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DNV-OS-D301 Fire Protection |
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| Ch.2: Technical Provisions |
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| App.A: Fixed Fire Fighting Systems |
Ch.2
Guidance note: ---e-n-d---o-f---G-u-i-d-a-n-c-e---n-o-t-e---
Reference is made to IMO MSC/Circ.668 'Guidelines
for the approval of water-based fire-extinguishing systems as referred
to in SOLAS 74 for machinery spaces and cargo pump-rooms',
as amended by IMO MSC/Circ.728.
(SOLAS reg. II-2/10.1)
Ch.2 App.A A
103 The number and arrangement
of the nozzles shall be to the satisfaction of the Administration
and shall be such as to ensure an effective average distribution
of water of at least 5 l/m/minute in the spaces
to be protected. Where increased application rates are considered
necessary, these shall be to the satisfaction of the Administration.
Nozzles shall be fitted above bilges, tank tops and other areas
over which oil fuel is liable to spread and also above other specific
fire hazards in the machinery spaces.
(SOLAS reg. II-2/10.2)
Ch.2 App.A A
104 The system may be divided
into sections, the distribution valves of which shall be operated
from easily accessible positions outside the spaces to be protected
and will not be readily cut off by a fire in the protected space.
(SOLAS reg. II-2/10.3)
Ch.2 App.A A
105 The system shall be kept
charged at the necessary pressure and the pump supplying the water
for the system shall be put automatically into action by a pressure
drop in the system.
(SOLAS reg. II-2/10.4)
Ch.2 App.A A
106 The pump shall be capable
of simultaneously supplying at the necessary pressure all sections
of the system in any one compartment to be protected. The pump and
its controls shall be installed outside the space or spaces to be
protected. It shall not be possible for a fire in the space or spaces
protected by the water-spraying system to put the system out of
action.
(SOLAS reg. II-2/10.5)
Ch.2 App.A A
107 The pump may be driven
by independent internal combustion machinery but, if it is dependent
upon power being supplied from the emergency generator fitted in
compliance with the provisions of regulation II-1/44 or
regulation II-1/45, as appropriate, that generator shall
be so arranged as to start automatically in case of main power failure
so that power for the pump required by paragraph 5 (105) is immediately
available. When the pump is driven by independent internal combustion machinery
it shall be so situated that a fire in the protected space will
not affect the air supply to the machinery.
(SOLAS reg. II-2/10.6)
Ch.2 App.A A
108 Precautions shall be taken
to prevent the nozzles from becoming clogged by impurities in the
water or corrosion of piping, nozzles, valves and pump.
(SOLAS reg. II-2/10.7)
(SOLAS reg. II-2/9.1.1)
Ch.2 App.A B
202 The Administration may
permit alternative arrangements and discharge rates provided that
it is satisfied that equivalent protection is achieved.
(SOLAS reg. II-2/9.1.2)
Ch.2 App.A B
203 Supply ducts for delivering
foam, air intakes to the foam generator and the number of foam-producing
units shall in the opinion of the Administration be such as will
provide effective foam production and distribution.
(SOLAS reg. II-2/9.2)
Ch.2 App.A B
204 The arrangement of the
foam generator delivery ducting shall be such that a fire in the
protected space will not affect the foam generating equipment.
(SOLAS reg. II-2/9.3)
Ch.2 App.A B
205 The foam generator, its
sources of power supply, foam-forming liquid and means of controlling
the system shall be readily accessible and simple to operate and
shall be grouped in as few locations as possible at positions not
likely to be cut off by a fire in the protected space.
(SOLAS reg. II-2/9.4)
Guidance note: ---e-n-d---o-f---G-u-i-d-a-n-c-e---n-o-t-e---
Reference is made to IMO MSC/Circ.776 'Guidelines
for the approval of equivalent fixed gas fire-extinguishing systems,
as referred to in SOLAS 74, for machinery spaces and cargo pump rooms.'
(SOLAS reg. II-2/5.1.1)
Ch.2 App.A C
202 The necessary pipes for
conveying fire-extinguishing medium into protected spaces shall
be provided with control valves so marked as to indicate clearly
the spaces to which the pipes are led. Suitable provision shall
be made to prevent inadvertent admission of the medium to any space.
Where a cargo space fitted with a gas fire-extinguishing system
is used as a passenger space the gas connection shall be blanked
during such use.
(SOLAS reg. II-2/5.1.2)
Ch.2 App.A C
203 The piping for the distribution
of fire-extinguishing medium shall be arranged and discharge nozzles
so positioned that a uniform distribution of medium is obtained.
(SOLAS reg. II-2/5.1.3)
Ch.2 App.A C
204 Means shall be provided
to close all openings which may admit air to or allow gas to escape
from a protected space.
(SOLAS reg. II-2/5.1.4)
Ch.2 App.A C
205 Where the volume of free
air contained in air receivers in any space is such that, if released
in such space in the event of fire, such release of air within that
space would seriously affect the efficiency of the fixed fire-extinguishing
system, the Administration shall require the provision of an additional
quantity of fire-extinguishing medium.
(SOLAS reg. II-2/5.1.5)
Ch.2 App.A C
206 Means shall be provided
for automatically giving audible warning of the release of fire-extinguishing
medium into any space in which personnel normally work or to which
they have access. The alarm shall operate for a suitable period
before the medium is released.
