Comparative analysis of reliability methods for determination of the maximum length of free spans of subsea pipelines

Authors: A.S. Avdonkin, Ya.M. Lyubomirov, B.A. Yartsev

Abstract

The article presents the numerical analysis results of the influences of the constant current and liquid particles wave motion speed values, regular wave height, the distance from the sea bottom and the trench burying on the values of the maximum length of a subsea pipeline free span, made with the verification purpose of the empirical correcting factors used in the existing engineering methods. It is shown that the modeling of the hydroelastic interaction between a pipe and the flow must be carried out on the basis of the combined task solution of the turbulent liquid flow around a pipeline and the construction's elastic response. It's been found that under the condition of a single disturbance experienced by a subsea pipeline the empirical methods prove to reliably predict the maximum length of a free span, whereas a combination of two or more disturbing factors affects the prediction accuracy.

Keywords: subsea pipelines, pipeline free spans, the impact sea currents and waves, modeling hydroelastic interaction.


References

1. Recommended Practice DNV-RP-C205 ((Environmental Conditions and Environmental Loads». 2010.
2. Recommended Practice DNV-RP-F105 Free Spanning Pipelines. 2006.
3. Recommended Practice DNV-RP-F109 On-Bottom Stability Design of Submarine Pipelines. 2010.
4. Rules for the Classification and Construction of Subsea Pipelines. Russian maritime register of shipping, 2016. (In Russian)
5. Guidelines on Technical Supervision during Construction and Service of Subsea Pipelines. Russian maritime register of shipping, 2016. (In Russian)

About authors

Andrey Avdonkin - FAI "Russian Maritime Register of Shipping", 8, Dvortsovaya Naberezhnaya, 191186, St. Petersburg, Russia
 
Ya.M. Lyubomirov - FSUE "Krylov State Research Centre", 44, Moskovskoe shosse, 196158, St. Petersburg, Russia

Boris Yartsev - DSc, FSUE "Krylov State Research Centre", 44, Moskovskoe shosse, 196158, St. Petersburg, Russia

Issue: 44/45 (2016)




For citation: A.S. Avdonkin, Ya.M. Lyubomirov, B.A. Yartsev. Comparative analysis of reliability methods for determination of the maximum length of free spans of subsea pipelines. Research Bulletin by Russian Maritime Register of Shipping. 2016, No. 44/45, pp. 96-101.

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UDC:  621.64 (204.1)
Pages:  96-101