Flooding Calculation

*as per BV requirement

a) The total time (in seconds) likely to be required in order to reach and operate the valve closing is to be calculated from the formula:

                        Ta=0.72d+t+300

Where,

d= 55m between the valve control in engine room and the farthest cabin.

t= 0.75s to 30s time necessary to close the concerned valve

                        Ta=0.72d+t+300

                            =0.72 (55) + (30) +300

                            =39.6 + 30 + 300

                           =369.6 s

b)Total flooding time (in seconds) is to be calculated from the formula:

                        Te=0.275+

Where,

V= floodable volume is 178m³ (19% of the total volume where a person may transverse to the valve)

s= Area of full pipe opening

                        Area= πr²

                                 = π (0.06)²

                                                         =0.01131m²

H= 5.25m from pipe fracture to the load line

                        Te=0.275 ×

                          =0.275 ×

                            =0.275 × 6868.75m³

                           =1888 s

“Ta” is to be shorter than “Te”

Ta < Te, the flooding calculation is acceptable.