An Innovative Approach for On-Bottom Stability Analysis of Subsea Pipelines to Optimize Stabilization Requirements

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An Innovative Approach for On-Bottom Stability Analysis of Subsea Pipelines to Optimize Stabilization Requirements

An Innovative Approach for On-Bottom Stability Analysis of Subsea Pipelines to Optimize Stabilization Requirements
An Innovative Approach for On-Bottom Stability Analysis of Subsea Pipelines to Optimize Stabilization Requirements

Submarine pipelines are externally concrete coated to ensure vertical and lateral stability on seabed without excessive movement. During operation and especially towards late life and beyond, concrete may be lost which must be compensated in the form of stabilization weights. The weight requirements are typically calculated based on concrete thickness calculated during design stage. An alternative approach of “local on-bottom stability analysis” is proposed for each location having concrete coat loss, taking into consideration the relevant input data applicable for the specific location rather than for a pipeline section. Local stability analysis approach considers key input factors such as wave and current data, water depth, embedment and pipe-soil interaction parameters pertinent to explicit location. Local stability analysis has been successfully applied for the assessment of a number of operating subsea pipelines. This paper will present case studies where revised stabilization requirements have been calculated and highlight the associated benefits.


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