Stability Test Support

DMS assisted another naval architect with the stability test of a T-AO resupply ship.  These massive ships support the US Navy by resupplying naval warships at sea (underway replenishment, or UNREP).  To achieve this mission, the ship comes with some impressive deck hardware.  Equally impressive is the cargo capacity.  Most of the ship’s cargo space is devoted to oil tanks.  (The majority of surface ships in the US Navy are not nuclear.)  But the vessel also contains several holds for dry cargo, filled with everything from spare washing machines to dry food stores.  The dizzying maze of cargo holds, passageways, and deck machinery enables this vessel to support the US combat vessels.

 

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(USNS Lenthall, a similar T-AO vessel.)

DMS assisted another naval architect with the stability test of a T-AO resupply ship.  These massive ships support the US Navy by resupplying naval warships at sea (underway replenishment, or UNREP).  To achieve this mission, the ship comes with some impressive deck hardware.  Equally impressive is the cargo capacity.  Most of the ship’s cargo space is devoted to oil tanks.  (The majority of surface ships in the US Navy are not nuclear.)  But the vessel also contains several holds for dry cargo, filled with everything from spare washing machines to dry food stores.  The dizzying maze of cargo holds, passageways, and deck machinery enables this vessel to support the US combat vessels.

Scope of Work

DMS assisted with the stability test.

A wise man once asked, “Can the ship capsize?”  Thanks to careful analysis from naval architects, the chances are very slim.  That analysis begins with a stability test, to determine the exact center of gravity of the vessel.  Stability tests evolved to become half scientific experiment, and half regulatory compliance.  We have exacting rules to follow, and a high standard of accuracy to achieve.  Very challenging to turn a working vessel into a scientific experiment.  Stability tests generally involve three stages:

  • Deadweight survey
  • Freeboard measurements
  • Incline experiment

DMS assisted with completing the deadweight survey, freeboard measurements, and the primary incline experiment.

Technical Capabilities

A stability test requires more than just following the procedure.  Vessels never exactly match the requirements of the test procedure.  Instead, the engineers must adapt on site to changing conditions.  This requires a detailed understanding of how each decision impacts the final test results.  Although we do our best to accommodate the crew, the first priority is a successful stability test.  Because the only thing more disruptive than a stability test is two stability tests, because the first one had bad data.  DMS understands stability tests, the ASTM test standards, and the practical limitations of working vessels.

Client Support

Nicholas Barczak was able to support our client almost immediately after arriving on site.  After a short vessel orientation, DMS immediately jumped into the tasks, progressing from deadweight survey to tank inspections, tank soundings, and more.  Thanks to the familiarity with the testing standards, Mr. Barczak knew the stages of the test and anticipated the next phase of work.  This is the advantage of an experienced naval architect:  someone that understands the purpose of the project and can anticipate the requirements.

Testimonials

My company hired Datawave Marine Solutions to provide us with an additional Naval Architect for a Deadweight Survey and Stability Test aboard the USNS LARAMIE, T-AO 203.  I was impressed with Mr. Barczak’s knowledge, attention to detail, and ability to dive right into the project.  I look forward to using DMS again in the future.

 Randy Brown

President

Charleston Marine Consulting, LLC

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