GTT inside

GTT Inside, the GTT newsletter

GTT Inside #19 - November 2020


Message from Philippe Berterottière, Chairman & CEO of GTT

Philippe BerterottièreWelcome to this latest issue of GTT Inside.

First of all, GTT would like to share a matter of concern with you.

The Korea Fair Trade Commission (KFTC) has recently issued a decision in which it requests GTT to allow the licensed shipyards, at their request, to perform the technical assistance services, currently included in our technology license.

We consider that providing technical assistance has been since the very beginning the most efficient way to ensure the quality and the proper implementation of our technologies, which, as you know, are very complex. These services are three-fold: (i) design and engineering services, (ii) on-site assistance during construction and (iii) approval of components’ suppliers.

We are convinced that the technical assistance we offer, which incorporates the largest state-of-the-art and return of experience from vessels in service, is unrivaled. The hundreds of deliverables we provide, from the liquid motion studies to the detailed design of the tank, from the structural computation of the pump mast to the optimum sizing of the equipment, from the validation of the materials to the on-site assistance, are very much required and represent an essential and integral part to guarantee safe, reliable and high-performance LNG tanks.

We strongly believe that our current offer complies with Korean fair trade laws and have therefore decided to appeal the KFTC decision.

In the meantime, we will continue to work in close partnership with the shipyards in order to fulfill pending and upcoming orders, providing our partners with ever more innovative, safe and efficient technologies, for the benefit of the entire industry.

Back to GTT Inside :

You will discover in this issue the SLING R&D program aimed at further digging into the phenomena of liquid motion. Such R&D programs are very helpful in the validation of our designs, such as the recently obtained A.I.P. from BV for the NO 96 system for fuel tanks on container vessels. You will also discover that we have proposed an improved design for the nitrogen circuit on NO 96 vessels. And finally, Cryovision offers now SBTT tests.

GTT continue to work to improve the design, constructability and efficiency of our membrane containment systems.

AiP for GTT NO96 technology for ULCV
Bureau Veritas has awarded an Approval in Principle (AiP) for the application of GTT NO96 technology for a LNG fuel tank of an ultra large container vessel.
This adaptation of the NO96 technology, already used in over 200 LNGc, represents a reliable and competitive solution for ULCV fuel tanks. It gives to the historical licensed shipyards, already specialised in NO96 technology, the opportunity to propose the optimal membrane system according to the requirements of the ship-owners.
The challenge of this study was to validate the adequacy of the GTT NO96 technology to the specific structural solicitations of the Container Vessel. Thanks to these results, GTT can now offer to the ship-owners the choice between the two membrane technologies; Mark III and NO96.



New nitrogen pressurization system

After two years of development by the Cargo Handling System design team, GTT can now present the new nitrogen pressurization system Evolution 3 for the NO96 membrane containment systems. Extensive work involving GTT Process & Instrumentation and Stress Piping specialists has been conducted leading to the full acceptance by Daewoo Shipbuilding and Marine Engineering shipyard. Application of the new nitrogen pressurization system on future LNG units equipped with GTT NO 96 membrane containment system such as LNG Carriers, but also FSU/FSRUs and offshore FLNGs can now go forward.

This evolution of the NO96 nitrogen pressurization system was inspired by the Mark III system, a nitrogen pressurization solution that has proved its reliability and efficiency over the years.



Sloshing of LIquefied Natural Gas (SLING)

For many years, GTT has been at the forefront of research into the fundamental behavior of liquid motion (sloshing) of LNG. Besides GTT’s extensive laboratory of sloshing assessment equipment, GTT has been involved in a number of industry research projects. The reader may well remember the Sloshel project, where a very large water flume was used to simulate full-scale sloshing on tank walls.

Now, GTT has teamed up with MARIN and others partners for a new research program; “SLING”.

Overview of the research programme SLING

SLING stands for Sloshing of Liquefied Natural Gas (LNG). This major international cooperative research programme began in 2016 at the instigation of MARIN and GTT. SLING is supported by NWO-TTW, the Dutch Technology Foundation. The remainder of the consortium comprises four top Dutch universities, representatives from the LNG shipping and shipbuilding industry, engineering companies, and research institutes (Fig. 1). Through advanced experiments, numerical simulations, and theoretical modelling, SLING aims to plug the gaps in the knowledge of wave impact loads induced by sloshing in LNG tanks.



CRYOVISION innovates for its services for Vacuum Testing

Since 2012, the operators of CRYOVISION (GTT's first subsidiary) have sailed on more than 150 LNG vessels around the world, thus transforming their position of pioneers into a position of leader for the thermographic control of tanks equipped with membrane technologies.

Today, in order to be able to provide a complete offer to its customers, CRYOVISION has carried out the qualification process to provide SBTT, PBGT, Helium Test and Vacuum Box test services, all known as “vacuum tests”.

With their in-depth knowledge of GTT technologies, CRYOVISION operators are now working to provide these services, at sea, at repair shipyards or at new construction shipyards.