Page 60 - Practical Design Ships and Floating Structures

35
107%
5 106%
2 105%
0 -C Ordinary
w 104% painting
u
-.
103%
$ 102% +Heavy duty
painting
8 101%
l0M
0 5 10 15 20
AGE OF SHIP
Figure 5: Comparison of life cycle cost by painting cost

5 CONCLUSIONS
In this paper main items of fabrication cost and maintenance cost of a ship are analyzed and studied,
based on the actual data from shipyards and ship owners.

From these studies the following conclusions are obtained.
(1) Material cost occupies 60 % of building cost. Although basic design cost occupies
0.3 %, it decides 90 % of total building cost.
(2) By increasing the application ratio of higher tensile strength steel hm 23 % to 80 % of hull
structural steel, total steel weight is reduced by about 6 % and building cost is reduced by about 1 %.
(3) Life cycle cost should be taken into account in shipbuilding and ship management.
(4) For good maintenance of ships corrosion protection by painting is very important.
By applying heavy duty painting to VLCC at the building stage the life cycle cost will be reduced by
about 3 %, compared with an ordinarily painted one.

Reference
KAUI KYOKAI . (1995), Guideline for Total Lye Assessment of Ships and Offshore Structures