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AMENDMENTS TO THE INTERNATIONAL CONVENTION FOR THE SAFETY OF LIFEAT SEA, 1974
AMENDMENTS TO THE INTERNATIONAL CONVENTION FOR THE SAFETY OF LIFEAT SEA, 1974
[Adopted on 20 November 1981 by Resolution MSC .1 (XLV)] (2) Corridors
Corridors and lobbies.
(3) Accommodation spaces
Spaces as defined in Regulation 3.10, excluding corridors.
(4) Stairways
Interior stairways, lifts and escalators (other than those
wholly contained within the machinery spaces) and enclosures thereto.
In this connexion, a stairway which is enclosed only at
one level shall be regarded as part of the space from which it is not
separated by a fire door.
(5) Service spaces (low risk)
Lockers and store-rooms having areas of less than 2 square
m, drying rooms and laundries.
(6) Machinery spaces of category A
Spaces as defined in Regulation 3.19.
(7) Other machinery spaces
Spaces as defined in Regulation 3.20 excluding machinery
spaces of category A.
(8) Cargo pump rooms
Spaces containing cargo pumps and entrances and trunks to
such spaces.
(9) Service spaces (high risk)
Galleys, pantries containing cooking appliances, paint and
lamp rooms, lockers and store-rooms having an area of 2 square m or more,
workshops other than those forming part of the machinery spaces.
(10) Open decks
Open deck spaces and enclosed promenades having no fire
risk. Air spaces (the space outside superstructures and deckhouses).
3 Continuous "B" class ceilings or linings, in association with the
relevant decks or bulkheads, may be accepted as contributing, wholly or
in part, to the required insulation and integrity of a division.
4 External boundaries which are required in Regulation 57.1 to be of
steel or other equivalent material may be pierced for the fitting of
windows and sidescuttles provided that there is no requirement for such
boundaries to have "A" class integrity elsewhere in these Requirements.
Similarly, in such boundaries which are not required to have "A" class
integrity, doors may be of materials to the satisfaction of the
Administration.
5 Permanent approved gastight lighting enclosures for illuminating
cargo pump rooms may be permitted in bulkheads and decks separating cargo
pump rooms and other spaces provided they are of adequate strength and the
integrity and gastightness of the bulkhead or deck is maintained.
Regulation 59 Venting, purging, gas freeing and ventilation
1 Cargo tank venting
1.1 The venting systems of cargo tanks are to be entirely distinct
from the air pipes of the other compartments of the ship. The arrangements
and position of openings in the cargo tank deck from which emission of
flammable vapours can occur shall be such as to minimize the possibility
of flammable vapours being admitted to enclosed spaces containing a source
of ignition, or collecting in the vicinity of deck machinery and equipment
which may constitute an ignition hazard. In accordance with this general
principle the criteria in paragraphs 1.2 to 1.10 will apply.
1.2 The venting arrangements shall be so designed and operated as to
ensure that neither pressure nor vacuum in cargo tanks shall exceed design
parameters and be such as to provide for:
.1 the flow of the small volumes of vapour, air or inert gas
mixtures caused by thermal variations in a cargo tank in all cases through
pressure/vacuum valves; and
.2 the passage of large volumes of vapour, air or inert gas
mixtures during cargo loading and ballasting, or during discharging.
1.3.1 The venting arrangements in each cargo tank may be independent
or combined with other cargo tanks and may be incorporated into the inert
gas piping.
1.3.2 Where the arrangements are combined with other cargo tanks
either stop valves or other acceptable means shall be provided to isolate
each cargo tank. Where stop valves are fitted, they shall be provided with
locking arrangements which shall be under the control of the responsible
ship's officer. Any isolation must continue to permit the flow caused by
thermal variations in a cargo tank in accordance with paragraph 1.2.1.
1.4 The venting arrangements shall be connected to the top of each
cargo tank and shall be self-draining to the cargo tanks under all normal
conditions of trim and list of the ship. Where it may not be possible to
provide self-draining lines permanent arrangements shall be provided to
drain the vent lines to a cargo tank.
1.5 The venting system shall be provided with devices to prevent the
passage of flame into the cargo tanks. The design, testing and locating of
these devices shall comply with the requirements established by the
Administration which shall contain at least the standards adopted by the
Organization.
1.6 Provision shall be made to guard against liquid rising in the
venting system to a height which would exceed the design head of cargo
tanks. This shall be accomplished by high level alarms or overflow control
systems or other equivalent means, together with gauging devices and cargo
tank filling procedures.
1.7 Openings for pressure release required by paragraph 1.2.1 shall:
.1 have as great a height as is practicable above the cargo tank
deck to obtain maximum dispersal of flammable vapours but in no case less
than 2 m above the cargo tank deck;
.2 be arranged at the furthest distance practicable but not less
than 5 m from the nearest air intakes and openings to enclosed spaces
containing a source of ignition and from deck machinery and equipment
which may constitute an ignition hazard.
1.8 Pressure/vacuum valves required by paragraph 1.2.1 may be provided
with a by-pass arrangement when they are located in a vent main or
masthead riser. Where such an arrangement is provided there shall be
suitable indicators to show whether the by-pass is open or closed.
1.9 Vent outlets for cargo loading, discharging and ballasting
required by paragraph 1.2.2 shall:
.1.1 permit the free flow of vapour mixtures; or
.1.2 permit the throttling of the discharge of the vapour mixtures
to achieve a velocity of not less than 30 m/sec;
.2 be so arranged that the vapour mixture is discharged vertically
upwards;
.3 where the method is by free flow of vapour mixtures, be such
that the outlet shall be not less than 6 m above the cargo tank deck or
fore and aft gangway if situated within 4 m of the gangway and located not
less than 10 m measured horizontally from the nearest air intakes and
openings to enclosed spaces containing a source of ignition and from deck
machinery and equipment which may constitute an ignition hazard;
.4 where the method is by high velocity discharge, be located at a
height not less than 2m above the cargo tank deck and not less than 10 m
measured horizontally from the nearest air intakes and openings to
enclosed spaces containing a source of ignition and from deck machinery
and equipment which may constitute an ignition hazard. These outlets shall
be provided with high velocity devices of an approved type;
.5 be designed on the basis of the maximum designed loading rate
multiplied by a factor of at least 1.25 to take account of gas evolution,
in order to prevent the pressure in any cargo tank from exceeding the
design pressure. The master shall be provided with information regarding
the maximum permissible loading rate for each cargo tank and in the case
of combined venting systems, for each group of cargo tanks.
1.10 In combination carriers, the arrangement to isolate slop tanks
containing oil or oil residues from other cargo tanks shall consist of
blank flanges which will remain in position at all times when cargoes
other than liquid cargoes referred to in Regulation 55.1 are carried.
2 Cargo tank purging and/or gas freeing
Arrangements for purging and/or gas freeing shall be such as to
minimize the hazards due to the dispersal of flammable vapours in the
atmosphere and to flammable mixtures in a cargo tank. Accordingly:
.1 When the ship is provided with an inert gas system the cargo
tanks shall first be purged in accordance with the provisions of
Regulation 62.13 until the concentration of hydrocarbon vapours in the
cargo tanks has been reduced to less than 2 per cent by volume.
Thereafter, venting may be at the cargo tank deck level.
