ABS has granted extended general design approval for the new membrane-type KC-1 LNG cargo containment system (CCS), which will be installed on new-build LNG carriers currently on order for LNG importer Korea Gas (KOGAS).
KOGAS developed the corrugated membrane-type LNG CCS design concept for the KC-1 CCS in cooperation with DSME, Samsung Heavy Industries and Hyundai Heavy Industries shipyards in South Korea.
ABS Global Korea business development vice-president Dr Hoseong Lee said: “To support the safe emergence of the LNG market, ABS will continue to provide technical support to designers, shipowners and operators to achieve regulatory compliance and operational safety.
“This new membrane-type cargo hold system will be equipped to support the safe storage and transportation of LNG.”
The design is based on the company’s membrane containment system technology that is used for land-based LNG storage tanks.
ABS’s work scope began in 2005 and expanded in 2008 and 2013 to cover additional components and introduce a sloshing evaluation using model tests as part of the structural strength assessment of the new CCS type.
Pump tower design and sloshing analyses of the system have been reviewed in-line with ABS guidance notes on sloshing and structural analysis of LNG pump tower, strength assessment of membrane-type LNG containment systems under sloshing loads, and other applicable industry standards.
Additionally, the company analysed tank and ship motions such as sloshing impact and fatigue loading on an LNG carrier operating in North Atlantic wave conditions.
The KC-1 system will use a 1.5mm-thick corrugated stainless steel 304L membrane as the primary and secondary barriers, and polyurethane foam with 115kg/m³ density as the insulating material. The basic concept is to reduce the effect the hull and primary barrier deformation has on the insulation system.
Membrane containment system technology is being applied to 200,000m³ in-ground LNG storage tanks in the KOGAS Incheon LNG receiving terminal.