Page 26: of Maritime Reporter Magazine (October 2015)

MARINE DESIGN: LNG CONTAINMENT with any other system. Figure 2 gives isometric views of the CDTS and its in- stallation in a ship.

The comparison of tank outlines are shown in Figure 3 for the spherical, spherical extended, membrane, SPB and

CDTS tanks of equal volume. Table I shows the capacity bene? t of the CDTS over the other containment systems for the same Length Overall (LOA) of 300 m and within the new Panama Canal beam

Figure 2: restriction of 49 m. The spherical extend-

Isometric ed tank would enable the LNG Capacity

Views of to increase to 180,000 m3 within the 300 m LOA and 49 m Beam restrictions. Note

CDTS that the pure spherical tank LNG Carrier would have a beam of 52 m and that the largest total spherical LNG Carrier capac- ity for the new Panama Canal would be 155,000 m3 compared to the CDTS LNG

Capacity of 210,000 m3.

Figure 4 shows a conceptual design for a 210,000 m3 LNG Carrier with the CDTS

Altair ProductDesign provided the structural design expertise and technology that was used to complete the develop- ment of the CDTS design, and enabled the

Approval-In-Principle (AIP) from ABS.

Altair’s HyperWorks Suite of software was used to ideate design solutions, and subsequently to analyze and optimize the

CDTS tank. Altair’s HyperWorks suite is a computer-aided engineering (CAE) sim- ulation software platform that allows busi- nesses to create superior, market-leading products ef? ciently and cost effectively.

The HyperWorks platform offers model-

Figure 3: ing, visualization as well as ideation, anal-

Comparison of Outlines for the Five Containment Systems for Equal Volume ysis & optimization solutions.

Although the constituent parts, of the

CDTS comprise of simple shapes, the overall geometry is structurally complex with signi? cant design improvement op- portunities. Starting from 2005, the Hy- perWorks suite of advanced structural de- sign, analysis and optimization tools were used to improve the design to meet the structural objectives which could not oth- erwise be attained by the proposed origi- nal design. An earlier paper RAMOO, 2009 describes the ? nite element analysis and optimization of the CDTS as applied for LNG applications. The design tools (software) used included: • Optimization Techniques: Topology

Optimization, Free-Size Optimiza- tion, Size/Gage Optimization • RADIOSS Non Linear Transient

Dynamic Analyses for ALE & SPH analyses to predict sloshing loads • AcuSolve CFD Analyses for Fluid & Heat Transfer analyses • HyperStudy (MDO) was used to

Figure 4: develop the thermal management strategy such as position, locations,

CDTS 210,000 m3 Concept Design for 300 m LOA and 49 m Beam Restriction and volume of LNG spray-in.

26 Maritime Reporter & Engineering News • OCTOBER 2015

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