Knowledge Center
Site specific assessment
Safe, site-specific jack-up barge deployment.
A comprehensive
evaluation
1. Geotechnical Analysis
- Soil Characterization: Detailed geotechnical surveys are conducted to understand the seabed composition. This includes identifying soil layers, strength, and potential hazards like boulders or pipelines.
- Penetration Resistance: Evaluating the soil’s resistance to leg penetration helps predict the depth and stability of the legs once deployed.
- Punch-Through Risk: Assessing the risk of punch-through, where the leg suddenly penetrates deeper than expected due to weak soil layers.
2. Metocean Data
- Wave and Current Analysis: Assessing wave height, period, and direction is critical to ensure the sea state is within safe operational limits.
- Wind Conditions: Monitoring wind speed and direction helps in planning the deployment to avoid adverse weather conditions.
- Tidal Range and Storm Surge: Evaluating tidal variations and potential storm surges ensures the barge remains stable during deployment.
3. Structural Analysis
- Soil Characterization: Detailed geotechnical surveys are conducted to understand the seabed composition. This includes identifying soil layers, strength, and potential hazards like boulders or pipelines.
- Penetration Resistance: Evaluating the soil’s resistance to leg penetration helps predict the depth and stability of the legs once deployed.
- Punch-Through Risk: Assessing the risk of punch-through, where the leg suddenly penetrates deeper than expected due to weak soil layers.
4. Operational Planning
- Weather Window Assessment: Accurate weather forecasts and historical data help in identifying suitable windows for the operation.
- Route Optimization: Optimizing the towing route to minimize exposure to harsh conditions.
- Safety Margins: Defining safety margins for the deployment operation, including maximum allowable sea state and wind conditions.
5. Mitigation Measures
- Alternate Location: If the initial site is deemed unsuitable, alternate locations are considered.
- Pre-Load Reduction: Reducing pre-load to minimize the risk of punch-through.
- Weather Restricted Mode: Operating in a weather-restricted mode with a ‘cut and run’ approach if conditions deteriorate.
- Ground Improvement: Techniques like jetting or rock dump placement to improve seabed conditions.
6. Compliance and Standards
- ISO and SNAME Requirements: Ensuring the assessment complies with international standards like ISO 19905-1 and SNAME TR5-5A.
By conducting a thorough SSA, operators can ensure the safe and efficient deployment of jack-up barges, minimizing risks and optimizing operational performance. If you need more detailed information or specific guidance, feel free to ask!
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With highly qualified and specialized in-house engineers, Combifloat offers various engineering services to guide and support clients on operational and environmental matters.
Jaap Jan Pietersen - Managing Director
