The RS-7 Digital Acoustic Position Indicator has been in use for some time on drilling vessels as a position indicator for re-entry functions and as a control input source to command dynamic vessel position (DP) systems. It also has the capability of providing riser angle and riser/BOP stack differential angle information and is finding increasing utilization in these roles. The Diff-2 option extends the capability of the RS-7 series to permit the system to accurately measure, and simultaneously display with a common range, the position of a surface vessel, a fixed ocean floor reference and a variable depth submersible, without sacrificing the performance and features of the basic system. This will allow the surface vessel to operate in a known positional relationship to the sumbersible thus preventing its being fouled or pulled off its intended course or location by its tether cable to the ship. A description of the system and its operation is given.

  • Availability:
  • Corporate Authors:

    Petroleum Publishing Company

    1200 South Post Oak Road
    Houston, TX  United States  77027
  • Authors:
    • Robertson, R
  • Publication Date: 1977-1

Media Info

  • Pagination: p. 46-48
  • Serial:
    • Offshore
    • Volume: 37
    • Issue Number: 1
    • ISSN: 0030-0608

Subject/Index Terms

Filing Info

  • Accession Number: 00149607
  • Record Type: Publication
  • Source Agency: Petroleum Publishing Company
  • Files: TRIS
  • Created Date: Apr 13 1977 12:00AM