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Floating Concrete Barge Assessment and Inspection Plan: N’Kossa Case Study, a Large Pre-Stressed Concrete Floating Production Unit in Operation in Congo

[+] Author Affiliations
Pascal Collet

TOTAL S.A., Paris, France

Nicolas Vaucquelin

TOTAL EP CONGO, Pointe Noire, Congo

Arnaud Bury


Paper No. OMAE2014-24105, pp. V04BT02A017; 6 pages
  • ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 4B: Structures, Safety and Reliability
  • San Francisco, California, USA, June 8–13, 2014
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4543-1
  • Copyright © 2014 by ASME


The paper describes the way a large pre-stressed concrete Floating Production Unit (FPU) located offshore Congo on N’KOSSA field has been inspected and assessed in order to meet both Bureau Veritas Class and Floating Units Integrity Management System (FUIMS) requirements.

This FPU is the largest existing pre-stressed concrete barge. She was built with high performance concrete, installed offshore in 1996 in 170 m water depth. She has now accumulated 18 years of production.

A significant part of the methodology is based on close inspection for the concrete structure, a graphic assessment of the defects and an implementation of monitoring.

This assessment is done a long time after construction and we had to cope with difficulties relative to the structure size, loss of data, barge in operations off-shore. It gives a good feedback of what we should implement during the design and the construction to keep a clear view of the concrete barge integrity.

Copyright © 2014 by ASME



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