A Longer Life for a Better Journey!

A Longer Life for a Better Journey!

Energy CIO Insights | Friday, March 20, 2020

David Knezevic Co Founder & CTO

Since the fall in oil prices in the early 2010s, the life extension of current offshore assets has turned into a multi-billion dollar industry. And the new code check methodology is doing much of it!

FREMONT, CA: “The key we provide is a high fidelity computational replica of the asset, which provides deep insights to understand its current state, and helps make predictions,” said David Knezevic, Co-Founder, and CTO of Akselos.

A code check methodology is supreme for examining the behavior of offshore assets. The method mingles complementary aspects of existing industry-standard codes, covering strength, fatigue limit states, and serviceability. The technique is particularly well-suited to the post-processing of Finite Element (FE) analyses. It permits the additional capacity to be used for safety enhancements and improvements required to extend the platform’s economic life.

Even though code checking both framed and simple structures are usually highly automated, the opposite is exact of complex structures. These structures are commonly seen in the offshore industry and are found in modules, plate girders, semi-submersibles, jack-ups, TLPs, and FPSOs. Nevertheless, offshore assets tolerate harsh conditions over the decade of functioning, which means there can be many uncertainties for both operators and regulators.

The present fatigue checking approach is based on Stress Concentration Factor (SCF), which dates back to the 1980s, is inappropriate due to many uncertain factors during the code checking process. Engineers used a very high safety factor, which led to the shortened lifecycle of assets. The implementation of high safety factor leaves the offshore industry in an uninviting position of balancing stringent safety requirements with the need to expand the asset life. At times, the codes of practice might also lag behind the current provisions of the industry and developments in technology.

Akselos was featured as one of the Top 10 Digital Oil Field Solution Providers of 2018 by Energy CIO Insights. It brings integrated analysis and design capabilities for the entire lifecycle of any complex offshore structure. Akselos’ Utilization code check, developed in collaboration with LIC Engineering, allows the structural compliance of offshore structures to international codes, like such as ISO, API, DNV, and NORSOK or for that matter any other standard according to the customer needs. It also reviews asset abilities with easy to interpret numerical and graphical displays. Akselos has powerful next-gen technology that makes use of pure 3D shell elements at the joints, paired with beam elements elsewhere within a global model. Every joint contains magnificent mesh at hot-spot places such as weld zones associated with DNV-GL RP-C203 standards.

Akselos performs processing combined with the stress transfer functions with wave data from inspections. The approach conveys accurate results in determining the fatigue life of a component without resorting to highly traditional and inherently imprecise stress concentration factors (SCF). Additionally, 3D joints are as fast-solving as 1D Beam with Akselos Reduced-Basis-FEA technology (RB-FEA) so, there is no speed penalty for it. It was believed that there was considerable scope for increasing the asset life in the Shell Operated Asset in the North Sea. The reliability of the structure under the new lifetime has demonstrated the use of detailed Akselos Reduced-Basis-FE analysis and the Fatigue code check methodology. An additional 20 years of the structural fatigue life has now extended as a result. 

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