Falling Behavior of a Pipe in the Sea

  • T. Shimogo
  • T. Kawashima
Conference paper


To set up a cold water pipe at the OTEC plant, a long pipe floating initially on the sea surface is sent to the sea bottom or vertically suspended in the sea. In this paper, dynamical behavior of a falling pipe in the sea were studied for two methods of setting up. At the first method, a pipe is initially suspended by many floats distributed along the pipe and pulled by a wire rope. One end of the rope is fastened at the shore and the other end is carried by a tugboat. By cutting off the floats in turn from the shore-side or the offshore-side, the pipe is sent to the sea bottom. The maximum bending moment occurred at the pipe, a collision velocity of the pipe with the sea bottom, and a required time to laydown the pipe were examined for various cut off speeds of the floats and various tensions of the rope by a theoretical analysis and a numerical simulation. At the second method, a pipe, which is initially filled with air, is sunk by pouring water into the pipe through an orifice provided at the end of the offshore-side and by discharging air out of the pipe through an orifice provided at the end of the shore-side. In this case, the end of the shore-side is supported by a pinjoint. An inclination of the pipe, a water level in the pipe, a reaction at the supporting end, and a bending moment occurred at the pipe were investigated with the lapse of time by a theory and an experiment. The effects of a pipe length and an orifice area on the falling behavior of the pipe were clarified.


Wire Rope Pipe Length Intake Port Uniform Cross Section Exhaust Port 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Dixen, D.A.; Rutledge, D.R.: Stiffened Catenary Calculations in Pipeline Laying Problem. Trans. ASME., J. Eng. Ind. 90–2 (1968) 153–160.CrossRefGoogle Scholar
  2. 2.
    Dareing, D.W.; Neathery, R.F.: Marine Pipeline Analysis Based on Newton’s Method with an Arctic Application. Trans. ASME., J. Eng. Ind. 92–11 (1970) 827–833.Google Scholar
  3. 3.
    Healey, A.J.; Hall, J.E.: An Analytical Study of Controlled Buoyancy in Laying Deep-Sea Pipelines. Trans. ASME., J. Eng. Ind. 97–2 (1975) 266–273.Google Scholar
  4. 4.
    Kan, W.C.; Healey, A.J.: Finite Element Analysis with the State Variable Transfer Matrix and Geometric Nonlinearity for Marine Pipelines in Subsurface Tow. Trans. ASME., J. Energy Resour. Technol. 103–3 (1981) 26–31.CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Tokyo 1985

Authors and Affiliations

  • T. Shimogo
    • 1
  • T. Kawashima
    • 1
  1. 1.Department of Mechanical Engineering, Faculty of Science and TechnologyKeio UniversityKohoku-ku, Yokohama, 223Japan

Personalised recommendations