FIGURE I-11

Tug power estimate required to hold 280-MDWT fully loaded VLCC.

Sig. Wave H

Wind Speed

Tanker Resistance

Tug Resist

Minimum Bollard

Est. Loss of Efficiency

Required Bollard

Estimated Tug BHP

Wind

Wave

Total

meters

kn

tons

tons

tons

tons

tons

%

tons

H P

4

30

16

19

35

3

38

20

46

3400

5

35

22

32

54

4

58

22

71

5300

6

40

29

50

79

5

84

24

104

7800

7

45

36

94

130

7

137

26

173

13000

10

50

45

159

204

9

213

28

272

20400

Note: Loss of efficiency is estimate to show effect of motions on effective tug power.



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