The Concept of Hybrid Ballast Free Syste PDF
The Concept of Hybrid Ballast Free Syste PDF
The Concept of Hybrid Ballast Free Syste PDF
Hairil Afif, Norul Hidayah, Mohd Zamani Ahmad, Mohd Afifi Abdul Mukti, Adi Maimun Abd Malek, Agoes Priyanto
Department of Marine Technology,
Faculty of Mechanical Engineering,
Universiti Teknologi Malaysia,
Skudai, Johor,
Malaysia.
Email: hairilafif@gmail.com
12
No load, full
ballast H
10 G
Figure 5: Dimension of the tunnels’ transverse section at no.
5 cargo tank F
8
Table 1: The details of ballast free tunnels E D
Draft at LCF, m
C
B flow through the ship‟s hull below ballast draft. However, it has
6 A
been indicated that there are important issues to be taken care
of; the reduced cargo carrying capacity due to the increasing of
double bottom height and the ship‟s depth to cater the loss of
4
cargo carrying capacity. The proposed hybrid ballast free system
Initial should improve the ballast free system. The key strength of the
2
hybrid ballast free system are it fits within the existing space of
Ballasting the conventional ballast tanks without major modification and
adequate to provide the ship‟s draft and trim. Additionally, the
De-ballasting
0 hybridization can be considered as straight forward because it
-3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 11 12 shares the common required equipments such as main ballast
pumps, stripping pumps, discharge overboard and aqueduct.
Trim (+ by stern), m
Additional equipments required are of the shelf types such as
valves for the tunnels.
Figure 7: Draft and trim capability of hybrid ballast free
system with 50% of consumable load onboard
REFERENCES
DISCUSSION Armstrong, G., (1997), “Ballast System Design for Flow-
Through Exchange of Ballast Water”, Trans IMarE, Vol
There are two longitudinal structural tunnels located on each 109, Part 3, pp. 257-269.
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