integrity management of pipelines and risers. 2011/rørledningssemina… · pipeline & riser...
TRANSCRIPT
Bente H Leinum and Øyvin Eriksen
Integrity Management of Pipelines and Risers.
How to ensure integrity from well to shore?
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Integrity Management of Pipelines and Risers.
Pipeline & Riser – System Thinking
2 2 Slide 2
Systems thinking is the process of
understanding how things influence
one another within a whole
from well to shore
from concept to
operation
from internal flow to
external threats
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Integrity Management of Pipelines and Risers.
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DNV RP-F116 definition of Pipeline System Integrity
The function of submarine pipeline systems is to efficiently and safely
transport a variety of fluids
‘Pipeline system integrity’ is defined as the pipeline system’s
structural/containment function.
There are two main failure modes;
1. Loss of containment – leakage or full bore rupture
2. Gross deformation of the pipe cross section resulting
in either reduced static strength or fatigue strength.
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Integrity Management of Pipelines and Risers.
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Integrity Management in the Operational Phase System Thinking
Flow Integrity Structural Integrity
Functional Integrity Production Integrity
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Overall framework for the IM-process
Management Processes
Support Processes
Core processes
- Administration (information management, doc control)
- Reporting & Communication - HR (people, competence & training) - Project Management - Contractors & Purchasing - Emergency Preparedness - Learning from Events - Management of Change - Incident Reporting
- Policy & Strategy - Safety Philosophy - Leadership Commitment - Regulatory & Other Requirements
(Compliance) - Planning - External Communications - Audits - Results and Review - Risk Management - Interface Management
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Integrity Management of Pipelines and Risers.
System Overview –
From Design during Operation
6
Control systems
e.g.
Equipment
Pipelines
Risers
DFI
Sub-system Approach
Op
era
tion R
ea
din
ess - H
an
do
ve
r
Commissioning & Operation
System Approach
Projects
Operation unit
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IM-Process in a life cycle perspective
The integrity is
Established during the concept, design and construction
phases
Maintained in the operations phase
Transferred from the development phase to the operations
phase. This interface involves transfer of vital data and
information about the system.
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Planned development:
Complete Integrity Management (IM) Codes
Management system
DNV-RP-Fxxx
Pipeline
DNV-RP-F116
Risers
DNV-RP-F206
Subsea
DNV-RP-Fxxx
Technical guidelines - DNV recommended practices (RP)
Well
DNV-RP-Fxxx
Harmonized risk philosophy and documents
Both high level and detailed technical guidelines
Flow
DNV-RP-Fxxx
Flexible
DNV-RP-Fxxx
Technical requirements – DNV standards (OS) and ISO
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Risk assessment and knowing the threat picture
General industry practice a risk based approach should be applied
Identify and manage threats
- combined effect of threats
- changes in threat picture.
Examples: Anchor
18 %
Impact
24 %
Corrosion
27 %
Structural
5 %
Material
10 %
Other
11 %
Nat. Hazard
5 %
Anchor
6 %
Impact
7 %
Corrosion
40 %
Structural
8 %
Material
4 %
Other
18 %Nat. Hazard
17 %
The Gulf of Mexico The North Sea
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Integrity Management of Pipelines and Risers.
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Example 1: Dong Energy – Siri-Field – Si to Ni 10” WI line
Pipeline data 10” WI line (buried), Material grade SML 450 I DFPS. D (outer):273mm, WT (nominal): 14.4 mm (incl. 4mm corrosion allowance), L: 32 km.
Damage to pipeline 6 o’clock pitting corrosion. Wall thickness reduction of up to 70% leak at approx.3km from the Siri platform after 3,5 year in operation (design life: 15 year)
Cause of incident 6 o’clock Microbiologically induced corrosion.
Consequences and solution Replacement of corroded section of pipeline. A cleaning frequency of 1 month was recommended for further operation.
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Example 1: Dong Energy – Siri-Field
Nini
Cecilie
Siri
10" Water injection
10" Water injection
4" Gas lift
4" Gas lift
3” Gas lift
13 km
32 km
9 km
SCB-2 Water injection
8” Multiphase
12" Multiphase
14" MultiphaseStine S1
Production SCB-1
16" OilOil Storage tank
Umbilical
SAL System
Nini
Cecilie
Siri
10" Water injection
10" Water injection
4" Gas lift
4" Gas lift
3” Gas lift
13 km
32 km
9 km
SCB-2 Water injection
8” Multiphase
12" Multiphase
14" MultiphaseStine S1
Production SCB-1
16" OilOil Storage tank
Umbilical
SAL System
The Siri-Nini-Cecilie-Stine Field
Review of data from corrosion control, surveillance
data and procedures showed that the some part of
the pipeline integrity management system had not
been satisfactory implemented or in accordance
with own control program.
Management commitment
Revamp of Integrity Management System
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Example 2: Online monitoring of Ship Traffic
The ship specific information found in the AIS data can be improved by joining the sources
with a ship register
DNV holds a comprehensive ship register which is continuously monitored and updated
Other supporting data sources can be included in the DNV data model as e.g. pipeline
data,…
Aggregated data / export
For ship types and sizes
For selected time frame and area
Prepared for GIS presentation (selected grid )
Etc.
Real time AIS
data
Ship ID
Position (long/lat)
Speed
Etc.
Continuous data capture and processing
Modeling of:
Environmental performance
Safety analysis
Pipeline inspection planning (3rd party activity)
Other…
Ship register
Ship ID
Ship type
Ship particulars, size
Machinery details
Capabilities
Anchor size
Cargo types
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Integrity Management of Pipelines and Risers.
Example 2: Online monitoring of Ship Traffic - Trawling
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Motivation: The size of trawl gear has increased
over the last decades and trawling may impose
larger loads than the pipelines originally was
designed for.
Trawl Tracking: AIS (Automatic Identification
System) data can be used to track trawling activity.
Trawling Equipment: Each individual trawler has
been identified. Most of these have provided
information on equipment used
Pipeline trawl crossing frequency for different
equipment categories is calculated along the
pipeline route
Together with pipeline data and results from
external pipeline survey, this forms the basis for
- more detailed load analysis
- optimised mitigation actions (e.g. rock dumping)
- focused inspections (w.r.t. 3 party threat)
Fishing vessels 1000 - 4999 Gt
Example of fishing vessels & pipeline network
(density plot)
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Integrity Management of Pipelines and Risers.
Example 2: Pipeline vertical config.and trawl crossing frequency
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AIS_Total = Total number of crossings, AIS_CW_6-7_5T = Crossing with Clump weight between 6.0 and 7.5 tones
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Integrity Management of Pipelines and Risers.
Summary - Encourage system thinking
Interface management
Increased awareness
- know your system
- build cross discipline competence
- ensure transfer of experience
Compliance and Performance
- management commitment
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Integrity Management of Pipelines and Risers.
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Safeguarding life, property
and the environment
www.dnv.com