Structural Integrity Management System (SIMS)
Structural integrity management (SIM): The means of ensuring that the people, systems, processes and resources that deliver structural integrity are in place, in use and will perform when required over the whole lifecycle of the structure in accordance with the Offshore Installations and Wells (Design and Construction, etc.) Regulations.
The means of ensuring structural safety on floating structures is currently being formulated. As many floating installations have a degree of Class, the interaction between the requirements of Class and the Regulations is under study. However principles and technical requirements will probably not change.
Impact of this policy
The standard set by this policy is compatible with the International Standards Series for Offshore Structures and there should be no adverse impact on new installations, or on existing structures. A structured approach to structural integrity should bring considerable benefits, especially in relation to ageing and life extension matters.
Nature of threat
SIM activities cover these elements and are monitored by independent verification. These changes have necessitated a change in the way structural integrity is approached and the requirement for a managed approach has developed.
PT. Bina Rekacipta Utama has been developed for oil and gas production for over 15 years, and a significant body of structural integrity management (SIM) practice has developed. This practice must now reflect the fact that structures are in various phases of damage and/or deterioration, including those that now exceed their originally intended operating life.
SCEs (Safety Critical Elements) are defined (in the Offshore Installations (Safety Case) Regulations 2005 (SCR) as parts of an installation and its plant whose purpose is to prevent, control or mitigate major accident hazards and the failure of which would cause or contribute substantially to a major accident.
There are no precise methods to quantify risk of structural failure and sound engineering principles are required to keep this risk to a low level. These principles involve interactions between design, construction and life time inspection and the management of these interactions. Managing the risk by use of techniques and methods in the ISO Standards for offshore Structures is used to ensure that no sudden, catastrophic failure is encountered.
Management elements of all safety systems should be drawn together in the duty holder’s management system and elements for a structural integrity management system that follows good practice include:
- Organisation and management
- Structural integrity management policy and strategy
- Inspection strategy
- Information management
- Structural evaluation
- Sub-sea intervention
- Audit, review and continual improvement
- Life extension evaluation
With many offshore installations in the UK sector of the North Sea now reaching or exceeding their original anticipated design life, there is a particular need to evaluate approaches to structural integrity management by offshore operators to ascertain their adequacy in managing ageing structures. In addition to this, a significant proportion of the ageing structures are now operated by duty holders who are not the original duty holders and hence may have limited knowledge of the structural integrity history of the structure. A pilot study by HSE, undertaken during 1995-1996 and the results of the KP3 audit programme have highlighted the varying approaches to structural integrity management by duty holders, in terms of both the methods used and their effectiveness.
The definitive modern standards for structures are those of the International Standards Organisation (ISO) which contain world wide, harmonised practice:
- ISO 19902 for Fixed Steel Structures
- ISO 19903 for Concrete Structures
- ISO 19904 for Floating Installations
Offshore Installations (Safety Case) Regulations 2005
Offshore Installations and Wells (Design and Construction, etc) Regulations1996
Offshore Installations (Prevention of Fire and Explosion, and Emergency Response) Regulations 1995 (PFEER)
Examples of evidence and remedial actions
Compliance with ISO Standards or equivalent which includes:
An appropriate SIM system which is achieved by identifying the gaps in current installation specific operating practice and the practice outlined in the ISO Standard, prioritise the needs, assess resource needs and costs, and managing their implementation. This may cover all or some of the following:
- Identify current practice: In order to aid the gap analysis, current practice should be identified in a structured manner and be documented.
- Identify good SIM practice: The good SIM practice is provided in the relevant ISO standard.
- Gap analysis: The objective of the gap analysis is to identify discrepancies between current practice and good practice, and prioritise where improvements are required.
- Develop implementation plan: The implementation plan should be based on the Gap analysis, taking into consideration realistic budgets, timescales, resources and time constraints. The implementation plan should include the following:
- Documented gap analysis
- Identification of resources
- Budget requirements
The implementation plan should be fully documented and provide appropriate rationale for any departures from good practice.
- Delivery of implementation plan: The implementation plan should be delivered as a formal project.
- Monitor and feedback: The effectiveness of the implementation plan should be reviewed periodically and the implementation plan adjusted when required
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