A Solution for Wind-Induced Vortex-Shedding Vibration of the Harmony and Heritage Platforms During Transpacific Tow

by B.L. Grundmeier, Exxon Co.,
R.B. Campbell, Exxon Production Research Co.,
B.D. Wesselink, Exxon Production Research Co.,



Abstract: This paper describes the results of an advanced procedure for analyzing wind-induced vortex-shedding vibration (VSV) which was used for the transpacific tows of the Harmony and Heritage platforms. A comparative review of past analysis practices in the offshore industry demonstrates that the advanced procedure is more realistic. Input parameters for this procedure were calibrated to analyses of field observations of VSV motion and damage on platforms and flarebooms. This paper also introduces the vibration damper, a simple and effective suppression device new to the offshore industry. The damper has significant cost and schedule advantages compared to conventional suppression techniques which utilize cable stays or helical strakes. The design criteria used to select the number and type of dampers for about 170 tubulars on each of the Harmony and Heritage jackets is also described.

Copyright holder: Copyright 1989, Offshore Technology Conference

Subject Headings: Cables | Vibration | Damping | Wind forces | Vortex shedding | Industries | Awards and prizes | Comparative studies

 

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