2.1 Time required from commencement of cross-flooding θ
0 to the final equilibrium θf:
2.2 Time required to bring the ship from any angle
of heel θ to the final equilibrium θf
:
2.3 Time required from commencement of cross-flooding θ
0 until any angle of heel θ is
achieved:
2.4 Dimensionless factor of reduction of speed
through an equalization device, being a function of bends, valves,
etc., in the cross-flooding system:
where F is not to be taken as more than
1.
Values for k can be obtained from appendix
2 or other appropriate sources.
2.5 Cross-flooding through successive devices
of different cross-section:
If the same flow crosses successive flooding devices of cross-section
S1, S2, S3… having corresponding
friction coefficients k1, k2, k3…,
then the total k coefficient referred to S1 is:
|
Σ k |
= |
k1 +
k2 · S1
2/S2
2 +
k3 · S1
2/ S3
2…
|
2.6 If different flooding devices are not crossed
by the same volume, each k coefficient should be multiplied by the
square of the ratio of the volume crossing the device and the volume
crossing the reference section (which will be used for the time calculation):
|
Σ k |
= |
k1 +
k2 · S1
2/S2
2 ·
W2
2 / W1
2 + k3 ·
S1
2 / S3
2 · W3
2 / W1
2…
|
2.7 For cross-flooding through devices in parallel
that lead to the same space, equalisation time should be calculated
assuming that:
|
S · F |
= |
S1 ·
F1 + S2 · F2 + …
|
with F = 1/
for each device of cross-section Si