.2 When the ship is not provided with an inert gas system, the
operation shall be such that the flammable vapour is initially discharged:
.2.1 through the vent outlets as specified in paragraph 1.9; or
.2.2 with a vertical exit velocity of at least 20 m/sec through
outlets at least 2 m above the cargo tank deck level and which are
protected by suitable devices to prevent the passage of flame.
When the flammable gas concentration in the outlet has been reduced to
30 per cent of the lower flammable limit the discharge of the gas mixture
may be at the cargo tank deck level.
3 Ventilation
3.1 Cargo pump rooms shall be mechanically ventilated and discharges
from the exhaust fans shall be led to a safe place on the open deck. The
ventilation of these rooms shall have sufficient capacity to minimize the
possibility of accumulation of flammable vapours. The number of changes of
air shall be at least 20 per hour, based upon the gross volume of the
space. The air ducts shall be arranged so that all of the space is
effectively ventilated. The ventilation shall be of the suction type using
fans of the non-sparking type.
3.2 The arrangement of ventilation inlets and outlets and other
deckhouse and superstructure boundary space openings shall be such as to
complement the provisions of paragraph 1. Such vents especially for
machinery spaces shall be situated as far aft as practicable. Due
consideration in this regard should be given when the ship is equipped to
load or discharge at the stern. Sources of ignition such as electrical
equipment shall be so arranged as to avoid an explosion hazard.
3.3 In combination carriers all cargo spaces and any enclosed spaces
adjacent to cargo spaces shall be capable of being mechanically
ventilated. The mechanical ventilation may be provided by portable fans.
An approved fixed gas warning system capable of monitoring flammable
vapours shall be provided in cargo pump rooms and pipe ducts and
cofferdams referred to in Regulation 56.1 adjacent to slop tanks. Suitable
arrangements shall be made to facilitate measurement of flammable vapours
in all other spaces within the cargo tank area. Such measurements shall be
made possible from open deck or easily accessible positions.
Regulation 60 Cargo tank protection
1 For tankers of 20,000 tonnes deadweight and upwards the protection
of the cargo tanks deck area and cargo tanks shall be achieved by a fixed
deck foam system and a fixed inert gas system in accordance with the
requirements of Regulations 61 and 62, except that, in lieu of the above
installations, the Administration, after having given consideration to the
ship's arrangement and equipment, may accept other combinations of fixed
installations if they afford protection equivalent to the above, in
accordance with Regulation I/5.
2 To be considered equivalent, the system proposed in lieu of the deck
foam system shall:
.1 be capable of extinguishing spill fires and also preclude
ignition of spilled oil not yet ignited; and
.2 be capable of combating fires in ruptured tanks.
3 To be considered equivalent, the system proposed in lieu of the
fixed inert gas system shall:
.1 be capable of preventing dangerous accumulations of explosive
mixtures in intact cargo tanks during normal service throughout the
ballast voyage and necessary in-tank operations; and
.2 be so designed as to minimize the risk of ignition from the
generation of static electricity by the system itself.
4 Tankers of 20,000 tonnes deadweight and upwards constructed before 1
September 1984 which are engaged in the trade of carrying crude oil shall
be fitted with an inert gas system, complying with the requirements of
paragraph 1, not later than:
.1 for a tanker of 70,000 tonnes deadweight and upwards 1
September 1984 or the date of delivery of the ship, whichever occurs
later; and
.2 for a tanker of less than 70,000 tonnes deadweight 1 May 1985
or the date of delivery of the ship, whichever occurs later except that
for tankers of less than 40,000 tonnes deadweight not fitted with tank
washing machines having an individual throughput of greater than 60 cubic
m/hour the Administration may exempt such tankers from the requirements of
this paragraph, if it would be unreasonable and impracticable to apply
these requirements, taking into account the ship's design characteristics.
5 Tankers of 40,000 tonnes deadweight and upwards constructed before 1
September 1984 which are engaged in the trade of carrying oil other than
crude oil and any such tanker of 20, 000 tonnes deadweight and upwards
engaged in the trade of carrying oil other than crude oil fitted with tank
washing machines having an individual throughput of greater than 60 cubic
m/ hour shall be fitted with an inert gas system, complying with the
requirements of paragraph 1, not later than:
.1 for a tanker of 70,000 tonnes deadweight and upwards 1
September 1984 or the date of delivery of the ship, whichever occurs
later; and
.2 for a tanker of less than 70,000 tonnes deadweight 1 May 1985
or the date of delivery of the ship, whichever occurs later.
6 All tankers operating with a cargo tank cleaning procedure using
crude oil washing shall be fitted with an inert gas system complying with
the requirements of Regulation 62 and with fixed tank washing machines.
7 All tankers fitted with a fixed inert gas system shall be provided
with a closed ullage system.
8 Tankers of less than 20,000 tonnes deadweight shall be provided with
a deck foam system complying with the requirements of Regulation 61.
Regulation 61 Fixed deck foam systems
1 The arrangements for providing foam shall be capable of delivering
foam to the entire cargo tank area as well as into any cargo tank the deck
of which has been ruptured.
2 The deck foam system shall be capable of simple and rapid operation.
The main control station for the system shall be suitably located outside
the cargo tank area, adjacent to the accommodation spaces and readily
accessible and operable in the event of fire in the areas protected.
3 The rate of supply of foam solution shall be not less than the
greatest of the following:
.1 0.6 l/minute per square metre of cargo deck area, where cargo
deck area means the maximum breadth of the ship multiplied by the total
longitudinal extent of the cargo tank spaces;
.2 6 l/minute per square metre of the horizontal sectional area of
the single tank having the largest such area; or
.3 3 l/minute per square metre of the area protected by the
largest monitor, such area being entirely forward of the monitor, but not
less than 1,250 l/minute.
4 Sufficient foam concentrate shall be supplied to ensure at least 20
minutes of foam generation in tankers fitted with an inert gas
installation or 30 minutes of foam generation in tankers not fitted with
an inert gas installation when using solution rates stipulated in
paragraphs 3.1, 3.2 or 3.3, whichever is the greatest. The foam expansion
ratio (i.e. the ratio of the volume of foam produced to the volume of the
mixture of water and foam-making concentrate supplied) shall not generally
exceed 12 to 1. Where systems essentially produce low expansion foam but
at an expansion ratio slightly in excess of 12 to 1 the quantity of foam
solution available shall be calculated as for 12 to 1 expansion ratio
systems. When medium expansion ratio foam (between 50 to 1 and 150 to 1
expansion ratio) is employed the application rate of the foam and the
capacity of a monitor installation shall be to the satisfaction of the
Administration.
5 Foam from the fixed foam system shall be supplied by means of
monitors and foam applicators. At least 50 per cent of the foam solution
supply rate required in paragraphs 3.1 and 3.2 shall be delivered from
each monitor. On tankers of less than 4,000 tonnes deadweight the
Administration may not require installation of monitors but only
applicators. However, in such a case the capacity of each applicator
shall be at least 25 per cent of the foam solution supply rate required in
paragraphs 3.1 or 3.2.
6.1 The number and position of monitors shall be such as to comply
with paragraph 1. The capacity of any monitor shall be at least 3 l/minute
of foam solution per square metre of deck area protected by that monitor,
such area being entirely forward of the monitor. Such capacity shall be
not less than 1,250 l/minute.
