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5.1. Cargo Containtment System system’s performance, including strength checks for failure
modes associated with yielding, buckling and ultimate strength.
According the IMO classification of Cargo Containment System, This phase is referred to as the Total Strength Assessment
a Floating terminals may use membrane or independent (TSA) and is governed by the criteria.
tanks type for cargo containment system. Classifications of
cargo containment system by IMO are described in Figure 4. The Total Strength Assessment must also consider the interface
between the position mooring system and the hull structure
5.2. General Requirement
and the interface between deck-mounted (or above-deck)
The design criteria for offshore floating liquefied gas terminals equipment modules and the hull structure. The interface
are applicable to floating terminals of 150 meters or more structure is defned as the attachment zone of load transmission
in length. In addition, the applicable criteria contained in between the main hull structure and hull mounted equipment,
the IGC Code and the Load Line and SOLAS Conventions including the position mooring system. The analysis of the hull
issued by the International Maritime Organization are to be interface structure is to be performed using direct calculation
considered. It is further suggested that the local authorities of local 3-D hull interface finite element models. Performance
having jurisdiction where the foating terminal is to operate of additional structural analyses can lead to the granting of
be contacted to obtain any further criteria that are applicable the optional DYLA classification notation, which signifies that
to the foating terminal. The design criteria are applied in two the design meets the Dynamic Load Approach criteria. Also,
phases. In the first phase is Initial Scantling Calculation (ISCAL). the optional SFA classification notation can be granted, which
This Phase specifies the minimum strength requirements for signifes that the design satisfes fatigue strength criteria based
the hull structure with respect to the determination of initial on Spectral Fatigue Analysis. A total strength assessment of
scantlings, including the hull girder, shell and bulkhead plating, the structures, determined on the basis of the initial strength
longitudinals/stiffeners and main supporting members. A criteria in ISCAL is to be carried out in accordance with TSA
second phase requires structural analyses of major portions against the following four failure modes:
of the hull structure to verify the adequacy of the structural

Fig.4 FLNG/FPSO LNG type of loading terminal

52 Jurnal Teknik BKI
Edisi 01 - Juni 2014