Session: 04-01-07 Flexible Pipes & Umbilicals VII

Paper Number: 121907

121907 - Evaluation of the Inner Liner Part in Unbounded Flexible Pipelines in the Sealing System of End-Fitting 

Place Unbonded flexible pipelines are widely used in the offshore oil and gas industry due to their numerous structural configurations and their adaptability to different environmental requirements. However, designing the end-fitting for connecting these pipes to the floating structure is one of the most challenging tasks. This connector has two main functions, ensures sealing of the pipe fluid and transfers the loads from the pipe to the connecting system unit. The flexible pipes consist of many layers including carcass, inner liner, pressure armor, tensile armor, and outer sheath. The main pressure loads are endured by the carcass, and the inner liner plays the most significant part in the sealing system of the end-fitting. The current study assesses this role. The sealing method is based on dividing the termination of risers into two devices; barrier seal that is the mechanical restraint on the polymer barrier, and the seal system that is applied to seal the fluid of riser. Therefore, two leak paths are observed; between the barrier seal and the polymer barrier, as well as, between the barrier seal and the body. Consequently, to improve the metal seal ring under high pressure, the compression on the polymer barrier should be enough. Besides, the contact pressure at the metal to the metal interface has to be adequate.

Presenting Author: Mohsen Saneian Zhejiang University

Presenting Author Biography: I was born on 1991/07/25 in Esfahan, Isfahan, Iran. I could have been accepted in one of the state universities of Iran (Malayer University, Hamedan) in 2009 and I became a civil engineer, but I wanted to be more than a simple engineer. Therefore, I decided to study more in a specific program. I entered a high-level state university of Iran (Shahid Beheshti University, Tehran) in 2016 this time, and graduated with a G.P.A. of 18.50/20. During my master’s studies, I focused on structural engineering and worked on vulnerability assessment of structures and providing simple refinement solutions. As a matter of fact, I predominantly studied Damage Models of Structures, and I learned more about nonlinear analysis of steel and composite structures subjected to moderate and intense dynamic loadings. I also have a background in finite element analysis of structures. I got the Chinese Government Scholarship and started my Ph.D. in structural engineering major from September 2018 at one of the best universities in the world (#54 in QS ranking), Zhejiang University. Then, concentrating on offshore structures, I have worked and studied new methods, including the designing of the end-fitting for deep-water risers, analysis of the behavior of umbilical cables under different loading conditions, obtaining a new model for the fracture response of the steel pipes under combined loading, programming by MATLAB software and developing existent theoretical models with 3D FE method by ABAQUS software. In addition, I am familiar with some engineering software such as GIS (Certification from Tehran Technical and Vocational Training Organization), ETABS (Certification from the Isfahan University of Technology), SAFE, and SAP200. I have some related work experience, as well. I am a qualified executive and have been supervised structure engineer by the Isfahan Construction Engineering Organization since 2017. Likewise, I was a teacher for two years (2014-2016) in the subject of civil engineering at Khayam High School (Chermahin, Lenjan, Isfahan). I published two papers in OMAE 2019, “Analysis of Subsea Umbilical Mechanical Behavior under Simultaneous Bending, Tension and Torsion” as well as “Assessment of the Carcass Role in Designing Deepwater Riser Connectors”. I also published two Q1 SCi papers in Thin-Walled Structures Journal, “Fracture Response of Offshore Pipelines under Tension and Bending” as well as “Fracture Response of Offshore Pipelines under Tension and Torsion”.

Authors:

Mohsen Saneian Zhejiang University
Yong Bai Zhejiang university