6.2 The distance from the monitor to the farthest extremity of the
protected area forward of that monitor shall not be more than 75 per cent
of the monitor throw in still air conditions.
7 A monitor and hose connexion for a foam applicator shall be situated
both port and starboard at the front of the poop or accommodation spaces
facing the cargo deck. On tankers of less than 4,000 tonnes deadweight a
hose connexion for a foam applicator shall be situated both port and
starboard at the front of the poop or accommodation spaces facing the
cargo deck.
8 Applicators shall be provided to ensure flexibility of action during
fire-fighting operations and to cover areas screened from the monitors.
The capacity of any applicator shall be not less than 400 l and the
applicator throw in still air conditions shall be not less than 15 m. The
number of foam applicators provided shall be not less than four. The
number and disposition of foam main outlets shall be such that foam from
at least two applicators can be directed on to any cargo tank deck area.
9 Valves shall be provided in the foam main, and in the fire main when
this is an integral part of the deck foam system, immediately forward of
any monitor position to isolate damaged sections of those mains.
10 Operation of a deck foam system at its required output shall permit
the simultaneous use of the minimum required number of jets of water at
the required pressure from the fire main.
Regulation 62 Inert gas systems
1 The inert gas system referred to in Regulation 60 shall be designed,
constructed and tested to the satisfaction of the Administration. It
shall be so designed and operated as to render and maintain the atmosphere
of the cargo tanks* non-flammable at all times, except when such tanks are
required to be gas free. In the event that the inert gas system is unable
to meet the operational requirement set out above and it has been assessed
that it is impractical to effect a repair, then cargo discharge,
deballasting and necessary tank cleaning shall only be resumed when the
"emergency conditions" laid down in the Guidelines on Inert Gas Systems**
are complied with.
[* Throughout this Regulation the term "cargo tank" includes also
"slop tanks".]
[** Reference is made to Guidelines for Inert Gas Systems, adopted by
the Maritime Safety Committee at its forty-second session in May 1980
(MSC/Circ. 282).]
2 The system shall be capable of:
.1 inerting empty cargo tanks by reducing the oxygen content of
the atmosphere in each tanks to a level at which combustion cannot be
supported;
.2 maintaining the atmosphere in any part of any cargo tank with
an oxygen content not exceeding 8 per cent by volume and at a positive
pressure at all times in port and at sea except when it is necessary for
such a tank to be gas free;
.3 eliminating the need for air to enter a tank during normal
operations except when it is necessary for such a tank to be gas free;
.4 purging empty cargo tanks of hydrocarbon gas, so that
subsequent gas freeing operations will at no time create a flammable
atmosphere within the tank.
3.1 The system shall be capable of delivering inert gas to the cargo
tanks at a rate of at least 125 per cent of the maximum rate of discharge
capacity of the ship expressed as a volume.
3.2 The system shall be capable of delivering inert gas with an oxygen
content of not more than 5 per cent by volume in the inert gas supply main
to the cargo tanks at any required rate of flow.
4 The inert gas supply may be treated flue gas from main or auxiliary
boilers. The Administration may accept systems using flue gases from one
or more separate gas generators or other sources or any combination
thereof, provided that an equivalent standard of safety is achieved. Such
systems should, as far as practicable, comply with the requirements of
this Regulation. Systems using stored carbon dioxide shall not be
permitted unless the Administration is satisfied that the risk of ignition
from generation of static electricity by the system itself is minimized.
5 Flue gas isolating valves shall be fitted in the inert gas supply
mains between the boiler uptakes and the flue gas scrubber. These valves
shall be provided with indicators to show whether they are open or shut,
and precautions shall be taken to maintain them gastight and keep the
seatings clear of soot. Arrangements shall be made to ensure that boiler
soot blowers cannot be operated when the corresponding flue gas valve is
open.
6.1 A flue gas scrubber shall be fitted which will effectively cool
the volume of gas specified in paragraph 3 and remove solids and sulphur
combustion products. The cooling water arrangements shall be such that an
adequate supply of water will always be available without interfering with
any essential services on the ship. Provision shall also be made for an
alternative supply of cooling water.
6.2 Filters or equivalent devices shall be fitted to minimize the
amount of water carried over to the inert gas blowers.
6.3 The scrubber shall be located aft of all cargo tanks, cargo pump
rooms and cofferdams separating these spaces from machinery spaces of
category A.
7.1 At least two blowers shall be fitted which together shall be
capable of delivering to the cargo tanks at least the volume of gas
required by paragraph 3. In the system with gas generator the
Administration may permit only one blower if that system is capable of
delivering the total volume of gas required by paragraph 3 to the
protected cargo tanks, provided that sufficient spares for the blower and
its prime mover are carried on board to enable any failure of the blower
and its prime mover to be rectified by the ship's crew.
7.2 Two fuel oil pumps shall be fitted to the inert gas generator. The
Administration may permit only one fuel oil pump on condition that
sufficient spares for the fuel oil pump and its prime mover are carried on
board to enable any failure of the fuel oil pump and its prime mover to be
rectified by the ship's crew.
7.3 The inert gas system shall be so designed that the maximum
pressure which it can exert on any cargo tank will not exceed the test
pressure of any cargo tank. Suitable shut-off arrangements shall be
provided on the suction and discharge connexions of each blower.
Arrangements shall be provided to enable the functioning of the inert gas
plant to be stabilized before commencing cargo discharge. If the blowers
are to be use for gas freeing, their air inlets shall be provided with
blanking arrangements.
7.4 The blowers shall be located aft of all cargo tanks, cargo pump
rooms and cofferdams separating these spaces from machinery spaces of
category A.
8.1 Special consideration shall be given to the design and location of
scrubber and blowers with relevant piping and fittings in order to prevent
flue gas leakages into enclosed spaces.
8.2 To permit safe maintenance, an additional water seal or other
effective means of preventing flue gas leakage shall be fitted between the
flue gas isolating valves and scrubber or incorporated in the gas entry to
the scrubber.
9.1 A gas regulating valve shall be fitted in the inert gas supply
main. This valve shall be automatically controlled to close as required in
paragraphs 19.2 and 19.3. It shall also be capable of automatically
regulating the flow of inert gas to the cargo tanks unless means are
provided to automatically control the speed of the inert gas blowers
required in paragraph 7.
9.2 The valve referred to in paragraph 9.1 shall be located at the
forward bulkhead of the forward most gas safe space* through which the
inert gas supply main passes.
[* Gas safe space is a space in which the entry of hydrocarbon gases
would produce hazards with regard to flammability or toxicity.]
10.1 At least two non-return devices, one of which shall be a water
seal, shall be fitted in the inert gas supply main, in order to prevent
the return of hydrocarbon vapour to the machinery space uptakes or to any
gas safe spaces under all normal conditions of trim, list and motion of
the ship. They shall be located between the automatic valve required by
paragraph 9.1 and the aftermost connexion to any cargo tank or cargo
pipeline.
10.2 The devices referred to in paragraph 10.1 shall be located in the
cargo tank area on deck.
10.3 The water seal referred to in paragraph 10.1 shall be capable of
being supplied by two separate pumps, each of which shall be capable of
maintaining an adequate supply at all times.
