SUMMARY OF DEVELOPMENT OF LNG TANK DESIGN ACCELERATION RULES

Progress and results are offered from a two year research project devoted to LNG tank design guidelines. Five LNG tank vessels were examined ranging in capacities from 29,000 to 200,000 cu.m, including spherical and membrane tank systems. Design accelerations are selected from the extreme values by applying operator strategies in storms. This involved speed reduction, heading change to limit vessel motions, most likely headings, etc. Vertical acceleration is the single most important acceleration component which determines the design pressures. Lateral and longitudinal accelerations do not appreciably affect design pressures. The vertical accelerations are strongly dependent upon ship length with the shorter ships having substantially higher design accelerations than the longer ships. The predicted accelerations tend to be somewhat conservative. In order to improve the accuracy of these predictions better speed loss models are required for the shorter ships and better extreme wave data is required for the longer ships.

• Corporate Authors:

  David Taylor Naval Ship R&D Center

  Bethesda, MD  United States  20084
• Authors:
  • Baites, W G
  • Meyer, W G
  • Bales, S L
• Publication Date: 1976-12

Media Info

• Pagination: 76 p.

Subject/Index Terms

• TRT Terms: Design; Impulses (Mechanics); Liquefied natural gas; Loads; Ship motion; Speed control; Stresses; Structural analysis; Structural mechanics; Tanks (Containers); Traffic speed
• Uncontrolled Terms: Speed reduction; Structural response
• Old TRIS Terms: Impulsive loading; Lng tank design; Tank design; Tank stresses
• Subject Areas: Design; Marine Transportation;

Filing Info

• Accession Number: 00158244
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: USCG-D-13-77 Final Rpt.
• Files: TRIS
• Created Date: Aug 31 1977 12:00AM