chris wicks
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The QuickLists
Christopher Wicks
UK HES Manager
Marathon Oil U.K. LLC
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Overview
What are QuickLists?
What do they do for us?
How are they used?
Summary
Marathon Oil U.K. LLC
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What Are QuickLists?
Principally
Emergency response and incident management
–Aid the on-site emergency team in:
• Assessing the hazard
• Understanding escalation potential
–Provide guidance and reminders on potential access / egress impairment
issues
Additionally
Reference tool for Operations personnel
Supporting development of Emergency Response Exercises
Communication tool summarising Major Accident Events for
workforce
Marathon Oil U.K. LLC
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Background
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Background
QRA – Quantified Risk Assessment
Statistical analysis to evaluate the risk to the individuals on the
plant
Complex
Costly
Under used?
What value does it add?
Marathon Oil U.K. LLC
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Typical QRA Output…
4.2 x 10-4
One number that defines the risk to an individualDoes this help make anybody safer?
Data presented for example only
Marathon Oil U.K. LLC
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Value of QRA?
A
4.2 x 10-4B
9.8 x 10-4
7.2 x 10-4
6.8 x 10-4
Change design to
remove leak sources
Add rated
fire/blast walls
Optimise fire/gas
detection system
Marathon Oil U.K. LLC
Data presented for example only
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Journey Findings/Outcomes
Marathon Oil U.K. LLC
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Example
Marathon Oil U.K. LLC
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Escalation from Fires
3 0 M i n u t e s
5% Chance Wall Fails
F i r e
Process Area ‘Safe’ Area
Marathon Oil U.K. LLC
Data presented for example only
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0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0 20 40 60 80 100 120 140 160 180
P r o b a b
i l i t y
( D u r a t i o n l o n
g e r t h a n )
Duration of event (minutes)
Event Escalation
Marathon Oil U.K. LLC
Data presented for example only
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Example
Marathon Oil U.K. LLC
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Escalation from Explosions
0 . 5
B a r g
20% Chance Wall Fails
E x p l o s i o n
Process Area ‘Safe’ Area
Marathon Oil U.K. LLC
Data presented for example only
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0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.0 0.5 1.0 1.5 2.0 2.5 3.0
P r o b
a b i l i t y
( O v e r p r e s s u r e g r e a t e r t h a n )
Overpressure (bar)
Event Escalation
Marathon Oil U.K. LLC
Data presented for example only
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Example
Marathon Oil U.K. LLC
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Wind
Gas Concentration
Wind speed and direction displaces
different volumes of air resulting in
varying air change rates
Marathon Oil U.K. LLC
Open Modules
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Wind
Wind speed and direction displaces
different volumes of air resulting in
varying air change rates
Gas Concentration
Marathon Oil U.K. LLC
Open Modules
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Gas Concentration
Wind Speed 5 knots
10 knots
>15 knots
120
300
160 170
180 190
200
210
220
230
240
250
260
270
280
290
310
320
330
340 350
0 10
20
30
40
50
60
70
80
90
100
110
130
140
150
160 170
180 190
200
210
220
230
240
250
260
270
280
290
310
320
330
340 350
2015
105
Duration to
Concentration <20%LEL (mins)
Marathon Oil U.K. LLC
Data presented for example only
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Gas Concentration
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0 5 10 15 20 25 30
P r o b a b
i l i t y
( F l a m m a b l e G a s C l o
u d S t i l l P r e s e n t )
Time (Minutes)
A
B
Marathon Oil U.K. LLC
Data presented for example only
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One Tool…
Marathon Oil U.K. LLC
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Graphical Interpretation
Given QuickLists are to be used in
potentially stressful situations they must
be:
Simple to read
Clear and concise
Interpretable with limited ‘experience’
Comprehensive enough to meet the needs ofthe event
Marathon Oil U.K. LLC
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Layout Overview – Process Hazards
Escalation
Potential
BlowdownCurves
Gas Detection
Layout and
Inventory
Volumes
Fire Detection
layout and
Module
Boundary Data
Marathon Oil U.K. LLC
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Escalation Potential Example – Open Module
1. Select Table A, B or C based on prevailing weather conditions
2. If all critical safety systems (blowdown, isolation etc.) are functioning asexpected, estimate of duration until gas cloud dissipated
Example Wind from 175 degrees at 7 knots – use Table A
All SCEs OK, use 1st column
61% chance gas will be dissipated within the hour, but 39% (i.e. reasonablechance) that it will still be there, certainly in pockets
Marathon Oil U.K. LLC
Data presented for example only
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Escalation Potential Example – Fire
1. If SCE fails (Blowdown, Isolation), high chance of event lasting longer than 1 hour
Possible structural damage and flare boom impact
North end of asset not assessable
Be aware of prevailing weather – combustion products could impair helideck
Marathon Oil U.K. LLC
Data presented for example only
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Blowdown Curves
Blowdown Valve Failed to Open
Blowdown Slower than Expected - Partially Opened Valve?
Blowdown Quicker than Expected - Release from Inventory?
Expected Blowdown
Marathon Oil U.K. LLC
Data presented for example only
O h MAE /I f i I l d d
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Other MAEs/Information Included
Data presented for other Major
Accident Events, including:
Ship Collision
Riser Events
Oil Spills and Response
Chemical Spills
Riser Releases
Ship Collision
Marathon Oil U.K. LLC
S
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Summary
Provide a simple guide to incident control team
members (on- and offshore), enabling them to: Identify potential escalation issues
Identify access/egress considerations
Evaluate event severity, likely duration and possible control
measures
Additionally
Provides reference tool for onshore teams
Supporting development of Emergency Response ExercisesCommunication tool summarising MAEs for workforce
Marathon Oil U.K. LLC
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Thankyou
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