10.4 The arrangement of the seal and its associated fittings shall be
such that it will prevent backflow of hydrocarbon vapours and will ensure
the proper functioning of the seal under operating conditions.
10.5 Provision shall be made to ensure that the water seal is
protected against freezing, in such a way that the integrity of seal is
not impaired by overheating.
10.6 A water loop or other approved arrangement shall also be fitted
to each associated water supply and drain pipe and each venting or
pressure-sensing pipe leading to gas safe spaces. Means shall be provided
to prevent such loops from being emptied by vacuum.
10.7 The deck water seal and all loop arrangements shall be capable of
preventing return of hydrocarbon vapours at a pressure equal to the test
pressure of the cargo tanks.
10.8 The second device shall be a non-return valve or equivalent
capable of preventing the return of vapours or liquids and fitted forward
of the deck water seal required in paragraph 10.1. It shall be provided
with positive means of closure. As an alternative to positive means of
closure, an additional valve having such means of closure may be provided
forward of the non-return valve to isolate the deck water seal from the
inert gas main to the cargo tanks.
10.9 As an additional safeguard against the possible leakage of
hydrocarbon liquids or vapours back from the deck main, means shall be
provided to permit this section of the line between the valve having
positive means of closure referred to in paragraph 10.8 and the valve
referred to in paragraph 9 to be vented in a safe manner when the first of
these valves is closed.
11.1 The inert gas main may be divided into two or more branches
forward of the non-return devices required by paragraph 10.
11.2.1 The inert gas supply mains shall be fitted with branch piping
leading to each cargo tank. Branch piping for inert gas shall be fitted
with either stop valves or equivalent means of control for isolating each
tank. Where stop valvesare fitted, they shall be provided with locking
arrangements, which shall be under the control of a responsible ship's
officer.
11.2.2 In combination carriers, the arrangement to isolate the slop
tanks containing oil or oil residues from other tanks shall consist of
blank flanges which will remain in position at all times when cargoes
other than oil are being carried except as provided for in the relevant
section of the Guidelines on Inert Gas Systems.
11.3 Means shall be provided to protect cargo tanks against the effect
of overpressure or vacuum caused by thermal variations when the cargo
tanks are isolated from the inert gas mains.
11.4 Piping systems shall be so designed as to prevent the
accumulation of cargo or water in the pipelines under all normal
conditions.
11.5 Suitable arrangements shall be provided to enable the inert gas
main to be connected to an external supply of inert gas.
12 The arrangements for the venting of all vapours displaced from the
cargo tanks during loading and ballasting shall comply with Regulation
59.1 and shall consist of either one or more mast risers, or a number of
high velocity vents. The inert gas supply mains may be used for such
venting.
13 The arrangements for inerting, purging or gas freeing of empty
tanks as required in paragraph 2 shall be to the satisfaction of the
Administration and shall be such that the accumulation of hydrocarbon
vapours in pockets formed by the internal structural members in a tank is
minimized and that:
.1 on individual cargo tanks the gas outlet pipe, if fitted, shall
be positioned as far as practicable from the inert gas/air inlet and in
accordance with Regulation 59.1. The inlet of such outlet pipes may be
located either at deck level or at not more than 1 m above the bottom of
the tank;
.2 the cross sectional area of such gas outlet pipe referred to in
paragraph 13.1 shall be such that an exit velocity of at least 20 m/sec
can be maintained when any three tanks are being simultaneously supplied
with inert gas. Their outlets shall extend not less than 2 m above deck
level;
.3 each gas outlet referred to in paragraph 13.2 shall be fitted
with suitable blanking arrangements;
.4.1 if a connexion is fitted between the inert gas supply mains
and the cargo piping system, arrangements shall be made to ensure an
effective isolation having regard to the large pressure difference which
may exist between the systems. This shall consist of two shut-off valves
with an arrangement to vent the space between the valves in a safe manner
or an arrangement consisting of a spool-piece with associated blanks;
.4.2 the valve separating the inert gas supply main from the cargo
main and which is on the cargo main side shall be a non-return valve with
a positive means of closure.
14.1 One or more pressure-vacuum breaking devices shall be provided on
the inert gas supply main to prevent the cargo tanks from being subject
to:
.1 a positive pressure in excess of the test pressure of the cargo
tank if the cargo were to be loaded at the maximum specified rate and all
other outlets were left shut; or
.2 a negative pressure in excess of 700 mm water gauge if cargo
were to be discharged at the maximum rated capacity of the cargo pumps and
the inert gas blowers were to fail.
14.2 The location and design of the devices referred to in paragraph
14.1 shall be in accordance with Regulation 59.1.
15 Means shall be provided for continuously indicating the temperature
and pressure of the inert gas at the discharge side of the gas blowers,
whenever the gas blowers are operating.
16.1 Instrumentation shall be fitted for continuously indicating and
permanently recording, when the inert gas is being supplied:
.1 the pressure of the inert gas supply mains forward of the
non-return devices required by paragraph 10.1; and
.2 the oxygen content of the inert gas in the inert gas supply
mains on the discharge side of the gas blowers.
16.2 The devices referred to in paragraph 16.1 shall be placed in the
cargo control room where provided. But where no cargo control room is
provided, they shall be placed in a position easily accessible to the
officer in charge of cargo operations.
16.3 In addition, meters shall be fitted:
.1 in the navigating bridge to indicate at all times the pressure
referred to in paragraph 16.1.1 and the pressure in the slop tanks of
combination carriers, whenever those tanks are isolated from the inert gas
supply main; and
.2 in the machinery control room or in the machinery space to
indicate the oxygen content referred to in paragraph 16.1.2.
17 Portable instruments for measuring oxygen and flammable vapour
concentration shall be provided. In addition, suitable arrangement shall
be made on each cargo tank such that the condition of the tank atmosphere
can be determined using these portable instruments.
18 Suitable means shall be provided for the zero and span calibration
of both fixed and portable gas concentration measurement instruments,
referred to in paragraphs 16 and 17.
19.1 Audible and visual alarms shall be provided to indicate:
.1 low water pressure or low water flow rate to the flue gas
scrubber as referred to in paragraph 6.1;
.2 high water level in the flue gas scrubber as referred to in
paragraph 6.1;
.3 high gas temperature as referred to in paragraph 15;
.4 failure of the inert gas blowers referred to in paragraph 7;
.5 oxygen content in excess of 8 per cent by volume as referred to
in paragraph 16.1. 2;
.6 failure of the power supply to the automatic control system for
the gas regulating valve and to the indicating devices as referred to in
paragraphs 9 and 16.1;
.7 low water level in the water seal as referred to in paragraph
10.1;
.8 gas pressure less than 100 mm water gauge as referred to in
paragraph 16.1.1. The alarm arrangement shall be sure as to ensure that
the pressure in slop tanks in combination carriers can be monitored at all
times; and
.9 high gas pressure as referred to in paragraph 16.1.1.
19.2 In the system with gas generators audible and visual alarms shall
be provided in accordance with 19.1.1, 19.1.3, 19.1.5 to 19.1.9 and
additional alarms to indicate:
.1 insufficient fuel oil supply;
.2 failure of the power supply to the generator;
.3 failure of the power supply to the automatic control system for
the generator.
