A brief description is given of a mooring-load monitoring system developed by Strainstall Ltd, of Cowes, Isle of Wight, for keeping constant watch on the tension in the mooring lines of large ships at oil terminals. The loads in the swivel pins of the mooring hooks on the jetty are continuously measured by resistance strain-gauges, and the voltages produced are transmitted, through intrinsically safe amplifiers, to a central console for processing. The resulting data are shown on a colour video display unit. The display is in the form of a mimic diagram of the ship and her moorings, above a bar chart that indicates the load in each hook; if there is an overload or underload in any hook, the colour of the corresponding bar will change and an alarm is flashed and sounded. The console is usually placed in the terminal's control room, with a repeater on the ship's bridge or at the head of the brow; additionally, changing tension in a mooring can be displayed digitally for winch operators. The article also includes some general information on dynamic loads in the mooring lines of VLCCs, and mentions that work at the National Engineering Laboratory, in association with Esso Petroleum, has shown that 95% of the total load is taken by not more than three lines in a mooring pattern of up to twenty lines. The usefulness of load monitoring for a ship at a single-point mooring, for the deep-sea towing of unwieldy structures, and for "star" moorings for oil-rig supply vessels (3-point moorings enabling them to work cargo in bad weather) is also briefly discussed. Order from BSRA as No. 52,376.

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  • Corporate Authors:

    Seehafen-Verlag Erik Blumenfeld

    Celsiusweg 15, Postfach 1347
    2000 Hamburg 50,   Germany 
  • Publication Date: 1979-10

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Filing Info

  • Accession Number: 00310796
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: May 7 1980 12:00AM