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A heavy lift derrick , whose head is 20m above the keel , is to shift a locomotive weighing 300 tonnes from the UD (KG 8m ) to the LH (KG 2m). If the displacement and initial KG of the vessel were 12000 tonnes and 7.6m, find the KG of the vessels
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When the derrick has taken the weight off the UD and
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After shifting is over.
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Solution:
Given:
Weight = 12000t,
Initial KG =7.6m,
Cargo shifted = 300t,
Change of KG = (8 – 2)
= 6m downwards
Derrick Height = 20m,
KG of the Weight = 8m
(since the weight is on the UD)
Case – 1
Ship’s weight |
KG |
VM |
| 12000 t | 7.6m | 91200tm |
| 300t (shift) | 12m | (+) 3600 tm |
Final W =12000 t Final VM =94800tm
We know that:
Final KG = (Final VM / Final Weight)
FKG = (94800 / 12000)
= 7.9m