19.3 Automatic shut-down of the inert gas blowers and gas regulating
valve shall be arranged on predetermined limits being reached in respect
of paragraphs 19.1.1, 19.1.2 and 19.1.3.
19.4 Automatic shut-down of the gas regulating valve shall be arranged
in respect of paragraph 19.1.4.
19.5 In respect of paragraph 19.1.5, when the oxygen content of the
inert gas exceeds 8 per cent by volume, immediate action shall be taken to
improve the gas quality. Unless the quality of the gas improves, all cargo
tank operations shall be suspended so as to avoid air being drawn in to
the tanks and the isolation valve referred to in paragraph 10.8 shall be
closed.
19.6 The alarms required in paragraphs 19.1.5, 19.1.6 and 19.1.8 shall
be fitted in the machinery space and cargo control room, where provided,
but in each case in such a position that they are immediately received by
responsible members of the crew.
19.7 In respect of paragraph 19.1.7 the Administration shall be
satisfied as to the maintenance of an adequate reserve of water at all
times and the integrity of the arrangements to permit the automatic
formation of the water seal when the gas flow ceases. The audible and
visual alarm on the low level of water in the water seal shall operate
when the inert gas is not being supplied.
19.8 An audible alarm system independent of that required in paragraph
19.1.8 or automatic shut-down of cargo pumps shall be provided to operate
on predetermined limits of low pressure in the inert gas mains being
reached.
20 Tankers constructed before 1 September 1984 which are required to
have an inert gas system shall at least comply with the requirements of
Regulation 62 of Chapter II-2 of the International Convention for the
Safety of Life at Sea, 1974*. In addition they shall comply with the
requirements of this Regulation, except that:
[* the text as adopted by the International Conference on Safety of
Life at Sea, 1974.]
.1 inert gas systems fitted on board such tankers before 1 June
1981 need not comply with the following paragraphs: 3.2, 6.3, 7.4, 8, 9.2,
10.2, 10.7, 10.9, 11.3, 11.4, 13.2, 13.4.2 and 19.8;
.2 inert gas systems fitted on board such tankers on or after 1
June 1981 need not comply with the following paragraphs: 3.2, 6.3, 7.4 and
13.2.
21 Detailed instruction manuals shall be provided on board, covering
the operations, safety and maintenance requirements and occupational
health hazards relevant to the inert gas system and its application to the
cargo tank system**. The manuals shall include guidance on procedures to
be followed in the event of a fault or failure of the inert gas system.
[** Reference is made to Guidelines for Inert Gas Systems, adopted by
the Maritime Safety Committee at its forty-second session in May 1980
(MSC/Circ. 282).]
Regulation 63 Cargo pump rooms
1 Each cargo pump room shall be provided with one of the following
fixed fire-extinguishing systems operated from a readily accessible
position outside the pump room. Cargo pump rooms should be provided with a
system suitable for machinery spaces of category A.
1.1 Either a carbon dioxide or a halogenated hydrocarbon system
complying with the provisions of Regulation 5 and with the following:
.1 the alarms referred to in Regulation 5.1.6 shall be safe for
use in a flammable cargo vapour/air mixture;
.2 a notice shall be exhibited at the controls stating that due to
the electrostatic ignition hazard, the system is to be used only for fire
extinguishing and not for inerting purposes.
1.2 A high expansion foam system complying with the provisions of
Regulation 9, provided that the foam concentrate supply is suitable for
extinguishing fires involving the cargoes carried.
1.3 A fixed pressure water-spraying system complying with the
provisions of Regulation 10.
2 Where the extinguishing medium used in the cargo pump room system is
also used in systems serving other spaces, the quantity of medium provided
or its delivery rate need not be more than the maximum required for the
largest compartment.
CHAPTER III LIFE-SAVING APPLIANCES, ETC.
Regulation 1 Application
The existing text of sub-paragraph (c) (iii) (2) is replaced by the
following:
(2) Regulations II-2/28.1.5 and II-2/28.1.6; and
Regulation 27 Lifeboats, liferafts and buoyant apparatus
In sub-paragraph (c) (iii), reference to "paragraph (d) of Regulation
1 of Chapter II -1" is amended to read:
Regulation II-1/1.5
In sub-paragraph (c) (vii), the reference to "paragraph (d) of
Regulation 1 of Chapter II-1" is amended to read:
Regulation II-1/1.5
Regulation 30 Lighting for deck, lifeboats, liferafts, etc.
In paragraph (a), the reference to "Regulation 25 of Chapter II-1" is
amended to read:
Regulation II-1/42
Regulation 38 Emergency lighting
The reference to "Regulation 26 of Chapter II-1" is amended to read:
Regulation II-1/43
CHAPTER IV RADIOTELEGRAPHY AND RADIOTELEPHONY
The following new Regulation is added:
Regulation 4-1 VHF radiotelephone installation
(a) Passenger ships irrespective of size and cargo ships of 300 tons
gross tonnage and upwards shall be fitted with a VHF radiotelephone
installation complying with the provisions of Regulation 17.
(b) The provisions of Regulation 17 shall also apply for VHF
radiotelephone installations required by a Contracting Government for all
ships to which Chapter V applies navigating in an area under its
jurisdiction and for which a VHF radiotelephone installation is not made
compulsory by paragraph (a).
Regulation 7 Watches-radiotelephone
The existing text of Regulation 7 is replaced by the following:
(a) Each ship which is fitted with a radiotelephone station in
accordance with Regulation 4 shall, for safety purposes while at sea,
maintain continuous watch on the radiotelephone distress frequency in the
place on board from which the ship is usually navigated, by use of a
radiotelephone distress frequency watch receiver, using a loudspeaker, a
filtered loudspeaker or radiotelephone auto alarm.
(b) Each ship referred to in paragraph (a) shall carry qualified
radiotelephone operators (who may be the master, an officer or a member of
the crew) as follows:
(i) if of 300 tons gross tonnage and upwards but less than 500
tons gross tonnage, at least one operator;
(ii) if of 500 tons gross tonnage and upwards but less than 1,600
tons gross tonnage, at least two operators. If such a ship carries one
radiotelephone operator exclusively employed for duties related to
radiotelephony, a second operator is not obligatory.
(c) Each ship which in accordance with Regulation 3 or Regulation 4 is
fitted with a radiotelegraph station shall, while at sea, maintain
continuous watch on the radiotelephone distress frequency in a place to be
determined by the Administration, by use of a radiotelephone distress
frequency watch receiver, using a loudspeaker, a filtered loudspeaker or
radiotelephone auto alarm.
Regulation 8 Watches-VHF radiotelephone
The existing text of Regulation 8 is replaced by the following:
Each ship which is fitted with a VHF radiotelephone installation in
accordance with Regulation 4-1 shall at sea maintain a continuous
listening watch on the navigating bridge:
(i) on 156.8 MHz (channel 16) when practicable; and/or
(ii) for such periods and on such channels as may be required by
the Contracting Government referred to in Regulation 4-1(b).
Regulation 10 Radiotelegraph installations
The existing text of paragraph (g) is replaced by the following:
(g-1) The main and reserve transmitters shall, when connected to the
main antenna, have a minimum normal range as specified below, that is to
say, they must be capable of transmitting clearly perceptible signals from
ship to ship by day and under normal conditions and circumstances over the
specified ranges. * (Clearly perceptible signals will normally be received
it the R.M.S. value of the field strength at the receiver is at least 50
microvolts per metre.)
