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Free Board

This document provides calculations to determine the minimum bow height, summer freeboard, and fresh water freeboard for a vessel with the following specifications: - Length (L): 150.3 m - Breadth (B): 27.7 m - Depth at forward perpendicular (d1): 9.775 m It calculates the minimum bow height as 5330.02 mm. The minimum summer freeboard is determined to be 3092.45 mm. The minimum fresh water freeboard is calculated as 1526.332 mm.

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Ian Stefanus
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445 views4 pages

Free Board

This document provides calculations to determine the minimum bow height, summer freeboard, and fresh water freeboard for a vessel with the following specifications: - Length (L): 150.3 m - Breadth (B): 27.7 m - Depth at forward perpendicular (d1): 9.775 m It calculates the minimum bow height as 5330.02 mm. The minimum summer freeboard is determined to be 3092.45 mm. The minimum fresh water freeboard is calculated as 1526.332 mm.

Uploaded by

Ian Stefanus
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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11.

Minimum bow height and reserve buoyancy (Annex I, regulation 39)


The bow height (Fb), shall be not less than :

Fb = (6075( L / 100) 1875( L / 100) 2 + 200( L / 100) 3 ) x(2.08 + 0.609Cb 1.603C wf 0.0129(L / d1 )
where :
Fb = minimum bow height, in milimetres
L = 150.30
m
B = 27.70
m
d1 = 9.775
m
Cb = 0.843
Cwf = waterplane area coefficient forward of L/2
Awf
C wf =
(L / 2)B
= 1868.680/((150.300/2) x B)
= 0.8977
Awf = waterplane area forward of L/2 at d1
=

1868.680

m2

Then :
Fb =

9130.725
-4235.641875
679.0581054
0.956204931
5330.021333

(6075 x (150.3/100) - 1875 x (150.3/100) ) + 200 x (150.3/100) )


x (2.08 + 0.6090.843-1.603 x 0.898-0.0129 x (150.3/9.775))

Fb =

5330.02

mm

12. Summer freeboard (Annex I, regulation 40)


The minimum freeboard in summer shall be :
Correction for block coeffecient
Correction for depth
Deduction for superstructure and trunk
Correction for Sheer
Minimum freeboard in summer (Fso) =

=
=
=
=

2209.637
373.750
-32.956
542.019
3092.450

Height of Summer freeboard (H)


H = Fso + tFH +hFH
tFH = Sheer height at forward perpendicular
= 0
mm
hFH = Height of forecastle at forward perpendicular
= 3100
mm
H = 3092.450 + 0 + 3100
= 6192.450
mm
Hmin (Fb) = 5330.021
mm
H > Hmin
Freeboard in summer
Fs1 = Fso
= 3092.450
mm
15. Fresh water freeboard (Annex I, regulation 40)
the minimum fresh water shall be obtained :
FW freeboard = Summer Freeboard - /4T
4x
where :
= Displacement at the Summer Load Line
=
23627.090 tonnes
T = TPC at the Summer Load Line
=
37.716 ton/cm
FW freeboard = 309.25-23627.09/(4x37.72)
=
152.633 cm
=
1526.332 mm
16. Result :
The minimum freeboard in
Summer
(S) =
3092.45 mm
Fresh water (FW) = 1526.332 mm
DECK

FW

T
S
W
WNA

603C wf 0.0129(L / d1 )

mm
mm
mm
mm
mm

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