Page 57 - Practical Design Ships and Floating Structures
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t; 1.08
6 1.06
a 1.04
2 1.02
1.00
0.98
0 50 100
Ratio of higher
tensile strenfih
stee!(%)
Figure 1 : Influence of application of higher tensile strength steel
3 MAINTENANCE COST
Maintenance costs are influenced by the management policies of ship owners. Consequently the ship
ages vary from 10 and several years to more than 20 years. Here age of 20 years is taken as standard
life length.
3. I Inspection
By IMO rules every ship classification society makes close up survey. In order to make this easier the
inspection stages are installed in the double hull of VLCC, as shown in Figure 2. Using these stages
close up survey is made in every part of structures.
Figure 2: Maintenance stages in double hull of VLCC
