9.1 The towed object, including cargo and securing
arrangements, should be capable to withstand the loads caused by the
most adverse environmental conditions expected for the season and
areas in question.footnote
9.2 The duration of a towing operation is measured
from the time the operation is started until the tow is in a safe
condition at its arrival location. If there are locations along the
route where the towed object can safely be located, the duration of
the towing operation can be measured between such locations.
9.3 For long duration towing operations passing
through areas having different sea state characteristics, the worst
sea state for the route should be considered when selecting the cargo
securing arrangements and the equipment to ensure watertight integrity
of the towed object.
9.4 The continuous bollard pull of the towing
vessel(s) involved should be sufficient to maintain station keeping
of the tow in the following environmental conditions, acting in the
same direction:
| -
|
Wind:
|
20
m/s
|
| -
|
Significant
wave height:
|
5 m
|
| -
|
Current:
|
0.5
m/s
|
Other criteria may be acceptable if high confidence on the
weather forecasts and experience data for the actual waters can be
obtained.