DAMAGE EXPERIENCE, POTENTIAL DAMAGES, CURRENT PROBLEMS INVOLVING SLOSH CONSIDERATIONS
In oil tankers, sloshing is not a particularly important design aspect because of the damping effect of the internal tank-structure and because tank size is fairly small compared with ship size. Sloshing damage to stringers in a wide forepeak tank in a large oil tanker, and the possible cause of damage to stainless-steel membranes in a chemical tanker, are briefly discussed. In bulk carriers, including OBO carriers, the large "clean" holds are susceptible to heavy sloshing; three cases of sloshing damage to such ships are described. Filling ratios in the 20-90% range are now prohibited in bulk carriers, unless the structures are specially reinforced. Sloshing as a potential source of ignition, and the ICS investigations on explosions in combination carriers, are briefly discussed. Sloshing is of particular importance in LNG carriers, whose large tanks are, usually, without internal restrictions. The type of loading in these tanks, and the tank responses, are discussed, together with some instances of actual damage. Spherical LNG-tanks have not sustained any sloshing damage, but they are susceptible to violent liquid motions; for these tanks, the determination of the combination of the ship's rolling motion and the liquid sloshing motion is very important. Future design considerations are discussed in general terms. It is important that sloshing should be studied in any development of new ship-types that incorporate large and/or clean holds or tanks partly filled with liquid.
- Seminar on Liquid Sloshing.
Norske VeritasGrenseveien 92, Etterstad
Oslo 6, Norway
- Hansen, H R
- Publication Date: 1976-5
- Features: References;
- Pagination: 14 p.
- TRT Terms: Bulk carriers; Free surface; Liquefied gases; Liquefied natural gas; Ore bulk oil carriers; Sloshing; Tankers
- Old TRIS Terms: Damage stability; Free surface effects; Obos
- Subject Areas: Marine Transportation; Safety and Human Factors;
- Accession Number: 00152582
- Record Type: Publication
- Source Agency: British Ship Research Association
- Report/Paper Numbers: Paper No. 2
- Files: TRIS
- Created Date: May 11 1977 12:00AM