3 - Principal requirements for all systems
3.1 The system may be automatically
activated, automatically activated with provisions for
manual activation or manually activated.
3.2 All systems should be divided into
sections. Each section should be capable of being isolated
by one section control valve. The section control valves
should be located outside the protected space, be readily
accessible without entering the protected spaces and their
locations should be clearly and permanently indicated. It
should be possible to manually open and close the section
control valves either directly on the valve or via a control
system routed outside of the protected spaces. Means should
be provided to prevent the operation of the section control
valves by an unauthorized person. Control valve locations
should be adequately ventilated to minimize the build-up of
smoke.
3.3 The piping system should be sized in
accordance with a hydraulic calculation
technique1 such as the
Hazen-Williams hydraulic calculation technique or the
Darcy-Weisbach hydraulic calculation technique, to ensure
the availability of the flows and pressures required for
correct performance of the system. The design of the system
should ensure that full system pressure is available at the
most remote sprinkler or nozzle in each section within 60 s
of activation.
3.4 The system supply equipment should be
located outside the protected spaces and all power supply
components (including cables) should be installed outside of
the protected space. The electrical components of the
pressure source for the system should have a minimum rating
of IP 54.
3.5 Activation of an automatic system should
give a visual and audible alarm at a continuously manned
station. The alarm in the continuously manned station should
indicate the specific section of the system that is
activated. The system alarm requirements described within
this paragraph are in addition to, and not a substitute for,
the detection and fire alarm system required by SOLAS
regulation II-2/20.4.
3.6 Wet pipe systems on board vessels that
can operate in areas where temperatures below 0°C can be
expected, should be protected from freezing either by having
temperature control of the space, heating coils on pipes,
antifreeze agents or other equivalent measures.
3.7 The capacity of the system water supply
should be sufficient for the total simultaneous coverage of
the minimum coverage area of tables 4-1 to 4-3 and 5-1 and
the vertically applicable area as defined in paragraph
3.22.
3.8 The system should be provided with a
redundant means of pumping or otherwise supplying a
water-based extinguishing medium to the system. The capacity
of the redundant means should be sufficient to compensate
for the loss of any single supply pump or alternative
source. Failure of any one component in the power and
control system should not result in a reduction of required
pump capacity of deluge systems. In the case of wet pipe,
dry pipe and pre-action systems, failure of any one
component in the power and control system should not result
in a reduction of the automatic release capability or
reduction of required pump capacity by more than 50 per
cent. However, systems requiring an external power source
need only be supplied by the main power source. Hydraulic
calculations should be conducted to assure that sufficient
flow and pressure are delivered to the hydraulically most
demanding section both in normal operation and in the event
of the failure of any one component.
3.9 The system should be fitted with a
permanent sea inlet and be capable of continuous operation
during a fire using sea water.
3.10 The system and its components should be
designed to withstand ambient temperatures, vibration,
humidity, shock, impact, clogging and corrosion normally
encountered. Piping, pipe fittings and related components
except gaskets inside the protected spaces should be
designed to withstand 925°C. Distribution piping should be
constructed of galvanized steel, stainless steel, or
equivalent. Sprinklers and nozzles should comply with
paragraph 3.11.
3.11 The system and its components should be
designed and installed based on international standards
acceptable to the Organization2.
The nozzles should be manufactured and tested based on the
relevant sections of appendix A to circular MSC/Circ.1165 (Revised Guidelines
for the approval of equivalent water-based
fire-extinguishing systems for machinery spaces and cargo
pump-rooms).
3.12 A means for testing the automatic
operation of the system and, in addition, assuring the
required pressure and flow should be provided.
3.13 If the system is pre-primed with water
containing a fire suppression enhancing additive and/or an
antifreeze agent, periodic inspection and testing, as
specified by the manufacturer, should be undertaken to
assure that their effectiveness is being maintained. Fire
suppression enhancing additives should be approved for fire
protection service by an independent authority. The approval
should consider possible adverse health effects to exposed
personnel, including inhalation toxicity.
3.14 Operating instructions for the system
should be displayed at each operating position.
3.15 Installation plans and operating
manuals should be supplied to the ship and be readily
available on board. A list or plan should be displayed
showing spaces covered and the location of the zone in
respect of each section. Instructions for testing and
maintenance should be available on board.
3.16 Spare parts should be provided as
recommended by the manufacturer. In the case of automatic
sprinkler systems, the total number of spare sprinkler heads
for each type of sprinklers shall be six for the first 300,
12 for the first 1,000.
3.17 Where automatic systems are installed,
a warning notice should be displayed outside each entry
point stating the type of medium used (i.e. water) and the
possibility of automatic release.
3.18 All installation, operation and
maintenance instruction/plans for the system should be in
the working language of the ship. If the working language of
the ship is not English, French or Spanish, a translation
into one of these languages should be included.
3.19 Any foam concentrates used as system
additives should comply with the Revised Guidelines for the
performance and testing criteria and surveys of foam
concentrates for fixed fire-extinguishing systems (MSC.1/Circ.1312).
3.20 Means for flushing of systems with
fresh water should be provided.
3.21 The presence of obstructions and the
potential for shielding of the water spray should be
evaluated to ensure that the system performance is not
affected. Supplementary sprinklers or nozzles should be
installed beneath obstructions. In addition, nozzles should
be located to protect spaces above and below intermediate
decks, hoistable decks and ramps. Nozzles below hoistable
decks should be capable of protecting all applicable
heights.
3.22 Vertically the applicable area of all
decks, including hoistable decks or other intermediate
decks, between reasonably gas-tight steel decks (or
equivalent materials), should be included for simultaneous
coverage (example: with one hoistable deck, both the layer
above and below this deck with a dimensioning area complying
with tables 4-1 to 4-3 or 5-1 should be included in the
water supply calculations). Decks with ramps are accepted as
reasonably gas-tight decks assuming that the ramps are
always in their closed position at sea and the ramps and the
decks which these ramps are part of are reasonably
gas-tight.
3.23 All release controls for deluge
systems, monitor(s) for any CCTV system, the control panel
(or an indication panel) for the fire detection system,
water pressure on the discharge side of all pump units, and
the position indication of all section valves should be
available and grouped together in a continuously manned
control station or the safety centre, if provided.
3.24 The length of a deluge section (along
the lanes) should not be less than 20 m and the width of the
section should not be less than 14 m. Further, the sections
need not be longer or wider than the distance between
reasonably gas-tight steel bulkheads (or equivalent
materials). The maximum size of a section on any single deck
should be 48 m multiplied by the width of cargo space
(measured as distance between tight steel divisions).
Vertically one section can cover up to three decks.
1
Where the Hazen-Williams Method is used, the following
values of the friction factor C for different pipe types
which may be considered should apply:
Pipe type
|
C
|
Black or galvanized mild steel Copper and copper alloys Stainless steel
|
100 150 150
|
2
Pending the development of international standards
acceptable to the Organization, national standards as
prescribed by the Administration should be applied.