[* In the absence of a direct measurement of the field strength the
following data may be used as a guide for approximately determining the
normal range:
A: In the case of antennae other than self-supporting types.
|--------------------
| 1 |
| Normal range in miles | Metre-amperes |
|------------|---------|
| 200 | 128 |
| 175 | 102 |
| 150 | 76 |
| 125 | 58 |
| 100 | 45 |
| 75 | 34 |
|--------------------
1. The product of the distance (in metres) from the highest part of
the antenna to the deepest load water-line and the antenna current (in
amperes).
The values given in the second column of the table correspond to
an average value of the ratio
effective antenna height
------=0.47
maximum antenna height
This ratio varies with local conditions of the antenna and may
vary between about 0.3 and 0.7.
B. In the case of self-supporting transmitting antennae:
|--------------------
| 2 |
| Normal range in miles | Metre-amperes |
|------------|---------|
| 200 | 305 |
| 175 | 215 |
| 150 | 150 |
| 125 | 110 |
| 100 | 85 |
| 75 | 55 |
|--------------------
2. The product of the distance (in metres) from the highest part of
the antenna to the deepest load water-line and the current (in amperes)
measured at the base of the radiation portion of the antenna. The values
given in the second column are based on the propagation curves given in
CCIR Recommendation 368-2 and also the method, experimental results and
calculations in CCIR Report 502-1 and Opinion 43-1. The necessary value of
metre-amperes varies considerably with local conditions of the antenna.]
|-----------------------
| Minimum normal range in miles |
|------------|
| Main transmitter | Reserve transmitter |
|------|------|
| All passenger ships and cargo ships of | |
| 1,600 tons gross tonnage and upwards | |
| 150 | 100 |
| Cargo ships below 1,600 tons gross | |
| tonnage | 100 | 75 |
|-----------------------
(g-2) The radiotelegraph installation shall include facilities for
radiotelephone transmission and reception on the radiotelephone distress
frequency. This requirement may be fulfilled by including such facilities
in the main or reserve installation or other installed equipment. The
transmitter power and receiver sensitivity of the radiotelephony part of
the installation shall comply with Regulation 16(c) (i) and (f)
respectively if that part is fitted after 1 September 1986. For
installations fitted prior to that date, such transmitter power and
receiver sensitivity shall be as determined by the Administration. The
location and other conditions of the radiotelephony facilities required by
this Regulation shall be as determined by the Administration, except when
they form part of the main or reserve radiotelegraph installation.
The existing text of sub-paragraph (h) (iv) is replaced by the
following:
(h) (iv) (1) The radiotelephone transmitting facility required by
paragraph (g-2) shall be fitted with an automatic device for generating
the radiotelephone alarm signal, so designed as to prevent actuation by
mistake, and complying with the requirements of Regulation 16(e). The
device shall be capable of being taken out of operation at any time in
order to permit the immediate transmission of a distress message. For
installations fitted prior to 1 September 1986, the fitting of automatic
devices for generating the radiotelephone alarm signal shall be as
determined by the Administration.
(2) Arrangements shall be made to check periodically the
proper functioning of the automatic device for generating the
radiotelephone alarm signal on frequencies other than the radiotelephone
distress frequency using a suitable artificial antenna. An exception shall
be made for radiotelephone emergency equipment having only the
radiotelephone distress frequency in which case a suitable artificial
antenna shall be employed.
Note: While all reasonable steps shall be taken to maintain
the apparatus in an efficient condition, malfunction of the radiotelephone
transmitting facilities required by this Regulation shall not be
considered as making the ship unseaworthy or as a reason for delaying the
ship in ports where repair facilities are not readily available.
The existing text of sub-paragraph (l) (ii) is deleted.
The existing text of sub-paragraph (m) (iv) is replaced by the
following:
(m) (iv) the VHF installation in accordance with the provisions of
Regulation 17 (c);
Regulation 16 Radiotelephone installations
The existing text of paragraph (b) is amended by deleting A3H, A3A and
A3J.
The existing text of paragraph (c) is replaced by the following:
(c) (i) In the case of cargo ships of 300 tons gross tonnage and
upwards but less than 1, 600 tons gross tonnage the transmitter shall
have a minimum normal range of 150 miles, i.e. it shall be capable of
transmitting clearly perceptible signals from ship to ship by day and
under normal conditions and circumstances over this range.* (Clearly
perceptible signals will normally be received if the R.M.S. value of the
field strength produced at the receiver by an unmodulated carrier is at
least 25 microvolts per metre for double sideband and single sideband full
carrier emissions.)
[* In the absence of field strength measurements, it may be assumed
that this range will be obtained by a power in the antenna of 15 watts
(unmodulated carrier) with an antenna efficiency of 27 per cent for double
sideband emissions or 60 watts peak envelope power for single sideband
full carrier emissions when 100 per cent modulated by a single sinusoidal
oscillation.]
(ii) In the case of existing installations using double sideband
emissions on cargo ships of 300 tons gross tonnage and upwards but less
than 500 tons gross tonnage, the transmitter shall have a minimum normal
range of at least 75 miles.
The existing text of sub-paragraph (j) (iv) is replaced by:
(iv) the VHF installation in accordance with the provisions of
Regulation 17(c).
The existing text of Regulation 17 is replaced by the following:
Regulation 17 VHF radiotelephone installation
(a) The VHF radiotelephone installation shall be in the upper part of
the ship complying with the provisions of this Regulation and comprising a
transmitter and receiver, a source of energy capable of actuating them at
their rated power levels, and an antenna suitable for efficient radiating
and receiving signals at the operating frequencies.
(b) On board passenger ships irrespective of size and cargo ships of
500 tons gross tonnage and upwards it shall be possible to operate the VHF
radiotelephone installation from a source of energy which is situated in
the upper part of the ship and has sufficient capacity for at least six
hours of operation.
(c) The Administration may authorize the use of the reserve source of
energy of the radiotelegraph installation or the radiotelephone
installation respectively referred to in Regulation 10 (m) and Regulation
16 (j) to supply the VHF radiotelephone installation. In this case the
reserve source of energy is required to be of a capacity sufficient to
operate simultaneously the VHF radiotelephone installation and:
(i) the reserve radiotelegraph transmitter and receiver for at
least six hours unless a switching device is fitted to ensure alternate
operation only; or
(ii) the radiotelephone transmitter and receiver for at least six
hours unless a switching device is fitted to ensure alternate operation
only.
(d) The VHF radiotelephone installation shall conform to the
requirements laid down in the Radio Regulations for equipment used in the
VHF maritime mobile radiotelephone service and shall be capable of
operation on those channels specified by the Radio Regulations and as may
be required by the Contracting Government referred to in Regulation
4-1(b).
(e) The Contracting Government referred to in Regulation 4-1 (b) shall
not require the transmitter R.F. carrier power output to be greater than
10 watts. The antenna shall, in so far as is practicable, have an
unobstructed view in all directions.*
[* For guidance purposes, it is assumed that each ships is fitted with
a vertically polarized unity gain antenna at a nominal height of 9.15 m
above water, a transmitter R.F. power output of 10 watts, and a receiver
sensitivity of 2 microvolts across the input terminals for 20 dB
signal-to-noise ratio.]
