Ingangsdatum:
01-11-1993
4.2.1
Scope
The provisions given hereunder apply to
decked seagoing fishing vessels as defined in 1.3.4. The stability
criteria given in 4.2.3 and 4.2.4 below should be complied with for all
conditions of loading as specified in 4.2.5, unless the Administration
is satisfied that operating experience justifies departures therefrom.
4.2.2 General precautions
against capsizing
Apart from general precautions referred to
in sections 2.3 and 2.5, the following measures should be considered as
preliminary guidance on matters influencing safety as related to
stability.
.1 all fishing gear and other
large weights should be properly stowed and placed as low as possible;
.2 particular care should be taken
when pull from fishing gear might have a bad effect on stability, e.g.,
when nets are hauled by power-block or the trawl catches obstructions on
the sea-bed;
.3 gear for releasing deck
load in fishing vessels carrying catch on deck, e.g., herring, should be
kept in good working condition for use when necessary;
.4 when the main deck is prepared for
the carriage of deck load by division with pound boards, there should be
slots between them of suitable size to allow easy flow of water to
freeing ports to prevent trapping of water;
.5
fish should never be carried in bulk without first being sure
that the portable divisions in the holds are properly installed;
.6 reliance on automatic steering may
be dangerous as this prevents changes to course which may be needed in
bad weather;
.7 in all conditions of
loading necessary care should be taken to maintain a seaworthy
freeboard.
.8 particular care should be
taken when the pull from fishing gear results in dangerous heel angles.
This may occur when fishing gear fastens onto an underwater obstacle or
when handling fishing gear, particularly on purse seiners, or when one
of the trawl wires tears off. The heel angles caused by the fishing gear
in these situations may be eliminated by employing devices which can
relieve or remove excessive forces applied through the fishing gear.
Such devices should not impose a danger to the vessel through operating
in circumstances other than those for which they were intended.
4.2.3¹ Recommended general
criteria ²
4.2.3.1 The general
intact stability criteria given in section 3.1.2 (paragraphs 3.1.2.1 to
3.1.2.3) should apply to fishing vessels having a length of 24 m and
over, with the exception of requirements on the initial metacentric
height GM
o (paragraph 3.1.2.4) which, for fishing
vessels, should not be less than 0.35 m for single deck vessels. In
vessels with complete superstructure or vessels of 70 m in length and
over the metacentric height may be reduced to the satisfaction of the
Administration but in no case should be less than 0.15 m.
4.2.3.2 The adoption by
individual countries of simplified criteria which apply such basic
stability values to their own types and classes of vessels is recognized
as a practical and valuable method of economically judging the
stability.
4.2.3.3 Where
arrangements other than bilge keels are provided to limit the angle of
roll, the Administration should be satisfied that the stability criteria
referred to in 4.2.3.1 are maintained in all operating conditions.
4.2.4 Severe wind and
rolling criterion (weather criterion) for fishing vessels
4.2.4.1 The Administration
may apply the provisions of 3.2 to fishing vessels of 45 m length and
over.
4.2.4.2 For fishing
vessels in the length range between 24 m and 45 m, the Administration
may apply the provisions of 3.2.
Alternatively the values of
wind pressure (see 3.2.2.2) may be taken from the following table:
| h
(metres) | 1 | 2 | 3 | 4 | 5 | 6 and over |
| P
(N/m²) | 316 | 386 | 429 | 460 | 485 | 504 |
where
h is the vertical distance from the center of the projected vertical
area of the vessel above the waterline, to the waterline.
4.2.5² Loading conditions
to be considered³
4.2.5.1 The
standard loading conditions referred to in 4.2.1 are as follows:
.1 departure conditions for the
fishing grounds with full fuel, stores, ice, fishing gear, etc;
.2 departure from the fishing grounds
with full catch and a percentage of stores, fuel, etc., as agreed by the
Administration;
.3 arrival at home port
with 10% stores, fuel, etc., remaining and full catch;
.4 arrival at home port with 10%
stores, fuel, etc., and a minimum catch, which should normally be 20% of
full catch but may be up 40% provided the Administration is satisfied
that operating patterns justify such a value.
4.2.5.2 Assumptions for
calculating loading conditions should be as follows:
.1 allowance should be made for the
weight of the wet fishing nets and tackle, etc., on deck;
.2 allowance for icing, where this is
anticipated to occur should be made in accordance with the provisions of
section 5.3;
.3 in all cases the cargo
should be assumed to be homogenous unless this is inconsistent with
practice;
.4 in conditions referred to in
4.2.5.1.2 and 4.2.5.1.3 deck cargo should be included if such a practice
is anticipated;
.5 water ballast should
normally only be included if carried in tanks which are specially
provided for this purpose.
4.2.6
Recommendation for an interim simplified stability criterion
for decked fishing vessels under 30 m in length
4.2.6.1 For decked vessels
with a length less than 30 m, the following approximate formula for the
minimum metacentric height GM
min (in metres) for
all operating conditions should be used as the criterion:
GM
min = 0.53+2B [0.075 - 0.37
(f/B)+ 0.82 (f/B)
2 - 0.014 (B/D) -
0.032(l
s/L)]
where:
L is the length of the vessel on the waterline in maximum
load condition (in metres)
l
s is the
actual length of enclosed superstructure extending from side to side of
the vessel (in metres)
B is the extreme breadth of the vessel
on the waterline in maximum load condition (in metres)
D is
the depth of the vessel measured vertically amidships from the base line
to the top of the upper deck at side (in metres)
f is the
smallest freeboard measured vertically from the top of the upper deck at
side to the actual waterline (in metres)
The formula is
applicable for vessels having:
- f/B between 0.02 and
0.20;
- ls/L smaller than 0.60;
- B/D between 1.75 and
2.15;
- sheer fore and aft at least equal to or
exceeding the standard sheer prescribed in regulation 38(8) of
the International Convention on Load Lines, 1966;
- height of superstructure included in the
calculation not less than 1.8 m.
For ships
with parameters outside of the above limits the formula should be
applied with special care.
4.2.6.2
The above formula is not intended as a replacement for the
basic criteria given in 4.2.3 and 4.2.4 but is to be used only if
circumstances are such that cross curves of stability, KM curve and
subsequent GZ curves are not and cannot be made available for judging a
particular vessel's stability.
4.2.6.3
The calculated value of GM
min should be
compared with actual GM values of the vessel in all loading conditions.
If a rolling test (see section 7.6), an inclining experiment based on
estimated displacement or another approximate method of determining the
actual GM is used, a safety margin should be added to the calculated
GM
min
¹ Refer to regulation 44 of the 1966 LL Convention and the 1988
LL Protocol.
² Refer to regulation III/2 of the 1993
Torremolinos Protocol.
³ Refer to regulation III/7 of the
1993 Torremolinos Protocol.
Note:
In paragraph 4.2.3.1, in the second sentence, the word
"it" was inserted after the word "should" with the adoption of res.
MSC.75(69) 14 May 1998. In addition 4.2.4.1 and 4.2.4.1 were
amended.
This resolution was adopted on 4 November
1993.