Stability – I : Chapter 10

L                  D

Ship in

Q  10              10000       –     8.954       89540          –         2027. 4

NO1 DB           –           200     1.15          –              230      (-) 399

and so on .

Note – 5: When dealing with several tank’s in a ship calculation such as this the change of KG of tank due to change in its sounding may be ignored. This is the actual practice at sea .

FOR EXAMPLE: When half of the HFO (i.e. 100t from NO3 C is pumped out , the moment of the discharge weight about keel would 100X 0.6 = 60 tm .

Solution:

Ship’s wt	KG	VM	FSM
10000	8.954	89540tm	2087.4
(- ) 200 (dish)	1.15	(-) 230tm	(- )399.0
(- ) 100 (dish)	0.60	(-)60 tm	( +)1140.0
(- ) 200(dish)	0.70	(- )140 tm	(-) 600.0

         Final W = 9500                                                  Final VM=89110tm          Final FSM=  2228.4tn

We know that:
Final KG = (Final VM/ Final W)
Final KG = (89110/9500)
Final KG = 9.38m

Again, FSC = (FSM /W)
= (2228.4 /9500)
= 0.234m

GM Solid   = (KM –KG)
= (9.9 – 9.38)
= 0.52m

GM fluid   = GM (solid) – FSC
= (0.52 – 0.234)
= 0.286m.