)
FAILURE DATA
PFD Total (Imperfect Testing)
Failures - Dangerous, Undetected (λDU)
SIL achieved (Including Fault Tolerance)
Spurious Trip Rate (years)
FAILURE CALCULATIONS
Total System Dangerous Undetected Failure (λ
DU(group)
)
Safe Fail Fraction
Total Dangerous Failures (λ
D
)
Calculated Diagnostic Coverage (%)
Mean Time to Repair (hrs)
Proof Test Interval (days)
Percent of detected failures that have common cause (βD)
Proof Test Coverage (C
PT) -
%
CALCULATED DATA
Total System Dangerous Failure (λ
D(group)
)
Total System Dangerous Detected Failure (λ
DD(group)
)