Structural integrity

management

Ageing structures
Workshop April 8th

PTIL/PSA
Ageing and life extension

12/04/2010
PTIL/PSA
2
PTIL/PSA
The main elements in the process of
initiating and conducting an assessment
of a structure (ISO 19902)
a) assemble data on the structure, its history and exposure level;
b) determine if any assessment initiators are triggered;
c) determine acceptance criteria;
d) assess the condition of the structure;
e) assess the actions,
f) screen the structure in comparison with similar structures,;
g) perform a resistance assessment, using:
⎯ design level analysis;
⎯ ultimate strength level analysis;
h) prevention and mitigation

PTIL/PSA
Tasks that needs emphasis in life
extension
• Predict future degradation including wide spread
degradation and the consequences from this
degradation.
• Plan inspections and maintenance taking that
degradation into account
• Evaluate if components can be inspected
• Evaluate criticality of components

PTIL/PSA
Projects in PSA:
Structures and materials
• Probabilistic inspection planning of ageing
structures
- Aalborg University
• Regulation of life extension in Nuclear industry in
USA
• Material risk ageing installations
- DNV, SINTEF, Cranfield University
• SIM CMM
- OceanStructures / Cranfield University
• Ageing of concrete structures
- OceanStructures / Cranfield University
• Joining of materials

12/04/2010
PTIL/PSA
8
Structural integrity management

PTIL/PSA
 Goals & Req. Maintenance Prog. Planning Execution
Input 2.1
Evaluate Outputs
s 1.1 design,
2.2
Organisation Develop and inspection
Define Long 3.1 4.1
term Inspection Inspection
update SIM data and
inspection planning execution
Philosophy analyses
programme Technical
including
8.1 Allocation & ageing Condition
management of
resources & Report
10.1

Resources 11.1
11.2 Tech. Assure integrity
QA/QC Supervision Independent
Documents verification condition 10.2
9.1 Compare with
Develop DFI KPIs
resume
10.3
9.2
Improvements Analyses Reporting Management
In-service reporting
history 6.1
7.1
Evaluate,
Evaluate 5.2 5.1
analyse and
efficacy of Manage SIM Reporting on
assess
inspection data inspections
inspection
programme
data

Assessment Repair & mitigate Life extension Emergency preparedness

S1.3 S3a S3b
S4.2
Assessment Manage life Particular S4.3
S2.1 S2.2 S4.1 Understand
S1.1 S1.2 of extension issues for Prepare for
Determine Plan and Awareness significance
In-place Fatigue robustness approval ageing of potential
repair and undertake of potential of potential
structural assessment (redundancy process – mobile units emergency
mitigation remedial emergency emergency
assessment , tolerance to production – Classed situations
measures actions situations situations
damage) installations installations
PTIL/PSA
only only
 5

4,5

3,5

Lowest
2,5
Highest
Average
2

1,5

0,5

0
7.1 8.1 9.1 9.2 10.1 10.2 10.3 11.1 11.2 S1.1 S1.2 S1.3 S2.1 S2.2 S3 S4.1 S4.2 S4.3

PTIL/PSA
Key areas of concern in SIM

• Understanding ageing
- competency,
- data logging and trending
- life extension
• Technical condition evaluation and reporting
- KPI's,
- management reporting
• Emergency preparedness
• QA / QC and verification

PTIL/PSA