Stability – I : Chapter 6

10. A ship’s derrick, whose head is 22m above the keel, is used to be discharge a weight of 20 tonnes (KG 5m), lying on the centre line. If the vessel’s displacement and KG before discharging were 6000 tonnes and 8m. Calculate the KG

    1. As soon as the derrick lifts the weight and

    2. After discharging .

Solution:-

Given:-
Weight = 6000t,
Original KG = 8m,
Cargo discharged = 20t,
KG of cargo discharged = 5m
Height of the derrick = 22m

Case – 1

Ship’s weight	KG	VM
6000t	8m	48 000 tm
20t	17m	(+) 340 tm

Final W = 6000                                  Final VM    48340 tm

We know that:

Final KG        =        (Final VM / Final Weight)
Final KG = (48340 / 6,000)
= 8.056m