Application of concrete coating on rigid pipelines alters the stiffness of the pipeline. Estimation of the effective stiffness of the concrete coated pipe is challenging as it depends on the diameter and thickness of the pipeline, thickness of the concrete coating, the corrosion coating and the cut back lengths.
Realistic estimation of the stiffness is essential in order to define the pipelay profile and for the estimation of pipeline stresses, which in turn governs the limiting weather window for the installation. This paper describes the effect of concrete stiffness of the rigid pipeline using three different methods of stiffness calculation, namely Mogbo, Lund and DNV methods.
Comparison of results from each of the method is presented with the aim of choosing the appropriate method for installation. The objective of this paper is to provide a better insight into the significant operational and economic influences these alternative approaches can have during the installation campaign.