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A=1.813 (σ_m/^Δσ_A)² ;

σ_m=design primary membrane stress;

^Δσ_A=(allowable dynamic membrane stress for double amplitude at probability level Q=10⁻⁸) 53.9 MPa (7821 psi) for ferritic and martensitic steels and 24.5 MPa (3555 psi) for 5083–0 aluminum;

C=a characteristic tank dimension that is the greatest of h, 0.75b, or 0.45 l;

where:

h=the height of the tank or the dimension in the vessel's vertical direction, in meters;

b=the width of the tank or the dimension in the vessel's transverse direction; in meters; and

l=the length of the tank or the dimension in the vessel's longitudinal direction, in meters; and

_ρ=the specific gravity of the cargo.