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SHIP DESIGN I

Freeboard Calculation

Assignment

Divyank Piyush

Roll No. 15

Semester !" NA#S$

C%SA&

MAIN DIMENSIONS

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'$P ())m

$ *5.5m

D 1+.,m

& 1)m

C$ -.+-5

o Deadeight / 0---- tons

o Service Seed / 15.5 knots

o Radius o2 action / +)03 nautical miles

o

Classi2ication Society / 'loyds Register o2Shiing

o Shi Classi2ication / 1--A1$ulk Carrier

o &ye / $ulk Carrier

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Freeboard check

The freeboard is measured downwards from the freeboard deck to

the waterline corresponding to the load line mark. In this case the main

deck is considered as the freeboard. The basic freeboard of a ship

depends on the t!pe of ship and its freeboard length. "ulk carriers fall

under t!pe "#$% where the freeboard re&uired is between t!pe ' and

t!pe ".

B- 60 Freeboard

(reeboard for t!pe "#$% ) (.". of t!pe " *+$%, di-erence of (.". of

" and (.". of ' The re&uired freeboard is obtained b! appl!ing corrections

to the tabular freeboard.

's speci/ed b! I001 rules corrections are done for de2iations from

standard 2alues of 1" Height of superstructure 03D ratio sheeretc.

(ree board length as de/ned b! I001 the length shall be taken as

the 4$, of the total length on a waterline at a depth of 56, measured

from the top of the keel

Tabular Freeboard

L (m) Type A Type B B 60

76 7%5 7%5

6% 89: 99:

8%% 88:6 87;8

86% 84$5 7:86 78%;

7%% 7$87 :7$9 75;:

76% :%87 9%85 :989

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:%% :7$7 9$:% :5%4

Tabular Free board = Freeboard for type B60! d"ffere#ce of freeboard of type B a#d

A

4 )++- 3- 6 7)++- 8(0*39:1-- 4 )++- 53-.*

$%&' Type A%&&' Type B%&&' Type B-60%&&'

()0.00 (0*3 )++- ))10.3

(' )orrect"o# for Block )oeff"c"e#t %)B'

!2 C$-.+5 ; -.3+" correction is needed.

$asic Freeboard 4 tabular 2reeboard "

?here C$-.+5

C$-.+5 4 1.-) C$

4 1.-)-.+-5

4 -.+(0

Since C$-.+5

; -.3+" correction is re@uired.Corrected Freeboard 4 ))10.3

4 )3+5.,)( mm

*')orrect"o# for Depth

!2 D ; ':15"

Correction 2or F.$ 4 7D ':159 R 7mm9

R 4 (5- i2 ' ;1(-m

D 4 1+.,(

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' 4 ())m

':15 4 15.5)

Freeboard correction 4 71+.,( ()):159(5-

4 ,03.33, mm

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+' )orrect"o# for ,heer

The ship has no sheer. Hence correction is applied for sheer

de/cienc!. This means that freeboard is to be increased.

Correction 2or sheer 4 7-.,5 :('9 7*.130'=1(59 7mm9

?here 4 length o2 suerstructure4-.15' 4 )*.05m

Correction 2or sheer4 8,*-.-5,) mm

' )orrect"o# for ,uper,tructure

If length of superstructure is same as the length of the ship a

deduction of freeboard of 8%;% mm is permitted for ships with 0 < 877m.

$ut 'SS4 -.15 '

!2 suerstructure is artial the deduction o2 2reeboard is given in the table (.1).

E 0.1L 0.2L 0.1L 0.2LDeduction 7% 14% 6.30% 12.70%

Type A Type B

&able (.1)

(or E ) %.860 0inear interpolation gi2es a deduction of 8%.6,

and 4.6, for t!pe ' and t!pe " ships respecti2el!

For $83- shis" deduction 4 B&ye $83- di22erence o2 $ and A

4 1-.5 7-.3 19 4 0.0

Freeboard correction 4 81-,--.-00 4 81-5.0)mm

Corrected 2reeboard 4 tabular 2reeboard = 7C$= Deth=

Sheer = Suerstructure9 corrections

Corrected 2reeboard 4 )33.1)( = ))10.3 =,03 = ,*-.-5 1-5.0)

Re@uired Freeboard 4 5113.5(3) mm

Available 2reeboard 4 5.,*m

6cess Freeboard 4 5.,* 5.1135

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4 -3()*,m

Since a2ailable freeboard is greater than the re&uired freeboard

freeboard re&uirement is satis/ed.