Scope
Jee supported a client with an assessment of impact damage on a production manifold during the planning of a subsea control system intervention.
Solution
Jee broke down the problem into the following objectives:
- Reviewed component and structure geometries, lifting arrangements and associated procedures.
- Determined credible impact scenarios, considering the lift being completed and the infrastructure affected.
- Identified the scenarios likely to result in the greatest impact energy or potential to cause significant pipeline dent formation and agreed these with the client.
- For each of the scenarios identified, Jee determined the respective impact energies and estimated dent dimensions in accordance with the approach specified in DNV-RP-F107.
- From the dent dimensions, determine the potential for loss of containment, using the guidance provided in DNV-RP-F107.
Component dimensions and weights were incorporated into the assessment to tailor the assessment to the specific situation that would be experienced by the client. From this the terminal velocities and impact energies of dropped objects were better understood. This information was then used to evaluate the likelihood of loss of containment.
Conclusions
The finding of this particular assessment found there to be 2 cases where minor damage would be incurred and 2 cases where major damage in form of a dent that would lead to a loss of containment. This information was delivered to the client in the form of a technical note. Additionally, the client was advised on monitoring strategies for the minor damage cases to ensure they would not escalate over time. The results of the assessment enabled the client to understand the risks associated with the activity, allowing them to put in place suitable mitigation prior to executing the lift.
For more information, visit https://www.jee.co.uk/integrity-management
To contact our Technical Authority, Graham Wilson, email graham.wilson@jee.co.uk, or call +44 (0)1732 371 371.
Jee Ltd
