Stability – I : Chapter 3

9. A box – shaped vessel of 18450 t displacement in 150m long and 20 m wide. Find its draft in SW.

     Solution:

We know that:

Displacement =   (U/w volume)x  (density)
18450  =    ( 150 x 20x D) x (1.025)
D       =    ( 18450 ) / ( 150 x 20 x 1.025)
Draft  = 6m

10. A box-shaped vessel 120m long and 15m wide is floating in DW of RD 1.005 at a draft of 5m. if her maximum permissible draft in SW in 6m , find how much cargo she can now load .

Solution:

Area of box shape vessel = (Lx b)
= 120 x 15m,
RD = 1.005, Draft =5m
Mass     = (u/w volume ) x (density)
= (120 x 15 x 5) x (1.005)
= 9045t .

Maximum cargo she can load = (120 x 15 x 6) x (1.025)= 11070 t

Cargo can be load = (11070 – 9045)
= 2025t.