Welcome to ABL Group
ABL Group is a leading global independent energy and marine consultant working in energy and oceans to de-risk and drive the energy transition across renewables, maritime and oil and gas sectors. Based in more than 300 locations worldwide and consisting of the following group companies.
The energy and marine consultantsView Website
The offshore wind consultantsView Website
The marine renewables engineering and R&D consultantsView Website
The independent engineering, design and analysis consultantsView Website
The marine surveyor and risk consultantsView Website
The superyacht surveyors and consultantsView Website
East Point Geo
The geotechnical, geophysical and geological consultantsView Website
The ship design specialistsView Website
Site Specific Assessment (SSA)
Longitude provides engineering services relating to the location approval for jack up units. Our expertise in this field is a result of the significant experience of our marine and engineering staff with respect to the operational safety of these vessels.
Specialists in Site Specific Assessment
Longitude has developed an extensive in-house database of jack up units and together with our services relating to soil characterisation and evaluation, we are able to undertake site specific leg penetration and extraction studies. Where required a full site-specific assessment can be undertaken taking into account both geotechnical and structural considerations.
Longitude Engineering undertakes our assessment to recognised codes, which include SNAME 5-5A and or ISO 19905-1.
Site Assessment Engineering
In order to assess the suitability of a site for jack up vessels, our engineers can provide the following assessments as part of a location approval by MWS:
- Leg Penetration Analysis (LPA)
- Site Specific Assessment based on ISO or SNAME Requirements
- Punch Through Survival and Recovery
- Dry Transportation Design and Verification
- Scour and Leg Extraction
- Site Spot Metocean Report
- Site Zoning and Preload optimisation
- Leg Seabed Impact Analysis
- Operability Analysis
For floating units such as drillships and semi submersibles, we provide anchor patterns, mooring analysis, line profiles and riser analysis.
Our experience enables us to recommend mitigation measures where the safety of jacking operations has been identified as a risk, these may be as follows:
- Alternate Location
- Reduction in Pre-Load
- Operate in Weather Restricted Mode with ‘Cut and Run’ Approach
- Ground Improvement e.g. stomping or rock dump placement
- Spud-can modifications
Case Studies View All
Longitude Completes Engineering Base Scope on FPSO Conversion
Longitude Engineering has completed its engineering base scope for Yinson’s vessel conversion of an FPSO destined for Brazil, including naval architecture, structural engineering and hydrodynamic analysis. “The FPSO…
OSD-IMT9721 Salvage Vessel
Principle Characteristics LOA: 79.40 m Beam: 16.00 m Depth: 7.30 m Summer Load Draught: 5.80 m Deadweight: 2000 t approx
Hybrid Standby Safety Vessel OSD-IMT951
Principle Characteristics L.O.A.: 50.70 m L.B.P.: 47.40 m Breadth mld.: 13.00 m Depth: 6.00…