Numerical Evaluation of Post-Deck-Flooding IMO Criteria for a Low-Freeboard Harbor Tugboat

Romadhoni Romadhoni; Budhi Santoso; Polaris Nasution

doi:10.12962/j25481479.v10i2.22909

Numerical Evaluation of Post-Deck-Flooding IMO Criteria for a Low-Freeboard Harbor Tugboat

Romadhoni Romadhoni, Budhi Santoso, Polaris Nasution

Abstract

Abstract¾ Low-freeboard harbour tugboats often work in quartering seas where a single boarding wave can leave water sloshing on deck and erode their transverse stability. This paper evaluates how much of that erosion a 28 m tug can tolerate before it breaks the intact-stability limits of IMO MSC 267(85). Using only the vessel’s trim-and-stability booklet, the study superimposes thin sheets of retained water—0 to 0.35 m deep, with drainage coefficients κ = 0.50–0.90—on three loading states: fully laden, half-load and lightship. For every depth and κ pair the corrected righting-arm curve, metacentric height and righting-area reserves are recomputed; a limiting-KG curve and a κ–depth PASS/FAIL heat-map are then produced, and wave data from BMKG (2020–2024) are used to estimate the yearly probability of exceeding the IMO limits. Calculations show that in the full-departure condition the first IMO criterion fails when only 0.12 m of water is trapped at κ = 0.70, whereas the threshold rises to 0.24 m at half-load and 0.31 m in lightship. Lowering κ to 0.55—achievable by higher bulwarks or larger freeing ports—moves the failure boundary rightward by nearly 50 % and cuts the annual exceedance probability below 10⁻³.

Keywords

harbor tugboat; low freeboard; water on deck; intact stability; IMO MSC 267(85); limiting-KG curve; retention coefficient; probabilistic exceedance

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DOI: http://dx.doi.org/10.12962%2Fj25481479.v10i2.22909