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Project: TWD-XX-20XX-XXX, Provide project title here Author: - Revision: 0 Checked: - Date: 28-05-
C-001, Barge Stability calculation - FOR DEMO PURPOSES ONLY
1 Introduction
This calculation determines the stability of a barge for a given deck load and ballast configuration according to the code of Intact Ship Stability(IMO 2008).
Figure 1-1, Coordinate system used in this calculation.
Assumptions
- Free surface effect is assumed to be 0 for all tanks filled above 98%.
Abbreviation Meaning APP Aft perpendicular BL Base line CL Centre line FPP Forward perpendicular FSM Free surface moment GM_T Transverse metacentric height KM_T Distance from the transverse metacentric point (M) and the base line (K) LCB Longitudinal centre of buoyancy LCG Longitudinal centre of gravity LCF Longitudinal centre of floatation MCT Moment to change the trim PS Port side SB Starboard TCG Transverse centre of gravity VCG Vertical centre of gravity
2 References
[1] IMO874E - International Code on Intact Stability (2008) [2] Stability booklet for Demo Barge 1
3 Vessel properties
Vessel name Demo Barge 1
Length L = 60.00 m [2]
Breadth moulded B = 22.00 m [2]
Depth D = 4.00 m [2]
Allowable draft Tall = 2.33 m [2]
Lightship weight W = 723.1 t [2]
Lightship longitudinal CoG LCG W = 29.95 m [2]
Lightship transversal CoG T CG W = -0.05 m [2]
Lightship vertical CoG V CG W = 4.00 m [2]
Water properties
Water type - floatation Sea water
Water density - floatation ρw 1 = 1.025 (^) mt 3
Water type - tank filling Sea water
Water density - tank filling ρw 2 = 1.025 (^) mt 3
4 Cargo on deck
no. Cargo Weight LCG TCG VCG [t] [m] [m] [m] 1 Cargo 50 3.0 2.0 1. 2 Cargo 10 10.0 3.0 1. Total 60.0 4.17 2.17 1.
6 Hydrostatic properties
7 Stability verification
Stability criteria (Ref. [1] and Ref. [2]):
(A) The area under the righting lever curve up to the angle of maximum righting lever should not be less than 0.08 meter radians.
(B) The static angle of heel due to a uniformly distributed wind load of 0.54 kPa (wind speed 30 m/s) should not exceed an angle corre- sponding to half the freeboard for the relevant loading condition, where the lever of wind heeling moment is measured from the centroid of the windage area to half draft.
(C) The minimum range of stability should be:
- 20 degrees (if L ≤ 100 m)
- 15 degrees if (L ≥ 150 m)
- by interpolation, for intermediate length
Criteria (A)
Max. allowable VCG V CGall = 40.65 m [2]
Combined VCG (including free surface effect) V CG = V CG 0 = 3.77 m
Is V CG < V CGall Attained
Criteria (B)
Max. allowable VCG V CGall = 55.19 m [2]
Combined VCG (including free surface effect) V CG = V CG 0 = 3.77 m
Is V CG < V CGall Attained
Criteria (C)
Max. allowable VCG V CGall = 23.34 m [2]
