A SHIP HAS SUMMER DRAFT OF
8,15 M AND FRESH WATER ALLOWANCE OF
17 CM. TO
WHAT DRAFT MAY SHE LOAD
IN DOCK WATER OF A DENSITY OF
1,007 ?
ANSWER :
1. ( 1,025 -- Sg
OF DOCK WATER ) * FWA = ( 1,025 --
1,007 ) * 17 = 0,018 *17 = 12,24 CM
( 1,025 -- Sg FRESH WATER )
0,025
= 0,1214 M
2. ALLOWABLE DRAFT AT DOCK WATER = SHIP'S DRAFT + 1. = 8,15 + 0,1224 = 8,2724 M
A SHIP HAS DISPLACEMENT OF
2000 TONNES. FIND THE CHANGE OF HER
CENTRE OF
GRAVITY IF A WEGHT OF 100
TONNES SHIFTED ACROSS HER HOLD 12 METRES
?
ANSWER :
1. WEIGHT * SHIFTING
= 100 * 12 = 0,60 M
DISPLACEMENT
2000
QUESTION 10 :
A WEIGHT OF 550 TONNES IS LOADED
ON A SHIP. THE CG OF THE WEIGHT
IS LOCATED
3 M FROM THAT OF THE SHIP.
IF THE SHIP'S ORIGINAL DISPLACEMENT WAS
3250 TONNES,
WHAT WILL BE THE CHANGE
OF THE CG ?
ANSWER :
550 * 3
= 1650 = 0,434 M
3250 + 550
3800
A SHIP AND HER CARGO DISPLACE
8400 TONNES. IF A WEIGHT OF 120 TONNES
IS REMOVED
FROM A POINT 35 M FROM
THE ORIGINAL CG, WHAT WILL BE
THE CHANGE OF THE CG ?
ANSWER :
120 * 35
= 4200 = 0,51 M
8400 -- 120
8280
QUESTION 12 :
A WEIGHT OF 35 TONNES IS LOADED
INTO A VESSEL. THE NEW DICPLACEMENT IS
2550 T.
THE OLD KG WAS 4,52
M.
WHAT IS THE NEW KG
UNDER THE FOLLOWING CONDITIONS ?
( a ) LOADED 6,2 M ABOVE THE
CG ?
( b ) LOADED 6,2 M BELOW
THE CG ?
ANSWER :
KG = 35 * 6,2
= 0,085 M
2550
( a ) LOADED ABOVE CG =4,52 + 0,08 = 4,60 M ( NEW KG )
( b ) LOADED BELOW CG = 4,52 -- 0,08 = 4,44 M ( NEW KG )
A VESSEL DISPLACED 3250 TONNES,
AND HER KG IS 6,8 M. 150 TONNES
ARE LOADED WITH
THE CG 2,4 M ABOVE THE
KEEL. WHAT IS THE NEW KG ?
ANSWER :
1. (6,8 -- 2,4 )
* 1150 = 4,4 * 1150
= 1,15 M
( 3250 + 1150 )
4400
2. NEW KG
= 6,8 -- 1,15 = 5,65 M
QUESTION 14 :
A DERRICK IS USED TO LIFT
A 12 TONNES WEIGHT FROM THE HOLD. THE
HEADS OF THE
DERRICK IS 15 M ABOVE THE
ORIGINAL CG OF THE WEIGHT. DISPLACEMENT
IS 3200
TONNES. WHAT IS THE SHIFT
OF CG ?
ANSWER :
12 * 15
= 0,056 M UPWARDS
3200
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