Relaxation bow height (10-46)
Under regulation 39.3 of the International Convention on Load Lines, 1966 and the 1988 Protocol thereto, the following relaxations of the bow height are permitted for vessels with a national safety certificate.
For these vessels, including pontoons in the condition ‘manned working’, a reduced bow height is allowed under restrictions in
- Sailing area (for the definitions see footnote, to be included on the (exemption) certificate),
- Maximum significant wave height,
According to the following table:
|
Sailing area
|
Matching max significant wave height
|
Permissible reduced bow height1
|
|
≤ 15 miles2
|
≤ 4.0 m.
|
70%
|
|
≤ 5 miles3
|
≤ 2.0 m.
|
50%
|
In the past NSI has granted to some vessels a reduction in bow height, based on maximum wind force according to the table hereunder:
|
Sailing area
|
Max wind force in Beaufort
|
Permissible reduced bow height1
|
|
≤ 15 miles2
|
7 Beaufort
|
70%
|
|
≤ 5 miles3
|
5 Beaufort
|
50%
|
For existing cases this practice can be continued.
1 Permissible reduced bow height
In percentage of the bow height calculated according to ICLL reg. 39.1 and 39.2.
2 Sailing area 15 miles
Coastal waters whereby the offshore distance does not exceed 15 nautical miles and the sailing time from safe harbor or anchorage shall be within 6 hours.
3 Sailing area 5 miles
Coastal waters whereby the offshore distance does not exceed 5 nautical miles and the sailing time from the port of operation, mentioned on the safe manning certificate, shall be within 12 hours and shall not be more than 6 hours from a port of refuge.