The article briefly describes the present international conventions and classification requirements based on the 1966 Loadline Rules, which would influence the type of hatch cover required in a ship. The influence of hull deformations on the design of hatch covers is described in detail, on the basis of research undertaken by Lloyd's Register of Shipping. A comprehensive mathematical model was used, based on a 120,000-dwt bulk carrier. Examples shown illustrate the effects of both general and local loading concerning changes in the dimensions of hatch openings. These effects will change significantly for any increase in still-water bending-moment or for the augment of wave bending-moment. The article states that 90% of all damage to hatch covers in container ships is to the plating. Calculations have shown that due to torsional loading, problem of frictional effects in hatch covers is also investigated, particularly for hatch covers bearing loads, as with container ships. The procedure for inspection of hatch covers and the analysis of defects is described. The paper concludes that linings and sealing arrangements are responsible for about 5% of defects and, if the number of failures is to be reduced, more attention to the design of the sealing of transverse bulkheads is needed. Effective draining of transverse bulkheads is necessary and they should be carefully inspected during "special surveys" and attention given to linings channels. Order from BSRA as No. 52,275.

  • Corporate Authors:

    Reenskaug (Bjarne H) AS

    Karl Johansgt. 8
    Oslo 1,   Norway 
  • Authors:
    • Lockhart, R G
  • Publication Date: 1977-6


  • Norwegian

Media Info

  • Pagination: p. 17
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00310787
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: May 7 1980 12:00AM