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STABILITY ANALYSIS

Offshore Projects Consultants provides stability analysis for vessels and floating structures, supporting new designs, vessel modifications and marine operations.
We assess the effect of loading, equipment installation, cargo operations, lifting and ballasting on a vessel’s stability. Our work provides clients, vessel operators and approval authorities with clear evidence that the vessel can operate safely within the required limits.

Our Capabilities

OPC can provide engineering support for:

  • Intact and damage stability analysis
  • Stability assessments for vessel modifications
  • Stability book preparation and revision
  • Creation of vessel models from lines plans and other available information
  • Reverse engineering of hull forms where drawings are incomplete
  • Tank capacity and sounding table calculations
  • On site inclining experiments
  • Lightweight surveys and weight reconciliation
  • Stability assessments for lifting operations
  • Ballasting plans for RoRo operations
  • Documentation for class, flag or third-party review

OPC can create three-dimensional vessel models from lines plans, offset tables, general arrangement drawings and existing hydrostatic information. Where original drawings are unavailable, the hull form can be reverse engineered using available vessel information and survey measurements.
We can also prepare and conduct inclining experiments on site, analyse the results and produce the final stability book for submission to the relevant approval authority.

Vessel Modifications and Marine Operations

The installation, removal or relocation of equipment can significantly affect a vessel’s displacement, trim and centre of gravity. OPC assesses proposed modifications and develops revised loading conditions where required.
We also provide project specific stability assessments for:

  • Heavy and offshore lifting operations
  • Equipment mobilisation and demobilisation
  • RoRo operations
  • Cargo transportation
  • Equipment deployment and recovery

The analysis can be used to establish ballast requirements, allowable load positions and operating limits.

Standards

Stability analyses are undertaken in accordance with the requirements applicable to the vessel and its area of operation. These may include:

  • IMO International Code on Intact Stability
  • Applicable IACS member classification society ship rules
  • Flag state and statutory requirements
  • ES-TRIN requirements for inland navigation vessels
  • National requirements for inland vessels
  • Client and project specific criteria

Deliverables

Depending on the project scope, OPC can provide:

  • Intact and damage stability reports
  • Stability books and revisions
  • Vessel models and hydrostatic data
  • Loading condition calculations
  • Limiting KG or maximum VCG curves
  • Tank capacity and sounding tables
  • Weight and centre of gravity reports
  • Ballast plans and operating sequences
  • Inclining experiment procedures and reports
  • Class submission documentation

Supporting Safe Vessel Operations

Whether assessing a vessel modification, conducting an inclining experiment or preparing a stability book, OPC provides practical stability engineering focused on safety, compliance and efficient operation.