Intact Stability Analysis

Most vessels need some form of intact stability analysis to satisfy regulatory requirements.  The exact analysis and requirements depend on the flag of the vessel, vessel mission, and vessel construction type.  Generally, the analysis follows a routine procedure:

  1. Regulatory research – determine the exact set of stability criteria
  2. Hydrostatic modeling
  3. Maximum VCG analysis
  4. Develop loading conditions
  5. Check loading conditions
  6. Document results in analysis report

The main deliverable from this analysis is a maximum VCG graph.  It plots the limit of vessel vertical center of gravity (VCG) against a range of displacements.  If the vessel VCG remains under those limits, it satisfies all intact stability criteria.

To ensure reliability, DMS goes one step further.  We check the individual loading conditions against the stability criteria.  Thanks to the automation of Maxsurf Stability, this is a fairly quick process.

FREE Loading Condition Spreadsheet

DMS also cares about delivering practical utility to the vessel crew.  Ultimately, stability analysis should be a tool for the vessel master to ensure safe operation.  The best tools are easy to use and convenient.  Along with the stability analysis, we also provide a free loading condition spreadsheet.  This incorporates your custom tank properties and MaxVCG curves.  It allows you to easily develop custom loading conditions for yourself. 

Plan your own burn-ballast sequence for each voyage.  Safely check transfers between tanks.  Other firms may charge you tens of thousands for a fancy program that achieves the same functionality.  But at DMS, we think the knowledge is more important than the appearance.  That is why we automatically include the loading condition spreadsheet with each update that includes a trim and stability booklet.  Want to learn more about your free loading condition spreadsheet?  We’re happy to talk.

The fine print:

  1. Loading condition spreadsheet is NOT a substitute for a class approved loading computer.  It is only a convenient tool for the vessel master.
  2. Stability update requires a full trim and stability booklet to provide a free loading condition spreadsheet.  Stability letters and stability assessments do not receive a free loading condition spreadsheet.

Want to Learn More?

We can customize each project to meet your goals.

Find the perfect solution for your needs.

Relevant Ship Science Articles

Improve Engineering Value

We all want to feel good about paying for engineering analysis. Sometimes the best answer drives us to maximize value, rather than minimize cost. In those cases, you do better to go beyond basic safety and search for enhancements. Today we discuss four engineering tasks where you can maximize your value. Extract every last drop of knowledge from your engineering project.

read more

Stability Fails at Seakeeping

Stability and seakeeping are frequently misunderstood. To understand the limits of these sciences, we must unveil the motivation behind their development. How to guarantee ship safety on an uncertain ocean?

read more

Video: Selecting the Right Hullform

Monohull, catamaran, trimaran . . . so many choices. Which hullform to pick? Can we draw upon any science to guide our choices, or we beg Lady Luck to guide us? This article provides a rational and design map for selecting hullforms applicable to any type of mission. This organized approach allows us to see past the limitations of historic examples and consider new alternatives.

read more

GHS Tutorials: Macros and Scripting

GHS is nothing without macros.  They expand GHS into a repeatable and adaptable programming language.  They make all the frustration worth the effort.  The GHS user that masters macros can harness the full power of computer automation for stability and hydrostatics....

read more