Trim and Stability Update
Before you cut steel and start modifying your vessel, consider ship stability. If you forget about stability, modifications may make your ship unsafe for sea.
I have seen owners completely repower their vessels and ignore stability. Afterwards, they discovered that the vessel could not pass inspection, all due to ship stability. Don’t get caught by surprise. Plan for ship stability and control the changes.
Get Your FREE Technical Briefing
Learn about the technical risks before you commit to a project.
After every major vessel modification, you generally need to update the vessel’s stability documentation. With only a 2% change in light ship weight, a stability test may become necessary. For many vessels regulated by the US Coast Guard, it becomes required. (See MTN 04-95.)
After the stability test, you need a new stability analysis and an updated trim and stability booklet. Our services include many different forms of stability analysis.
- Intact stability
- Passenger vessel stability
- Subdivision draft / Load line calculation
- Damage stability
- Probabilistic damage stability
- Longitudinal strength
- Stability improvements
We provide stability analysis that clearly identifies the chain of applicable regulations and outlines your requirements. Critical points are identified, and we provide recommendations for any small changes that may improve vessel stability.
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 trim and stability update, 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 when developing a trim and stability booklet. Want to learn more about your free loading condition spreadsheet? We’re happy to talk.
The fine print:
- Loading condition spreadsheet is NOT a substitute for a class approved loading computer. It is only a convenient tool for the vessel master.
- 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
Ready to discuss your next project. DMS is ready to join your team.
Relevant Ship Science Articles
What are the practical steps necessary to execute a stability test? How to avoid the pitfalls? Who do you call to arrange everything? This guide gives advice to the vessel owner on how to prepare for a stability test, from start to finish. Instead of theory, we focus on the logistics and coordination.
Certain as the sea, ships will require stability tests at some point in their life. Or maybe not. This article discusses the different types of stability tests and when regulations require them.
Stability tests do not arrive instantly after you order one. It takes time and planning, and you should expect extensive coordination with several different organizations. But the ultimate benefit justifies the expense: a ship with reliable stability performance. This article unravels some of the mystery behind a stability test and why you want one.
The physics of model scaling make it impossible to perfectly convert between model scale and ship scale. Learn how to get around the scaling correlation problem and convert from model scale to ship scale measurements.
Time for an upgrade! Far beyond the single purpose testing facility, the modern towing tank expanded into a Swiss Army knife of experiments. Armed with new gadgets and advanced capabilities. Time to see what new tricks the tank holds for us!