LIQUID IMPACT LOADS IN PARTIALLY FILLED TANKS OF A 125,000 CUBIC METER LNG CARRIER

Describes the results of an experimental study conducted to determine the impact pressures and forces on 125,000 cu m LNG carriers when liquid petroleum gases other than LNG are transported in partially-filled tanks. The need for partial filling results from the higher specific gravities of other liquefied gases relative to LNG. To maintain a static cargo weight equivalent to a full tank of LNG requires fill depths (h/H) of 0.787, 0.869, 0.906, and 0.909 for butane, propane, ethane, and ethylene, respectively. At these reduced fill depths, liquid cargo sloshing can produce much higher dynamic loads on the tank structure than would occur in a full tank. To establish these loads, dynamic impact pressures, forces, and moments were measured on 1/50 scale models of tanks experiencing resonant sloshing at fill levels between 0.75 and 1.0. This model data, in combination with scaling criteria previously established were utilized to predict full-scale slosh loads.

  • Supplemental Notes:
    • Prepared for Methane Tanker Service Company, P.O. Box 2185, 2727 Allen Parkway, Houston, Texas 77001.
  • Corporate Authors:

    Southwest Research Institute

    6220 Culebra Road, P.O. Drawer 28510
    San Antonio, TX  United States  78228-0510
  • Authors:
    • Bass III, R L
    • Oldham, G A
  • Publication Date: 1975-2

Media Info

  • Features: References;
  • Pagination: 35 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00139683
  • Record Type: Publication
  • Source Agency: Southwest Research Institute
  • Report/Paper Numbers: SWR Proj #02-4062 Tech. Rpt.
  • Files: TRIS
  • Created Date: Sep 16 1976 12:00AM