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BOWTIE RISK ANALYSIS
FOR
EWT FACILITIES
STUDENT INDUSTRIAL PROJECT
Name : Nur Fatin Dariah binti Mohamad Daud
Course : Chemical Engineering
Dept : HSE Department
Supervisors : Dr. Bawadi Abdullah
En. Taram Satiraksa
Strictly Confidential 1
OUTLINE
OBJECTIVES
INTRODUCTION
WHAT IS BOWTIE?
HISTORY OF BOWTIE
PROJECT METHODOLOGY
CONSTRUCTING A BOWTIE
CONCLUSION
Strictly Confidential 2
OBJECTIVES
To determine the major hazard on EWT Facilities.
To identify the threats and consequences of the Top Event
To construct Bowtie Risk Analysis of EWT facilities.
To get better understanding of process and operation in upstream operation.
Strictly Confidential 3
1. Extended well test (EWT) facilities was installed on the Floating Storage Unit (FSU) Nautica Muar for KMSE & AJK field.
2. Applying bowtie risk analysis for FSU Nautica Muar.(only focusing on EWT Facilities)
INTRODUCTION
Strictly Confidential 4
• Risk Evaluation method used to analyze and demonstrate causal relationships in
HIGH risk scenarios.
• Capture Easily in Visual
• Name from the shape of the diagram-looks like a men’s bowtie.
WHAT IS BOWTIE?
Strictly Confidential 5
HISTORY OF BOWTIE
Piper Alpha Incident 1988, 6 July
Cause by explosion
167 men died, 61 survivors
Nov 1988, Cullen Inquiry
set an investigation
Lack of understanding of hazards &
risks
Urge rose as lesson learn to
gain more understanding
and insight causality
Strictly Confidential 6
METHODOLOGICAL PARENTS OF BOWTIE1) Fault Tree Analysis
logical structure displaying therelationship between an undesiredpotential event (top event) and all itsprobable causes
2) Event Tree Analysis
identifies and quantifies the possible outcomes following an initiating event
Strictly Confidential 7
COMBINATION OF FAULT TREE AND EVENT TREE
UE 1
UE 3
UE 4
UE 5
UE 7
IE
IE
IE
IE
IE
IE
TE
SCE
SCE
DP
DP
DP
ME
ME
ME
ME
ME
ME
Fault Tree Event Tree
BarriersPrevention Mitigation
DPAnd
And
OR
OR
OR
OR
OR
UE 2
UE 6
UE 8
SCENARIO
Initiating events Major Events
Unwanted Events
Strictly Confidential 8
BARRIER THINKING - SWISS CHEESE MODEL
• Early 90’s, James Reason develop the Swiss Cheese Model.
• It is a metaphor that made barrier thinking popular for the past two decades.
• Hazards are contained by multiple protective barriers.
• Barriers are needed to prevent loss.
HAZARDINCIDENT
Barriers
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• Barriers may have weaknesses.
• Holes represent the weaknesses.
HAZARDINCIDENT
Barriers
BARRIER THINKING - SWISS CHEESE MODEL
Strictly Confidential 10
BARRIER THINKING - SWISS CHEESE MODEL
HAZARDSINCIDENT
Barriers
• Once the holes (barrier’s flaws)are aligned, Hazard will pass through the holes
in all slices leading to incident to occur./ failure.