Ocean Systems Engineering

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Experimental assessment of slamming coefficients for subsea equipment installations

  • Received : 2019.12.11
  • Accepted : 2020.05.08
  • Published : 2020.06.25
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Abstract

Considering the huge demand of several types of subsea equipment, as Christmas Trees, PLEMs (Pipeline End Manifolds), PLETs (Pipeline End Terminations) and manifolds for instance, a critical phase is its installation, especially when the equipment goes down through the water, crossing the splash zone. In this phase, the equipment is subject to slamming loads, which can induce impulsive loads in the installation wires and lead to their rupture. Slamming loads assessment formulation can be found in many references, like the Recommended Practice RP-N103 from DNV-GL (2011), a useful guide to evaluate installation loads. Regarding to the slamming loads, RP-N103 adopt some simplifying assumptions, as considering small dimensions for the equipment in relation to wave length, in order to estimate the slamming coefficient CS used in load estimation. In this article, an experimental investigation based on typical subsea structure dimensions was performed to assess the slamming coefficient evaluation, considering a more specific scenario in terms of application, and some reduction of the slamming coefficient is achieved for higher velocities, with positive impact on operability.

Keywords

Acknowledgement

The authors would like to thank the Petrobras R&D Center for the financial support, especially Mr. Daniel Fonseca de Carvalho e Silva who made available the wave basin tests presented in this article. The TPN team responsible for the tests is also acknowledged, specially Mr. Edgard Borges Malta and Mr. Pedro Cardozo de Mello.

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