(f) Control of the channels required for navigational safety shall be
immediately available on the navigating bridge convenient to the conning
position and, where necessary, facilities should be available to permit
radiocommunications from the wings of the navigating bridge.
Regulation 19 Radio logs
The following paragraph is added to the existing text and the existing
paragraph (c) is relettered as paragraph (d):
(c) On each ship fitted with a VHF radiotelephone installation in
accordance with Regulation 4-1:
(i) the entries required by the Radio Regulations shall be
recorded in the radio log in accordance with the requirements of the
Administration;
(ii) a summary of all communications relating to distress, urgency
and safety traffic shall be recorded in the ship's log.
CHAPTER V SAFETY OF NAVIGATION
Regulation 12 Shipborne navigational equipment
The existing text of Regulation 12 is replaced by the following:
(a) For the purpose of this Regulation "constructed" in respect of a
ship means a stage of construction where:
(i) the keel is laid; or
(ii) construction identifiable with a specific ship begins; or
(iii) assembly of that ship has commenced comprising at least 50
tonnes or 1 per cent of the estimated mass of all structural material,
whichever is less.
(b) (i) Ships of 150 tons gross tonnage and upwards shall be fitted
with:
(1) a standard magnetic compass, except as provided in
subparagraph (iv);
(2) a steering magnetic compass, unless heading information
provided by the standard compass required under (1) is made available and
is clearly readable by the helmsman at the main steering position;
(3) adequate means of communication between the standard
compass position and the normal navigation control position to the
satisfaction of the Administration; and
(4) Means for taking bearings as nearly as practicable over an
arc of the horizon of 360¡ã.
(ii) Each magnetic compass referred to in sub-paragraph (i) shall
be properly adjusted and its table or curve of residual deviations shall
be available at all times.
(iii) A spare magnetic compass, interchangeable with the standard
compass, shall be carried, unless the steering compass mentioned in
sub-paragraph (i) (2) or a gyro compass is fitted.
(iv) The Administration, if it considers it unreasonable or
unnecessary to require a standard magnetic compass, may exempt individual
ships or classes of ships from these requirements if the nature of the
voyage, the ship's proximity to land or the type of ship does not warrant
a standard compass, provided that a suitable steering compass is in all
cases carried.
(c) Ships of less than 150 tons gross tonnage shall, as far as the
Administration considers it reasonable and practicable, be fitted with a
steering compass and have means for taking bearings.
(d) Ships of 500 tons gross tonnage and upwards constructed on or
after 1 September 1984 shall be fitted with a gyro compass complying with
the following requirements:
(i) the master gyro compass or a gyro repeater shall be clearly
readable by the helmsman at the main steering position;
(ii) on ships of 1,600 tons gross tonnage and upwards a gyro
repeater or gyro repeaters shall be provided and shall be suitably placed
for taking bearings as nearly as practicable over an arc of the horizon of
360 ¡ã.
(e) Ships of 1,600 tons gross tonnage and upwards, constructed before
1 September 1984 when engaged on international voyages, shall be fitted
with a gyro compass complying with the requirements of paragraph (d).
(f) On ships provided with emergency steering positions, arrangements
shall be made to supply heading information to such positions.
(g) Ships of 500 tons gross tonnage and upwards constructed on or
after 1 September 1984 and ships of 1,600 tons gross tonnage and upwards
constructed before 1 September 1984 shall be fitted with a radar
installation.
(h) Ships of 10,000 tons gross tonnage and upwards shall be fitted
with two radar installations, each capable of being operated
independently * of the other.
[* Reference is made to section 4 of the Recommendation on Performance
Standards for Radar Equipment, adopted by the Organization by resolution
A. 477 (XII).]
(i) Facilities for plotting radar readings shall be provided on the
navigating bridge of ships required by paragraph (g) or (h) to be fitted
with a radar installation. In ships of 1,600 tons gross tonnage and
upwards constructed on or after 1 September 1984 the plotting facilities
shall be at least as effective as a reflection plotter.
(j) (i) An automatic radar plotting aid shall be fitted on:
(1) ships of 10,000 tons gross tonnage and upwards,
constructed on or after 1 September 1984;
(2) tankers constructed before 1 September 1984 as follows:
(aa) if of 40,000 tons gross tonnage and upwards by 1
January 1985;
(bb) if of 10,000 tons gross tonnage and upwards but less
than 40,000 tons gross tonnage, by 1 January 1986;
(3) ships constructed before 1 September 1984, that are not
tankers, as follows:
(aa) if of 40,000 tons gross tonnage and upwards by 1
September 1986;
(bb) if of 20,000 tons gross tonnage and upwards, but less
than 40,000 tons gross tonnage, by 1 September 1987;
(cc) if of 15,000 tons gross tonnage and upwards, but less
than 20,000 tons gross tonnage, by 1 September 1988.
(ii) Automatic radar plotting aids fitted prior to 1 September
1984 which do not fully conform to the performance standards adopted by
the Organization may, at the discretion of the Administration, be retained
until 1 January 1991.
(iii) The Administration may exempt ships from the requirements of
this paragraph, in cases where it considers it unreasonable or
unnecessary for such equipment to be carried, or when the ships will be
taken permanently out of service within two years of the appropriate
implementation date.
(k) When engaged on international voyages ships of 1,600 tons gross
tonnage and upwards constructed before 25 May 1980 and ships of 500 tons
gross tonnage and upwards constructed on or after 25 May 1980 shall be
fitted with an echosounding device.
(l) When engaged on international voyages ships of 500 tons gross
tonnage and upwards constructed on or after 1 September 1984 shall be
fitted with a device to indicate speed and distance. Ships required by
paragraph (j) to be fitted with an automatic radar plotting aid shall be
fitted with a device to indicate speed and distance through the water.
(m) Ships of 1,600 tons gross tonnage and upwards constructed before 1
September 1984 and all ships of 500 tons gross tonnage and upwards
constructed on or after 1 September 1984 shall be fitted with indicators
showing the rudder angle, the rate of revolution of each propeller and in
addition, if fitted with variable pitch propellers or lateral thrust
propellers, the pitch and operational mode of such propellers. All these
indicators shall be readable from the conning position.
(n) Ships of 100,000 tons gross tonnage and upwards constructed on or
after 1 September 1984 shall be fitted with a rate-of-turn indicator.
(o) Except as provided in Regulations I/7 (b) (ii), I/8 and I/9, while
all reasonable steps shall be taken to maintain the apparatus referred to
in paragraphs (d) to (n) in efficient working order, malfunctions of the
equipment shall not be considered as making a ship unseaworthy or as a
reason for delaying the ship in ports where repair facilities are not
readily available.
(p) When engaged on international voyages ships of 1,600 tons gross
tonnage and upwards shall be fitted with a radio direction-finding
apparatus complying with the provisions of Regulation IV/12(a). The
Administration may, in areas where it considers it unreasonable or
unnecessary for such apparatus to be carried, exempt any ship of less than
5,000 tons gross tonnage from this requirement, due regard being had to
the fact that radio direction-finding apparatus is of value both as a
navigational instrument and as an aid to locating ships, aircraft or
survival craft.
