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TRANSCRIPT
Major Hazard Management C-NLOPB Safety Forum – April 27-28, 2016
Major Hazard Management
Safety
Case
Major Hazard Identification
Major Hazard Risk
Assessment
Major Hazard Barriers
Barrier Management
Major Hazards …something that can cause a
major accident i.e.
• Multiple (5 or more) serious
injuries or fatalities
• Major damage to the rig or
environment
• Loss of the rig
The focus is not occupational /
personal safety
Major Hazards: Semi-sub
1. Hydrocarbons
a) Shallow gas
b) Hydrocarbons in formation during well operations
c) Hydrocarbons in formation during coiled tubing / wireline operations
d) Hydrocarbons in subsea assets
e) Hydrocarbons during well testing
f) Gas cut mud
2. Flammable / Combustible
Materials
7. Hydrogen Sulfide (H2S)
3. Explosives 8. Vessel Stability
4. Suspended Loads 9. Watertight Integrity
5. Station Keeping 10. Rig Moving
6. Helicopter
Major Accident Hazard Risk
Assessment (MAHRA)
• Two-day MAHRA workshop
• Formal Bowtie review
• One for each Major Hazard
• Confirms the hazards and
the identified barriers in
place to prevent or mitigate
• Risk assessment of the
major accident scenarios
assuming effective barriers
in place
Bowtie Diagrams
The Major Hazard is something
that can cause a major accident
e.g. Flammable Materials
Bowtie Diagrams
The Top Event is the initial loss
of control e.g. Fire
Bowtie Diagrams
Threats can cause the initial loss
of control e.g. Hot Work
Bowtie Diagrams
Preventative Barriers reduce the
likelihood that a loss of control will occur
e.g. Designated Hot Work Area
Bowtie Diagrams
The Consequences describe the
outcome if the loss of control escalates
e.g. asset damage
Bowtie Diagrams
Mitigating Barriers prevent escalation and
reduce the severity of the Consequence
e.g. Fire Detection System
Bowtie Diagrams
Barrier Escalation Factors can cause a
barrier to fail. They are supported by
their own barriers
Example Bowtie
Example Bowtie
• When ‘expanded’ they are much larger
Major Hazard Barriers
People
Plant
Process
Safety Critical Activities
People
Plant Process
Activity Activity
Activity
A Safety Critical Activity is …
… an activity that ensures that major hazard
barriers are implemented, monitored, tested and
verified
Something important done to support a major
hazard barrier
SCA Matrix & Worksheets
SCA Matrix
Job Position Worksheets
Preventative Barrier Doc. Ref.
Rig Move Procedure
planning6
Execution of Rig Move
Procedure6
Rig provided satellite
navigation equipment5
Bowtie 1a: Reservoir Hydrocarbons: Shallow Gas
Threat: Rig positioned incorrectly
Safety Critical Activities
Provide input to the planning of Rig Move Procedure
Ensure Rig Move Procedures are followed
Ensure the system is maintained as per RMS
Barge Supervisor Responsibilities
Overview
A Safety Critical Activity (SCA) is an activity for ensuring that major hazard barrier(s) are implemented, monitored,
tested or verified.
The following are the SCAs that the Barge Supervisor is responsible for.
Reference Document(s)
Marine Compliance Procedures (1)
Emergency Management Procedures (2)
World-wide Training Matrix (3)
Rig-specific Emergency Response Plan (4)
RMS (5)
Specific Rig Move Procedure (6)
Rig-specific Marine Operations Manual (7)
Environmental Policies and Requirements (8)
Health and Safety Policies and Requirements (9)
Mid-water and Harsh Environment Field Operations (10)
HSE Case
Health, Safety and
Environmental (HSE) Case
• Documents the management
of HSE risk on the rig
• Summarizes the MAHRA
process
• Communicates the key barriers
in place to manage major
hazards
• Including the Safety
Critical Activities
QUESTIONS?