During the last 10 to 20 years, with the increased size of ships and offshore structures, there has been a considerable change in ocean-towing operations. The Author, of Smit International, describes and discusses the design of tugs for these new conditions. Dealing with the general layout of these ocean-going tugs, the Author discusses wheelhouse and engine-room locations, the functions of the wheelhouse in the control of the tug and its machinery and deck equipment, and the provision of cranes (which are advisable for handling the heavy equipment used); other aspects of layout discussed include the importance of a high standard of accommodation. For propulsion, twin ducted c.p. propellers driven by medium-speed engines would be a normal choice. Hull dimensions are mainly determined by the amount of fuel to be carried; length, breadth, depth, and draught considerations are discussed. A moderate bulb form forward can improve performance, particularly for a tug with a full body; a moderate V-form and a high-bow are the best solution forward for seakeeping qualities. The design of the stern needs careful attention, especially in way of the nozzle-to-hull connection. A good towing arrangement is that with a towing storage-winch (used only for storage of the wire and needing much less holding capacity than a normal towing-winch) together with friction drums to take the forces during towing, such an arrangement is described and illustrated. Other deck equipment is also discussed, and some advantages of vertical-shaft windlasses are mentioned. Measures that can be taken to alleviate noise problems in ocean-going tugs, including floating floors, ceilings, and linings, are described, and sound-level readings taken during the trials of a new tug of this type, the Smit New York. Order from: BSRA as No. 47,882.

  • Corporate Authors:

    International Tug Convention (5th)

    Rotterdam,   Netherlands 
  • Authors:
    • Gelderblom, H
  • Publication Date: 1977-4

Media Info

  • Features: References;
  • Pagination: 8 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00174260
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Report/Paper Numbers: Proceeding
  • Files: TRIS
  • Created Date: May 31 1978 12:00AM