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Simon Storage Ltd – Immingham East Terminal
Gasoline Import – Layers of Protection Analysis
P & I Design Ltd
DOCUMENT NO: SI057001_RPT
2 Reed Street, Thornaby, UK, TS17 7AF
Tel: + 44 (0)1642 617444
Fax: + 44 (0)1642 616447
www.pidesign.co.ukAPPENDIX 2
EPC Modifier
APOA Assessed
Affect
EPC Modifier
APOA Assessed
Affect
EPC Modifier
APOA Assessed
Affect
F
0.003
2
10
0.1
1.9
7
8
0.1
1.7
n/a
n/a
n/a
9.69E-03
Incorrect Routing. The
operator line-up to
selected tank and
walks the selected
route.
Restore or shift a
system to original
or new state
following
procedures with
some checking
A low signal
to noise
ratio
Low affect
due to
number of
gasoline
import
operations
No obvious
means of
reversing an
action
Low affect
due to type
of
operation.
E
0.02
31
1.2
0.8
1.16
3
10 0.2
2.8
n/a
n/a
n/a
6.50E-02
Operator Cross Check
Routine, highly
practiced, rapid
task involving
relatively low level
of skill
Low
Workforce
Moral
High Affect
taken for
terminal
personnel
and due to
generic
task
selected
A low signal
to noise
ratio
Low affect
due to type
of
operation.
F
0.003
2
10
0.1
1.9
7
8
0.1
1.7
n/a
n/a
n/a
9.69E-03
Incorrect Dip. The
surveyor dips the tank
prior to gasoline import.
Restore or shift a
system to original
or new state
following
procedures with
some checking
A low signal
to noise
ratio
Low affect
due to
number of
gasoline
dipping
operations
No obvious
means of
reversing an
action
Low affect
due to type
of
operation.
HEART ASSESSMENT
EPC 3
Resultant
Error
Probability
Manual Task
EPC 1
EPC 2
Proposed
Nominal
Human
Unreliablilty
Generic Task Type
selected