Full Content is available to subscribers

Subscribe/Learn More  >

Exploring Potential of Towing Pipeline in Emergency Scenarios

[+] Author Affiliations
Vinod Puthiyaparambath, Praveen Kumar, Manoj John, Alexander Stanley

McDermott Middle East, Inc., Dubai, UAE

Paper No. OMAE2015-41254, pp. V05BT04A030; 8 pages
  • ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 5B: Pipeline and Riser Technology
  • St. John’s, Newfoundland, Canada, May 31–June 5, 2015
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-5652-9
  • Copyright © 2015 by ASME


Subsea pipelines-deemed as the safest and most efficient means for transporting hydrocarbons, their integrity and long term maintenance are among the highest priorities for the oil and gas industry. These assets have a design life and are susceptible to damage from various factors during its operation. Operators should have in place a comprehensive Emergency Pipeline Repair System (EPRS). The EPRS should entail rigorous measures to minimize loss of production, the potential consequences of catastrophes and adverse effects on environment in case of an unforeseen event such as pipeline rupture or spill. The system should ensure swift response to restore the mechanical integrity of a damaged section whilst maintaining high HSE standards and minimizing the production shutdown-time duration. Accidental damages call for remedial response actions on an emergency basis. Considering short lengths of pipeline to be replaced, tow technique can offer an effective alternative to the time consuming and expensive conventional pipe-lay barge operations.

An installation method constituting the tow technique is proposed as a part of EPRS to replace damaged section of an operational pipeline. The paper discusses the applicable scenarios, the installation criteria and operational constraints involved in entire set of activities based on the study undertaken. The scenario analyzed involves launching a pre-fabricated pipe string offshore, towing and lay down at repair location. The pipe string is launched from an onshore facility by means of a lead tug, facilitated by rollers placed at designed intervals. The onerous task of pulling the pipe strings through long stretches of shallow water depths emphasizes the need of neutrally buoyant or slight positively buoyant pipe strings. Placing roller supports for the entire stretch is likely to pose several practical and economic constraints. The pipe string is towed to the intended offshore repair location with the assistance of a trailing tug. The pipe strings are laid down at the intended location in a controlled manner by means of winches and sequential release of buoys.

Numerical models of the system for towing and laydown operations are developed and related investigations are undertaken to evaluate the installation parameters, supplementary buoyancy requirements and to assess the criticality at various stages of installation. Further, the limiting weather criteria to carry out the operation are established based on the wave and current imposed hydrodynamic loadings on the strings and several governing parameters. The paper also briefs merits and limitations of the method.

Copyright © 2015 by ASME



Interactive Graphics


Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In