GTT has received two Approvals in Principle (AiP) from Bureau Veritas Marine & Offshore (BV) for its ethane-optimized cargo containment systems: Mark III SlimTM and NO96 Slim TM.
Building on its well-established Mark III and NO96 membrane technologies, GTT has developed these slim variants specifically to accommodate the physical properties of petrochemical cargoes. The optimizations help maximize cargo capacity and optimize construction costs for very large ethane carriers (VLEC) and ultra large ethane carriers (ULEC).
The new systems are also suitable for the transport of LPG, ethylene, butane, propane and propylene.
The key advantages of the Mark III Slim TM and NO96 Slim TM systems include:
- Increased tank capacity: by reducing insulation thickness by 70 mm, usable tank volume is increased by more than 1,000 m³ for an equivalent ship size.
- Lower costs and faster construction: simplified anchoring systems, lighter panels and caissons, and the use of new steel alloys streamline fabrication and reduce shipyard time.
Following a comprehensive review of the documentation submitted by GTT, BV confirmed that the systems are in compliance with the applicable requirements of the IGC Code.
In related news, GTT announces the signing of two Joint Development Projects (JDPs) with HD Hyundai Heavy Industries (HHI), aimed at optimizing membrane-tank integration in LNG carriers to enhance onboard ergonomics and vessels’ operational performance.
The two JDPs will focus on the following areas:
- Convergent trapezoidal cargo tank No. 11: A forward tank concept of convergent trapezoidal form for LNG carriers, fitted with GTT’s Mark III membrane system. This geometry will allow a superior adjustment to the hull compared with conventional constant section tanks, thus optimizing cargo capacity.
- Flush deck liquid dome: A flush deck liquid dome design, located at the interface between the membrane tank and the cryogenic piping. This concept improves trunk-deck ergonomics, simplifies on-board piping, and facilitates maintenance.
Ryu Hong-Ryeul, Head of the Technology Division at HD Hyundai Heavy Industries, said: “We are pleased to be working with GTT on these meaningful projects. Our combined expertise allows us to innovate and refine vessels for optimal energy efficiency and enhance ergonomics, streamlining the supply chain just as demand for LNG carriers continues to grow.”