Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
CLADDED PIPES RESIDUAL STRESS ANALYSIS
Submission Author:
Paulo Pedro Kenedi , RJ , Brazil
Co-Authors:
Gustavo Borcard da Silva, Pedro Martins, Rodrigo Braga da silva, Leticia Campos, Paulo Pedro Kenedi
Presenter: Rodrigo Braga da silva
doi://10.26678/ABCM.COBEM2021.COB2021-0962
Abstract
The Brazilian Pre-Salt reservoirs are located in ultra-deep depth and contain a quite corrosive petroleum. To exploit it, severe requirements against corrosion must be implemented to protect the production structures. For instance, cladding the internal riser surface with a corrosion resistant material, as Inconel 625, is widely used in the offshore industry. Although it is a corrosion resistance layer, it also plays a part in the load share, of the imposed bending moments, with the steel pipe. The cladded riser is reeled to be transported, inducing a considerable yielding of the rigid cladded riser cross sections. As the ship arrives to the launch point, the rigid riser is unreeled, allowing the spring back of this component. As a result, residual stress distributions, for both, steel pipe and cladded layer, arise. The proposed analytical model analyses the sharing load between both components, steel pipe and cladded layer, during the reeling and unreeling of a rigid cladded riser and the consequent cross section residual stress distribution formation. A comparative analysis, for specific geometry of commercial cladded risers, between the residual stresses on the outer diameter and on the elastoplastic border was implemented.
Keywords
cladded pipes, residual stress, analytical model
