FEM model of offshore crane L11b-A
12/05/2025

Enersea enables LTE of Offshore Cranes with proven TCVT compliant methodology

Enersea’s methodology for conducting Life Time Extension (LTE) studies meets TCVT regime expectations, confirming its robustness and applicability for similar offshore studies.

One of the key projects where Enersea has applied this methodology was the LTE assessment of the offshore crane on the L11b-A platform, operated by ONE-Dyas. This project was conducted by Enersea in close collaboration with independent consultancy Maritime Advise B.V.

The primary goal of this study was to assess and support the long-term usability and safety of the crane, ensuring continued operational integrity and extending its service life. Maritime Advise supported the project by reviewing key calculations, adding independent assurance to the study.

The scope of the LTE study included:
- Review of available technical documentation and historical data
- Component assessment and conditions evaluation
- Modelling of the crane, including high stress areas
- Finite Element Analysis (FEA) for structural load spectrum calculation to accurately assess fatigue and structural performance.
- Development of a strategic replacement and refurbishment plan for critical structural components
- Review of the load cases in the crane SLI (Safe Load Indicator), scrutiny on the harsh environment load cases and likelihood of the crane working under such conditions

With this study, Enersea has provided ONE-Dyas with a clear and practical basis for the long-term use of the L11b-A platform crane. The study contributes to cost-efficient asset management and supports safe operations well beyond the original design life.

The collaboration with Maritime Advise B.V. brings additional expertise and an independent perspective, underlining the strength of joint industry efforts to support the long-term integrity of offshore equipment.