Document

©2015 American Bureau of Shipping. All rights reserved.
Title of Powerpoint
Subhead
Operational Safety:
Tools for Incident Prevention
Date of Event
Location of Event
Name of Presenter
Title of Presenter, Company
Operational Safety
• Operational safety
involves effort and
expense
• Trend these days
among ABS clients:
• Getting tools for
incident prevention is
– “The Right Thing To Do”
– “Simply Good Business”
2
Examples of Tools to Reduce Incidents
• Jackup rig moves
– Methodology to define
operational limits
– Systems to monitor
motions and seastates
• DP systems and
operations
– ABS DP Guide
• MODU hull condition
management
– Process for systematic
inspection and
maintenance
3
Present Practice: Jackup Rig Moves
• Jackups are prone to damage during rig moves
• Overly-conservative approach
– Waiting on weather
– Non-productive time (NPT), lost revenue – CERTAIN
• Overly-aggressive approach
– Rolling the dice, downside
is incident with unplanned
repair project
– Costly repairs
– NPT, lost revenue
4
Present Practice: Operational Limits
• Documented in rig’s Marine
Operating Manual
• Limits are based on seastate
• Largely experience-based
• Typically don’t account for:
–
–
–
–
Wave period
Wave direction
Swell
Other effects
5
Updated Practice: Methodology & Monitoring
• Moving off location:
– Get allowable limits. Analyze potential for damaging legs
and pinions during leg extraction.
– Monitor seastates while elevated, get statistics
– Use statistics vs limits for go/no-go decision
• Moving on location:
– Get allowable limits. Analyze potential for damaging legs
and pinions during touchdown on seabed.
– Monitor hull motions during approach, get statistics
– Use statistics versus limits for go/no-go decision
• ABS Guide / Guidance Notes under development
6
DP Drillships: Challenges of Expanding Fleet
• Pre–1995: 23 drillships exist – a few experts dealing with a few rigs
• 2015 and beyond: 170 drillships – not enough experts to go around
# of Drillships vs. Build Date (as of 4Q/14)
80
70
60
50
40
30
20
10
0
pre 1969
1970 1974-
1975 1979
1980 1984
1985 1989
1990 1994
1995 1999
2000 2004
2005 2009
2009 2014
2015-'19
So Far
7
DP Drillships: Risk Management Challenge
• Loss of station with
emergency disconnect of
riser:
– Safety
– Environmental event
– Costly downtime
• Who is controlling the risk?
– Operator A
– Contractor B
• Who owns the risk? All
industry stakeholders.
8
DP Drillships: Results of Standardization
• DP knowledge now resides in industry standards (e.g.,
ABS Guide for Dynamic Positioning Systems)
• Best practices for DP operations are available to all
stakeholders (ISO 13624-1, ISO 13624-2, API 16Q)
– Drift-off analysis techniques
– Watch circles in DP operations
– Emergency disconnect
sequences
– Riser recoil
– Drilling riser management
• This approach is:
– “The right thing to do”
– “Simply good business”
9
MODU Hull Condition Management: Ageing Fleet
• 50% of MODUs are over 30 years old (dominated by SEDUs)
# of MODUs vs. Build Dates
(Q4/14)
200
180
Drillships
CSDU
SEDU
160
140
120
100
80
60
40
20
0
pre - 1969
1970 1974-
1975 1979
1980 1984
1985 1989
1990 1994
1995 1999
2000 2004
2005 2009
2009 2014
10
MODU Hull Condition Management: Issues
• Safety and operational efficiency challenges:
– Safety issues (e.g., watertight integrity, structural failures)
– Cost of repairs; NPT; Time in repair yards
– Remaining life
• Inspection and maintenance
– Vital to the safe operation and longevity
– Time-consuming, difficult and expensive
• Preparation for periodic surveys
– Conducted on location – avoids lost revenue; avoids cost
of moving vessel to dry dock
11
MODU Hull Condition Management: Solution
• Systematic hull inspection and maintenance
• Employs the following tools:
–
–
–
–
Survey planning document
Computerized planning and inspection tools
Acceptance criteria
An eye toward repair and dry dock planning
• Minimizes chance of hull failures and reduces
costly repairs and NPT over the life of the vessel
• Inspection software used by on-board personnel
12
Operational Safety: Summary
• Operational safety involves effort and expense
• Tools for incident prevention are available
• Putting them to work is:
– “The Right Thing To Do”
– “Simply Good Business”
13
©2015 American Bureau of Shipping. All rights reserved.
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