ALE Projects delivered by DNV GL Malaysia, based in Kuala Lumpur for oil & gas sector.

1. DNV GL © 2013
 First phase of this ALE Study focuses on subsea
components, especially the jacket, with damaged leg and
pipelines to the FPSO - Conduct jacket fatigue analysis and
pipeline condition assessments, to provide recommendations
for life extensions.
 Review of topside equipment data and define the gaps based
on redefined operational requirements.
 Prepare Scope of Work document for Phase 2.
 Phase 1 delivers requirements for subsea
inspection, to allow operator ample time to
plan for underwater inspections. Results will
be reviewed and justified in Phase 2. Phase 2
will also include detailed assessments for
topside equipment.
 Phase 2 Scope of Work documents helps
customer understand expectation of work
required in next phase of the life extension
studies, to further plan and obtain budget.
The offshore wellhead platform and flowlines in the field are
approaching design life but can still produce for another 10 years.
The original design life is considered short (10 years), whilst other
assets in the field were designed for 15 years.
Customer intends to extend the operations for additional 10 years
from end of life. Platform suffers minor damage on primary jacket
leg which requires further analysis, technical review and justification.
Asset Life Extension Study (Phase 1)
Vietnam Offshore Platform
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2. DNV GL © 2013
 Structural scope:
 in-place & fatigue analysis, ultimate strength
assessments & member criticality identification.
 Development of structural RBI program for life extension.
Continual review of inspection findings & risk ranking
update.
 Equipment study:
 E&I systems, static & rotating equipment, pipelines.
 Perform risk assessment and recommend measures to
extend the life for the platforms with focus on critical
equipment
 Costing analysis (Monte Carlo)
 List of issues to address/prioritize during life
extension.
 Optimize requirements for NDT inspection for
joints to re-baseline platform life & justify
structural life extension.
 Recommended measures to extend the life
of the critical equipment.
 Recommendations for future inspection &
maintenance plans.
This platform located offshore of east Malaysia started operation in
1997 and was designed for 20 years operation (until 2017).
The customer has obtained PSC for the field until 2032, with plans to
install a new wellhead platform which will be bridge linked to this
platform. Thus is looking to operate this facility beyond intended
service life.
Platform issues are ageing or obsolete systems & equipment.
Asset Life Extension Study
Malaysian Offshore Platform
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3. DNV GL © 2013
 Proposed alternative structural life extension methodology
(API RP2SIM) by performing ultimate strength pushover
analysis - Able to prove that platforms have adequate
reliability/reserve strength despite high marine growth
thickness and inadequate fatigue life.
 Performed marine growth sensitivity to justify non-cleaning
of marine growth
 Re-baseline fatigue lives based on targeted one-off node
inspection, instead of calculated fatigue lives.
 Conducted qualitative RBI assessment to determine
platform’s inspection interval of inspection during extended
operational life.
 Minimize cost of underwater inspections and
mitigation measures required for life
extension. Large cost savings (~USD 8.5m)
based on cost comparison study
 Reduced cost of future regular inspection by
optimizing inspection interval with RBI vs
time-based inspection planning.
Fourteen (14) offshore platforms were installed between 1993 to
1998, with original design life of 20 years.
The customer intends to extend the platform service life until 2032.
A previous life extension study was performed using conventional
linear analyses, which yielded many negative results due to high
marine growth thickness and short fatigue life. Based on results, a
considerable mitigation/inspection scheme was proposed, e.g.
marine growth cleaning, underwater node weld toe grinding &
hammer peening.
Structural Alternative Life Extension Methodology
Thailand Offshore Oil & Gas field
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4. DNV GL © 2013
 To address this challenge DNV GL carried out Condition And
Remnant Life (CARL) studies for four compressor stations and one
gas terminal.
 This involved collecting all available data relating to the asset’s
integrity (inspection reports, maintenance records, performance
data, etc.) as well as carrying out a visual survey and interviewing
site maintenance and operational personnel.
 Using all the data gathered DNV GL systematically assessed the
condition of all individual systems on each asset, and their major
components, in order to identify any potential threats to the safe
and reliable ongoing operation of the asset.
 A root cause analysis was carried out on potential threats in order
to determine the most effective remedial action.
 For each asset which has been assessed the
CARL studies have delivered a comprehensive
and prioritised list of all the issues which need to
be considered when planning future
maintenance, or making strategic decisions
regarding repair, replacement and upgrade.
 The CARL studies enabled the client to quantify
the costs required to extend the remnant life of
the assets.
 In addition the studies uncovered several major
integrity issues which the client had not
previously identified as significant.
This client has a large number of gas transmission assets across the UK
which are approaching or have exceeded their original design life. They
therefore have a need to understand the condition of these ageing assets
in order to prioritise maintenance work and develop future integrity
strategies.
Although they are continually generating large quantities of data regarding
the health of their assets, including regular inspections, maintenance
reports and performance data, this data is often not fully utilised to
determine the asset condition and identify possible threats to future safe
and reliable operation.
Condition And Remnant Life (CARL) Studies
Onshore Gas Asset, UK
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5. DNV GL © 2013
 Perform a lifetime assessment study together with the Operator
and identify the technical condition of the platforms (OSA, OSB
and OSD)
 Include study of structure, process systems and utility systems,
pipelines and sub-sea installations
 Perform lifetime evaluations, identify critical issues and risks
 Perform risk assessment and recommend measures to extend the
life for the platforms with focus on critical equipment
 Updated and documented overview of the main
technical challenges
 Updated and documented risk picture related to
life extension
 Recommended measures to extend the life of the
platforms and critical equipment
 Updated economical information for input to
Business Case for life extension
 A database tool for follow up of the
recommended measures
Oseberg Feltsenter started operation in 1988 with OSA and OSB, and
extended with OSD in 2000.
After more than 20 years in operation Oseberg Feltsenter is meeting
ageing issues on the systems and equipment and some of the original
equipment is becoming obsolete.
Oseberg Feltsenter has oil and gas resources that indicate production will
continue beyond 2030, which is beyond the design life for the facilities.
Life Extension Study
Oseberg Feltsenter, North Sea
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VALUE DELIVEREDDNV GL SOLUTION
CUSTOMER CHALLENGE
PROJECT SHOWCASE

6. DNV GL © 2013
 Perform a lifetime assessment study together with the Operator
and identify the technical condition of the platforms (OSA, OSB
and OSD)
 Include study of structure, process systems and utility systems,
pipelines and sub-sea installations
 Perform lifetime evaluations, identify critical issues and risks
 Perform risk assessment and recommend measures to extend the
life for the platforms with focus on critical equipment
 Updated and documented overview of the main
technical challenges
 Updated and documented risk picture related to
life extension
 Recommended measures to extend the life of the
platforms and critical equipment
 Updated economical information for input to
Business Case for life extension
 A database tool for follow up of the
recommended measures
Oseberg Feltsenter started operation in 1988 with OSA and OSB, and
extended with OSD in 2000.
After more than 20 years in operation Oseberg Feltsenter is meeting
ageing issues on the systems and equipment and some of the original
equipment is becoming obsolete.
Oseberg Feltsenter has oil and gas resources that indicate production will
continue beyond 2030, which is beyond the design life for the facilities.
Life Extension Study
Oseberg Feltsenter, North Sea
5
VALUE DELIVEREDDNV GL SOLUTION
CUSTOMER CHALLENGE
PROJECT SHOWCASE