. "Appendix I: Salvage Tug Requirements." Reassessment of the Marine Salvage Posture of the United States. Washington, DC: The National Academies Press, 1994.
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A Reassessment of the Marine Salvage Posture of the United States
FIGURE I-9
Tug power estimate required to hold 80-MDWT fully loaded tanker
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
HP
4
30
11
20
31
3
34
20
40
3000
5
35
14
31
45
4
49
22
60
4500
6
40
19
45
64
5
69
24
85
6400
7
45
24
76
100
7
107
26
135
10100
10
50
30
79
109
9
118
28
150
11300
Note: Loss of efficiency is estimate to show effect of motions on effective tug power.
FIGURE I-10
Tug power estimate required to hold 140-MDWT fully loaded tanker.
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
HP
4
30
14
22
36
3
39
20
46
3500
5
35
19
36
55
4
59
22
71
5400
6
40
24
54
78
5
83
24
103
7700
7
45
31
95
126
7
133
26
167
12500
10
50
38
121
159
9
168
28
215
16100
Note: Loss of efficiency is estimate to show effect of motions on effective tug power.
