Appendix 3 - Example Using Figures for a Passenger Ship
Clasification Society 2023 - Version 9.38
Statutory Documents - IMO Publications and Documents - Resolutions - Maritime Safety Committee - Resolution MSC.245(83) - Recommendation on a Standard Method for Evaluating Cross-flooding Arrangements - (Adopted on 12 October 2007) - Annex - Recommendation on a Standard Method for Evaluating Cross-flooding Arrangements - Appendix 3 - Example Using Figures for a Passenger Ship

Appendix 3 - Example Using Figures for a Passenger Ship

 Dimension of the considered cross-flooding pipe:

Diameter D = 0.39 m
Length l = 21.0 m
Cross-section area S = 0.12 m 2
Wall thickness t = 17.5 mm

 k-values for the considered cross-flooding system:

Inlet   0.45
Pipe friction   1.08
2 radius bends (α = 45 )   0.36
Non-return valve   0.50
Outlet   1.00
  Σk = 3.39

 Sufficient air venting is assumed to be in place.

 From this follows:

 Time required from commencement of cross flooding θ 0 to the final equilibrium condition θf :

 Head of water before commencement of cross-flooding:

H 0 = 5.3m

 Volume of water which is used to bring the ship from commencement of cross-flooding to the final equilibrium condition:

Wf = 365m 3

 Final head of water after cross-flooding:

hf = 1.5m
Tf =
Tf = 721s = 12.0min

 Time required to bring the vessel from the maximum allowable angle of heel for final stage of flooding θ to the final equilibrium condition θf :

Tθ =
Maximum allowable angle of heel for final stage of flooding θ = 7
Head of water when the maximum allowable angle of heel for final stage of flooding is achieved H θ = 3.7m
Volume of water which is used to bring the vessel from the maximum allowable angle of heel for final stage of flooding to the final equilibrium condition Wθ = 160m 3
Tθ =
Tθ = 354s = 5.9min

 Time required from commencement of cross-flooding θo until the maximum allowable angle of heel for final stage of flooding θ is achieved:

T = Tf - Tθ = 12.0 min - 5.9 min = 6.1 min

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