The type of single-anchor mooring described in this report has been successfully installed and recovered in depths of up to 1000 m, well within the design depth capability. It has proved simple to handle, both from a modern research ship with bow-thrusters, hydraulic cranes and special winches, and from a side trawler, using the trawl winch and the yo- yo derrick. Indeed the basic technique varies only slightly from vessel to vessel. The instruments used on the rigs are the Aanderaa current-meter and the Aanderaa thermistor chain, recovery being effected by an AMF acoustic release. The main anchor is made up of scrap used stud-link cable in two clumps of about 385 kg each. These are the standard clumps used with our "U" moorings. Each clump is held together with a 9.5 mm link chain, the two ends of which are shackled together giving a single clump anchor weight of about 770 kg. The exact weight of each anchor used is determined by means of a "Crane weigher". Attached to the main anchor is a 10 m length of 13 mm galvaized steel chain terminating in a 34 kg "Danforth" type anchor, known as a Meon Mk7. This anchor will withstand a 4,500 kg pull in good holding ground. It is added to the rig simply as a safety measure to avoid the rig "walking" in very high current speeds or when the mooring is deployed on the continental slope.

  • Corporate Authors:

    Department of Agriculture and Fisheries, Scotland

    Aberdeen,   Scotland 
  • Authors:
    • PAYNE, R
  • Publication Date: 1975

Media Info

  • Pagination: 7 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00141221
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Report/Paper Numbers: Scott Fish No. 1 Res. Rpt.
  • Files: TRIS
  • Created Date: Oct 26 1976 12:00AM