Stability – I : Chapter 4

8. A box –shaped of 2000t displacement is 50m x 10m x 7m. Calculate her RB% in FW

Solution :

Given :- W = 2000t,

 (L x B x H) of box shaped vessel = (50m x 10m x 7m)
 Total volume = 3500m³ 
W = ( u/w volume) x (density)
2000 = (u/w volume) x (1.00)
 u/w volume = 2000 m³

Above water volume = (Total volume) – (u/w volume )
                                       = (3500 – 2000)
                                       =  1500 m³                                                      

RB % = (Above water volume) / (total volume ) x 100
RB % = (1500 /3500)x 100
         = 42.857%

9. The TPC of a ship in SW is 30. Calculate her TPC in FW and in DW of RD1.018.

Solution:

We know that:-
TPC   =   (A / 100) x (density)
30   =      (A / 100) x (1.025)
A =    (30 x 100)/ 1.025
A =  2926.83 m²

TPC in FW can be determined as    = ( 2926.83/ 100)x(1)
=29.268  t/cm.

TPC in DW can be determined as  = (2926.83 / 100) x(1.018)
= 29.79 t/cm.