(q) When engaged on international voyages ships of 1,600 tons gross
tonnage and upwards constructed on or after 25 May 1980 shall be fitted
with radio equipment for homing on the radiotelephone distress frequency,
complying with the relevant provisions of Regulation IV/ 12(b).
(r) All equipment fitted in compliance with this Regulation shall be
of a type approved by the Administration. Equipment installed on board
ships on or after 1 September 1984 shall conform to appropriate
performance standards not inferior to those adopted by the Organization.
Equipment fitted prior to the adoption of related performance standards
may be exempted from full compliance with those standards at the
discretion of the Administration, having due regard to the recommended
criteria which the Organization might adopt in connexion with the
standards concerned.
(s) A rigidly connected composite unit of a pushing vessel and
associated pushed vessel, when designed as a dedicated and integrated tug
and barge combination, shall be regarded as a single ship for the purpose
of this Regulation.
(t) If the application of the requirements of this Regulation
necessitates structural alterations to a ship constructed before 1
September 1984, the Administration may allow extension of the time limit
for fitting the required equipment not later than 1 September 1989, taking
into account the first scheduled dry-docking of such a ship required by
the present Regulations.
(u) Except as provided elsewhere in this Regulation, the
Administration may grant to individual ships exemptions of a partial or
conditional nature, when any such ship is engaged on a voyage where the
maximum distance of the ship from the shore, the length and nature of the
voyage, the absence of general navigation hazards, and other conditions
affecting safety are such as to render the full application of this
Regulation unreasonable or unnecessary. When deciding whether or not to
grant exemptions to an individual ship, the Administration shall have
regard to the effect that an exemption may have upon the safety of all
other ships.
Regulation 16 Life-saving signals
The existing text of paragraph (d) is replaced by the following:
(d) Signals used by aircraft engaged on search and rescue operations
to direct ships towards an aircraft, ship or person in distress:
(i) The following manoeuvres performed in sequence by an aircraft
mean that the aircraft wishes to direct a surface craft towards an
aircraft or a surface craft in distress:
(1) circling the surface craft at least once;
(2) crossing the projected course of the surface craft close
ahead at low altitude, and:
- rocking the wings; or
- opening and closing the throttle; or
- changing the propeller pitch;
(Due to high noise level on board surface craft, the sound
signals may be less effective than the visual signal and are regarded as
alternative means of attracting attention).
(3) heading in the direction in which the surface craft is to
be directed.
Repetition of such manoeuvres has the same meaning.
(ii) The following manoeuvre by an aircraft means that the
assistance of the surface craft to which the signal is directed is no
longer required:
crossing the wake of the surface craft close astern at a
low altitude, and:
- rocking the wings; or
- opening and closing the throttle; or
- changing the propeller pitch.
(Due to high noise level on board surface craft, the sound
signals may be less effective than the visual signal and are regarded as
alternative means of attracting attention).
Note: Advance notification of changes in these signals will be given
by the Organization as necessary.
Regulation 18 VHF radiotelephones
The existing text of this Regulation is deleted (see Regulation
IV/4-1(b)).
Regulation 19 Use of the automatic pilot
The following paragraph is added to the existing text:
(d) The manual steering shall be tested after prolonged use of the
automatic pilot, and before entering areas where navigation demands
special caution.
Regulation 19-1 Operation of steering gear
The following Regulations are added to this Chapter:
In areas where navigation demands special caution, ships shall have
more than one steering gear power unit in operation when such units are
capable of simultaneous operation.
Regulation 19-2 Steering gear-testing and drill
(a) Within 12 hours before departure, the ship's steering gear shall
be checked and tested by the ship's crew. The test procedure shall
include, where applicable, the operation of the following:
(i) the main steering gear;
(ii) the auxiliary steering gear;
(iii) the remote steering gear control systems;
(iv) the steering positions located on the navigating bridge;
(v) the emergency power supply;
(vi) the rudder angle indicators in relation to the actual
position of the rudder;
(vii) the remote steering gear control system power failure
alarms;
(viii) the steering gear power unit failure alarms; and
(ix) automatic isolating arrangements and other automatic
equipment.
(b) The checks and tests shall include:
(i) the full movement of the rudder according to the required
capabilities of the steering gear;
(ii) a visual inspection of the steering gear and its connecting
linkage; and
(iii) the operation of the means of communication between the
navigating bridge and steering gear compartment.
(c) (i) Simple operating instructions with a block diagram showing the
change-over procedures for remote steering gear control systems and
steering gear power units shall be permanently displayed on the navigating
bridge and in the steering gear compartment.
(ii) All ship's officers concerned with the operation or
maintenance of steering gear shall be familiar with the operation of the
steering systems fitted on the ship and with the procedures for changing
from one system to another.
(d) In addition to the routine checks and tests prescribed in
paragraphs (a) and (b), emergency steering drills shall take place at
least once every three months in order to practise emergency steering
procedures. These drills shall include direct control from within the
steering gear compartment, the communications procedure with the
navigating bridge and, where applicable, the operation of alternative
power supplies.
(e) The Administration may waive the requirement to carry out the
checks and tests prescribed in paragraphs (a) and (b) for ships which
regularly engage on voyages of short duration. Such ships shall carry out
these checks and tests at least once every week.
(f) The date upon which the checks and tests prescribed in paragraphs
(a) and (b) are carried out and the date and details of emergency steering
drills carried out under paragraph (d), shall be recorded in the log book
as may be prescribed by the Administration.
CHAPTER VI CARRIAGE OF GRAIN
PART A GENERAL PROVISIONS
Regulation 1 Application
The existing text of Regulation 1 is replaced by the following:
Unless expressly provided otherwise this Chapter applies to the
carriage of grain in all ships to which the present Regulations apply and
in cargo ships of less than 500 tons gross tonnage.
PART B CALCULATION OF ASSUMED HEELING MOMENTS
SECTION V-ALTERNATIVE LOADING ARRANGEMENTS FOR EXISTING SHIPS
(A) GENERAL
Amend the second paragraph to read:
For the purpose of this Part the term "Existing Ship" means "a ship,
the keel of which is laid before 25 May 1980."
(B) STOWAGE OF SPECIALLY SUITABLE SHIPS
The existing text of sub-paragraph (a) (ii) (2) is replaced by the
following:
(2) in partly filled compartments or holds free grain surfaces
settle and shift as in subparagraph (1) or to such larger angle as may be
deemed necessary by the Administration, or by a Contracting Government on
behalf of the Administration, and grain surfaces, if overstowed, with the
bulk grain levelled and topped off with bagged grain or other suitable
cargo tightly stowed and extending to a height of not less than 1.22 m
above the top of the bulk grain within spaces divided by a longitudinal
bulkhead or shifting board, and not less than 1.52 m within spaces not so
divided and the bagged grain or other suitable cargo supported on suitable
platforms laid over the whole surface of the bulk grain, such platforms
consisting of bearers spaced not more than 1.22 m apart and 25 mm boards
laid thereon spaced not more than 0.10 m apart or of strong separation
cloths with adequate overlapping, will shift to an angle of 8 degrees with
the original levelled surfaces. For the purpose of this paragraph shifting
boards, if fitted, will be considered to limit the transverse shift of
the surface of the grain;
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