SYSTEMATIC SEQUENCING FOR LOADING OR OFFLOADING TANKERS

The sequence in which loads are placed on board or removed from a ship is an important factor, when one is considering the bending moment and shear force curves of the hull girder. It is relatively easy to place loads on a ship that would cause the bending moment or shear force to exceed the design or allowable values. In tankers the problem of sequencing becomes more noticeable because the loads are relatively large and the location of the loads cannot be varied. However, these vessels are designed so that when fully loaded or in ballast, the stresses on the hull girder are at an acceptable level. The problem then is one of proceeding from one condition to another, for example from the full load condition to the ballasted condition. The tanks are unloaded in a sequence designed to keep the stresses in the hull at an acceptable level during the entire operation. This sequence is the basis for this paper; that is, to find a feasible loading or offloading sequence for a tanker that maintains acceptable stresses due to shear force and bending moment throughout the hull. In order to find a feasible sequence, a method must be devised to accurately and efficiently predict the bending moment and shear caused by the addition or removal of a load. Once this has been accomplished, a scheme must be devised to use these predictions in establishing a sequence.

• Supplemental Notes:
  • Presented at the Northern California Section Meeting of SNAME.
• Corporate Authors:

  Society of Naval Architects and Marine Engineers

  601 Pavonia Avenue
  Jersey City, NJ  United States  07306-2907
• Authors:
  • Lorenz, D B
• Publication Date: 1973-9-13

Media Info

• Features: References;
• Pagination: 41 p.

Subject/Index Terms

• TRT Terms: Bending moments; Hulls; Longitudinal strength; Shear stress
• Old TRIS Terms: Hull bending moments; Hull shear stress
• Subject Areas: Freight Transportation; Marine Transportation; Materials;

Filing Info

• Accession Number: 00053940
• Record Type: Publication
• Source Agency: Society of Naval Architects and Marine Engineers
• Files: TRIS
• Created Date: May 7 1974 12:00AM