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Riser Angle Based Position Reference System

[+] Author Affiliations
Asgeir J. So̸rensen, Bernt J. Leira, Carl M. Larsen, Paul Erik Ho̸iskar

Norwegian University of Science and Technology, Trondheim, Norway

Paper No. OMAE2002-28077, pp. 131-139; 9 pages
  • ASME 2002 21st International Conference on Offshore Mechanics and Arctic Engineering
  • 21st International Conference on Offshore Mechanics and Arctic Engineering, Volume 1
  • Oslo, Norway, June 23–28, 2002
  • Conference Sponsors: Ocean, Offshore, and Arctic Engineering Division
  • ISBN: 0-7918-3611-8 | eISBN: 0-7918-3599-5
  • Copyright © 2002 by ASME


The requirements to reliability and accuracy have resulted in requirements for DP systems to class notations compliant to the International Maritime Organization (IMO) [7] equipment class 2 or 3. For both class notations it is required 3 position reference systems, whereof at least 2 systems should be based on different principles for the class notation to be maintained. Installation of satellite based systems and hydro-acoustic systems normally accomplish this. However, both of these systems are subject to degradation or drop-outs. In areas where frequent degradation or fall-out is encountered, loss of class will result in decreased drilling time, as operation will have to come to a halt and preparations for riser-disconnection may have to be initiated. This has motivated the development of a third position reference system based on measurement of riser angle offsets. In this paper the design principles for such a riser angle position reference system are presented.

Copyright © 2002 by ASME
Topics: Pipeline risers



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