ALTERNATIVE STRUCTURAL ARRANGEMENTS FOR A 500,000 DWT TANKER

Principles for structural arrangements of a 500,000 dwt tanker are studied as well as general design considerations incl. a general arrangement. Comprehensive calculations of strength and scantlings are made for the cargo tank portion of the hull for three different structural arrangements. Type no. 1 has a wash bulkhead in the centerline and longitudinal bulkheads at a distance of B/4 from CL. Type no. 2 has a strong CL-girder and longitudinal bulkheads at a distance of B/4 from CL. Type no. 3 has a CL-girder with low stiffness and longitudinal bulkheads on B/6 from CL. Type 1 is the heaviest alternative, while type 3 is slightly lighter than type 2. However, type 2 is the cheapest type. Steel weights and costs for the longitudinal material are calculated for various combinations of mild steel and high tensile steel (HTS; sigma sub y equal 36 kb/sq. mm; yield point equal 51200 psi). The most attractive solution is shown to be HTS in deck, bottom, sides and all longitudinals and mild steel in the longitudinal bulkheads. Systematic steel weight calculations by computer have been carried out for different main dimensions and transverse and longitudinal spacings. In this connection a comparison is made between different methods of calculation. Boundary conditions for stringers and program systems for the design of the ship's structure are discussed to some extent. Some technical consideration from shipowners' points of view have been included as well as impressions from a study made on subject literature. In Swedish.

• Corporate Authors:

  Swedish Ship Research Foundation

  Fack
  40270 Goteborg 8,   Sweden 
• Publication Date: 1970

Media Info

• Features: References;
• Pagination: 102 p.

Subject/Index Terms

• TRT Terms: Scantlings; Structural design; Tanks (Containers); Weight
• Old TRIS Terms: Cargo tanks; Weight calculation
• Subject Areas: Design; Marine Transportation;

Filing Info

• Accession Number: 00032220
• Record Type: Publication
• Source Agency: Ship Structure Committee
• Report/Paper Numbers: Rpt No. 63
• Files: TRIS
• Created Date: Apr 21 1972 12:00AM