Tension and Expansion Analysis of Pipe-in-Pipe Risers: Part A, Theoretical Formulation
EVENT: ISOPE
1 Jul 2013
This paper provides a mathematical model for accurate and efficient calculation of the elongation of each string within a pipe-in-pipe top tensioned riser system due to gravity, pressure and thermal expansions.
The resulting riser system elongation effect is subsequently derived considering the interactions among all riser strings. In the case where a tensioner exists, its nonlinear relationship between tension force and displacement can be captured by using an iterative calculation method. Examples show that the approach is efficient, and this mathematical framework is capable of calculating the riser system tension as well as distributing tension to each string. With the proposed approach, inner riser pipe pretension can be determined efficiently considering load conditions during the life time of the riser system.
Authors
Adam Szucs
Senior Principal Engineer, USA
About
Adam has over 22 years of engineering experience with a variety of offshore riser systems ranging from conceptual design and feasibility to detailed design and installation. He has held several project management and technical leadership roles on a variety of projects, and specialises in top tensioned and freestanding hybrid risers. Adam graduated from Texas A&M University with a Bachelor’s degree in Maritime Systems Engineering.
Ricky Thethi
Global Director, UK
About
Ricky is a Global Director based in 2H's London office having relocated from Houston in 2019 after spending almost 20 years in 2H’s Houston office as part of the management team.
Ricky is responsible for globalising the company’s integrity engineering capability and business across all of its offices in both the oil and gas and offshore wind sectors. One of his current focuses is digital transformation, including the use of machine learning and automation technology to improve the speed and accuracy of structural analysis, integrity monitoring and life extension.
Ricky obtained his degree in civil engineering with first-class honours from the University of Surrey in the UK, and is a fellow and Chartered Marine Engineer of the Institute of Marine Engineering, Science and Technology.
Insights
Kevin Man
Principal Engineer
About
Kevin is a principal engineer with 19 over years’ post-graduate experiences in offshore industry including FEED through detailed design. Experienced in the global finite element analysis of risers (top tension risers, steel catenary risers, steel lazy wave risers, flexible risers) and local FEA. Broad based responsibilities in offshore engineering with experiences in analysis and engineering design of riser systems, hydrodynamics, motion analysis, mooring analysis, strength, fatigue analysis, ECA and structural design.