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发表于 2019-11-30 07:15
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来自： 中国江苏无锡
1.5.3 Emergency Fire Pump (1 July 2002)
The arrangement of sea connections, fire pumps and their sources of power are to be such as
to ensure that: if a fire in any one compartment could put all pumps required by 4-7-3/1.5.1
out of action, there is to be an alternative means consisting of a fixed independently driven
power-operated emergency pump which is to be capable of supplying two jets of water. The
pump and its location are to comply with the following requirements:
i) The capacity of the pump is not to be less than 40% of the total capacity of the fire
pumps required by 4-7-3/1.3.1 and in any case not less than the following:
• for cargo vessels of 2000 gross tonnage and upwards: 25 m3/h, and
• for cargo vessels less than 2000 gross tonnage: 15 m3/h.
Where applicable, the emergency fire pump is also to be capable of supplying
simultaneously the amount of water needed for any fixed fire-extinguishing system
protecting the space containing the main fire pumps. The pump is to be self-priming.
ii) When the pump is delivering the quantity of water required by 4-7-3/1.5.3i), the
pressure at any hydrant is to be not less than the minimum pressures given in
4-7-3/1.7.2.
iii) Any diesel driven power source for the pump is to be capable of being readily started
in its cold condition down to a temperature of 0°C (32°F) by hand (manual) cranking.
If this is impracticable, or if lower temperatures are likely to be encountered, heating
arrangements are to be provided so that ready starting will be assured. If hand
(manual) starting is impracticable, other means of starting may be considered. These
means are to be such as to enable the diesel driven power source to be started at least
6 times within a period of 30 minutes, and at least twice within the first 10 minutes.
Diesel engines exceeding 15 kW are to be equipped with an approved auxiliary
starting device, e.g., starting battery, independent hydraulic starting system or
independent starting air system.
iv) Any service fuel tank is to contain sufficient fuel to enable the pump to run on full
load for at least three hours and sufficient reserves of fuel are to be available outside
the machinery space of category A to enable the pump to be run on full load for an
additional 15 hours.
v) The total suction head and net positive suction head of the pump are to be such that
the requirements of 4-7-3/1.5.3i), 4-7-3/1.5.3ii) and 4-7-3/1.7.2 are obtained under
all conditions of list, trim, roll and pitch likely to be encountered in service. The
ballast condition of a vessel on entering or leaving a dry dock need not be considered
a service condition.
vi) The space containing the emergency fire pump is not to be contiguous to the
boundaries of machinery spaces of category A or those spaces containing main fire
pumps. Where this is not practicable, the common bulkhead between the two spaces
is to be insulated to a standard of structural fire protection equivalent to that required
for a control station. The common bulkhead is to be constructed to A-60 class
standard and the insulation is to extend at least 450 mm (18 in.) outside the area of the
joint bulkheads and decks.
The emergency fire pump, its seawater inlet, and suction and delivery pipes and
isolating valves are to be located outside of the machinery space containing the main
fire pump or pumps. The sea valve is to be operable from a position near the pump. If
this arrangement cannot be made, the sea-chest may be fitted in the machinery space
containing the main fire pump or pumps if the valve is remotely controlled from a
position near the pump in the same compartment as the emergency fire pump and the
suction pipe is to be as short as practicable. Short lengths of suction or discharge
piping may penetrate the machinery space containing the main fire pump or pumps,
provided they are enclosed in a substantial steel casing, or are insulated to A-60
class standard. The pipes are to have substantial wall thickness, but in no case less
than 11 mm (0.433 in.), and are to be welded, except for the flanged connection to the
sea inlet valve. For piping and pipe routing, see 4-7-3/1.11.3.
vii) No direct access is to be permitted between the machinery space or a space containing a
main fire pump and the space containing the emergency fire pump and its source of
power. Where this is impractical, either of the following arrangements may be
considered.
An arrangement where the access is by means of an airlock. One of the doors of the
machinery spaces is to be of A-60 class standard and the other is to be of steel, both
reasonably gastight, self-closing and without any hold back arrangements, or.
An access through a watertight door. This door is to be capable of being operated
from a space remote from the machinery space of category A and the space containing
the emergency fire pump and is to be unlikely to be cut off in the event of fire in those
spaces.
In both such cases, a second means of access to the space containing the emergency
fire pump and its source of power is to be provided.
viii) Ventilation arrangements to the space containing the independent source of power
for the emergency fire pump are to be such as to preclude, as far as practicable, the
possibility of smoke from a machinery space fire entering or being drawn into that
space. The space is to be well ventilated and power for mechanical ventilation is to
be supplied from the emergency source of power.
1.5.4 Alternative to Emergency Fire Pump
An emergency fire pump is not required if the two main fire pumps including their sources of
power, fuel supply, electric cables, lighting and ventilation for the space in which they are
located are in separate compartments so that a fire in any one compartment will not render
both main fire pumps inoperable. Only one common boundary is allowed between the two
compartments, provided the common boundary is A-0 class or higher. No direct access is
allowed between the two compartments, except that, where this is impracticable, an access
meeting the requirements of 4-7-3/1.5.3vii) may be considered. For piping and pipe routing,
see 4-7-3/1.11.3. |
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发表于 2008-5-27 11:51
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