(SOLAS reg. II-2/5.1.6)
Ch.2 App.A C
207 The means of control of
any fixed gas fire-extinguishing system shall be readily accessible
and simple to operate and shall be grouped together in as few locations
as possible at positions not likely to be cut off by a fire in a
protected space. At each location there shall be clear instructions
relating to the operation of the system having regard to the safety
of personnel.
(SOLAS reg. II-2/5.1.7)
Ch.2 App.A C
208 Automatic release of fire-extinguishing
medium shall not be permitted, except as permitted by paragraph
3.3.5 (SOLAS reg. II-2) and
in respect of local automatically operated units referred to in
paragraphs 3.4 and 3.5 (SOLAS reg. II-2)
(SOLAS reg. II-2/5.1.8)
Ch.2 App.A C
209 Where the quantity of extinguishing
medium is required to protect more than one space, the quantity
of medium available need not be more than the largest quantity required
for any one space so protected.
(SOLAS reg. II-2/5.1.9)
Ch.2 App.A C
210 Except as otherwise permitted
by paragraphs 3.3, 3.4 or 3.5 (SOLAS reg. II-2) pressure containers required for the storage
of fire-extinguishing medium, other than steam, shall be located
outside protected spaces in accordance with paragraph 1.13.
(SOLAS reg. II-2/5.1.10)
Ch.2 App.A C
211 Means shall be provided
for the crew to safely check the quantity of medium in the containers.
(SOLAS reg. II-2/5.1.11)
Ch.2 App.A C
212 Containers for the storage
of fire-extinguishing medium and associated pressure components
shall be designed to pressure codes of practice to the satisfaction
of the Administration having regard to their locations and maximum
ambient temperatures expected in service.
(SOLAS reg. II-2/5.1.12)
Ch.2 App.A C
213 When the fire-extinguishing
medium is stored outside a protected space, it shall be stored in
a room which shall be situated in a safe and readily accessible
position and shall be effectively ventilated to the satisfaction
of the Administration. Any entrance to such a storage room shall
preferably be from the open deck and in any case shall be independent
of the protected space. Access doors shall open outwards, and bulkheads
and decks including doors and other means of closing any opening
therein, which form the boundaries between such rooms and adjoining
enclosed spaces shall be gastight. For the purpose of the application
of the integrity tables in regulations 26 (SOLAS reg.
II-2), such storage rooms shall
be treated as control stations.
(SOLAS reg. II-2/5.1.13)
Ch.2 App.A C
214 Spare parts for the system
shall be stored on board and be to the satisfaction of the Administration.
(SOLAS reg. II-2/5.1.14)
For cargo spaces the quantity of carbon dioxide available shall, unless otherwise provided, be sufficient to give a minimum volume of free gas equal to 30% of the gross volume of the largest cargo space so protected in the ship.
(SOLAS reg. II-2/5.2.1)
Ch.2 App.A C
302 For machinery spaces the
quantity of carbon dioxide carried shall be sufficient to give a
minimum volume of free gas equal to the larger of the following
volumes, either:
| - | 40% of the gross volume of the largest machinery space so protected, the volume to exclude that part of the casing above the level at which the horizontal area of the casing is 40% or less of the horizontal area of the space concerned taken midway between the tank top and the lowest part of the casing; or |
| - | 35% of the gross volume of the largest machinery space protected, including the casing; provided that the above-mentioned percentages may be reduced to 35% and 30% respectively for cargo ships of less than 2000 gross tonnage; provided also that if two or more machinery spaces are not entirely separate they shall be considered as forming one space. |
(SOLAS reg. II-2/5.2.2)
Ch.2 App.A C
303 For the purpose of this
paragraph the volume of free carbon dioxide shall be calculated
at 0.56 m/kg.
(SOLAS reg. II-2/5.2.3)
Ch.2 App.A C
304 For machinery spaces the
fixed piping system shall be such that 85% of the gas can
be discharged into the space within 2 minutes.
(SOLAS reg. II-2/5.2.4)
Ch.2 App.A C
305 Carbon dioxide systems
installed on or after 1 October 1994 shall comply with the following
requirements:
| - | Two separate controls shall be provided for releasing carbon dioxide into a protected space and to ensure the activities of the alarm. One control shall be used to discharge the gas from its storage containers. A second control shall be used for opening the valve of the piping which conveys the gas into the protected space. |
| - | The two controls shall be located inside a release box clearly identified for the particular space. If the box containing the controls is to be locked, a key to the box shall be in a break-glass type enclosure conspicuously located adjacent to the box. |
(SOLAS reg. II-2/5.2.5)
(SOLAS reg. II-2/5.3.1)
Guidance note: ---e-n-d---o-f---G-u-i-d-a-n-c-e---n-o-t-e---
Gas fire-extinguishing systems for replacing or as an alternative to
Halon have been type approved by DNV, and tentative rules for such
systems are available upon request.
(SOLAS reg. II-2/5.4)
(SOLAS reg. II-2/5.5.1)
Ch.2 App.A C
602 Where such gas is used
as the fire-extinguishing medium in a fixed fire-extinguishing system
for the protection of machinery spaces it shall afford protection
equivalent to that provided by a fixed system using carbon dioxide
as the medium.
(SOLAS reg. II-2/5.5.2)
Ch.2 App.A C
603 Where such gas is used
as a fire-extinguishing medium in a fixed fire-extinguishing system
for the protection of cargo spaces, a sufficient quantity of such
gas shall be available to supply hourly a volume of free gas at
least equal to 25% of the gross volume of the largest space
protected in this way for a period of 72 hours.
(SOLAS reg. II-2/5.5.3)
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