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Proposal Joined Industry Project (JIP)

The Joint Industry Project (JIP) aims to verify sloshing forces in partially filled membrane LNG tanks, a crucial enabling technology for offshore LNG developments as demand for liquefied natural gas grows. Sloshing poses significant challenges due to continuous sea action and variable tank fillings. The project involves extensive monitoring, modeling, and real-world validation to address these concerns and ensure safety in upcoming floating production and storage installations. Collaboration among industry experts will drive innovation and establish reliable methodologies for the future.

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Proposal Joined Industry Project (JIP)

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  1. Proposal Joined Industry Project (JIP) Full-scale verification of sloshing forces in membrane LNG tanks Singapore, 31 March 2004

  2. Source: Internet Why new project? . • Demand for LNG grows • the industry is racing to explore new gas fields, prepare production sites and plan new transport infrastructure • part of this development involves floating production and storage installations, with the application of membrane containment systems

  3. Source: Internet Why new project? .. • Membrane containment systems have been used in LNG carriers for decades and have an outstanding safety record • The conditions of planned installations differ, however, from those of present carriers

  4. Why new project? ... • A combination of continuous sea action and partially filled tanks may result in significant sloshing forces on the containment system • In LNG carriers these forces are being minimised by fully filled cargo tanks and (off)loading in sheltered areas • Several Classification Societies approved Membrane Systems for all filling levels

  5. Why new project? .... • Sloshing is a popular research domain what results in many often contradictory results • Extensive discussion within the LNG industry about the issue of partial tank fillings • This discussion, justified or not, reflects the industry concern about this issue • Time for joined clarification and verification

  6. Conclusion . • The verification of sloshing forces in partially filled membrane tanks is considered crucial as an “enabling technology” for offshore LNG developments • Alternative systems are (being) developed • CNG / PNG - Compressed / Pressurised Natural Gas • GTL - gas to fluid • SPG - self supporting stainless steel tank

  7. State of the art . • Present methods to predict sloshing forces use model tests and numerical calculations • Both methods involve uncertainties • the fluid-structure interaction complicates the prediction • Full-scale verification is limited • AZURE project demonstrated feasibility of LNG offshore using membrane technology

  8. Source: Internet Numerical challenges . • modeling of elastic containment system and supporting structure • modelling of 2-phase flow with boiling surface & saturated vapor • error accumulation during long simulations (3 hour) • local pressures badly conditioned • still CPU intensive

  9. Source: Internet & MARIN Testing challenges . • modeling of elastic containment system and supporting structure • modeling of 2-phase flow with boiling surface & saturated vapour • modeling of fluid properties (surface tension) • determination of design pressures (scale effects)

  10. Questions to be answered . • How is the sloshing phenomenon in real LNG tank and real sea conditions? • What are actual ship’s motions when sloshing appears? • What is the associated response of the containment system?

  11. How ? . • Different options have already been investigated • a proper, timely, feasible and affordable verification is: Monitoring of an LNG carrier

  12. Source: Internet Project challenges . • partial tank filling not used • (monitoring of tank top area) • long monitoring campaign • pressure measurement • free surface measurements • low temperature -162°C • data reduction/triggering

  13. Project phases and tasks . • Phase I • sensor development • monitoring system design • ship selection • Phase II • Instrumentation • Monitoring • Verification (high filling) • Extrapolation (law filling)

  14. Ship primary stresses Wave radar Ship motions DGPS Link to DCS Strains in containment system Optional pressure measurement free surface measurement Source: Internet Monitoring .

  15. Source: Internet & MARIN Verification . • Model testing and numerical simulation • Use of measured tank fillings and measured ship motions • Extrapolation to different tank fillings

  16. Steering Committee (Chairman) Participants Project Manager - MARIN Task 1 Task 2 Task 3 Task 4 Task 5 Phase II Phase I WG 1 - Sensors WG 2 - System design and approval WG 3 - Instrumentation WG 4 - Monitoring WG 5 - Verification & Extrapolation Project Organization

  17. What next? . • Publicity • Collecting JIP partners • Kick off meeting • JIP proposal, agreement & subsidy • Collecting JIP participants • Start Phase 1

  18. Project data .. • Start Phase I - 2004 • Project duration 4 years • Estimated annual fee 45kEuro • Contact person Mirek Kaminski • m.kaminski@marin.nl • +31 317 493 238

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