New Sloshing Analysis Methodology for FLNG
The results are to offer the industry a new methodology to determine critical sloshing conditions more efficiently than in the past and the methodology promises to be valuable in reducing the cost and time duration for sloshing test campaigns.
Designing for sloshing impact loads is a key concern in tank containment system design. As the cargo tanks have increased in size along with various filling conditions for offshore FLNG operations, the possibility of severe sloshing becomes more likely as well as the probability of structural damage to the containment system. The new ABS-DSME methodology is being proposed as a pre-screening procedure for selecting the most severe critical sea states before the start of a sloshing model test or sloshing flow simulation.
As per ABS the validation is based on extensive sloshing model test data developed from a joint industry project (JIP) by DSME using Gas Transport & Technigaz (GTT NO 96) membrane containment system for an FLNG with a two-row cargo tank with centerline cofferdam arrangement. ABS was a participant in this two-row JIP along with other class societies and energy majors.
This new advanced numerical approach will join other methods of sloshing assessment developed over the past decade such as sloshing flow simulation techniques, scaling laws, fluid-structure interaction, corrugation effects on sloshing and partial filling operation. Associated software to carry out the sloshing methodology for site specific offshore FLNG application is expected to be available in May.
