3.1 A means should be provided for manually starting
each pump from the operating compartment. Fault alarms should be provided to
indicate in the operating compartment when electric power is not available to the
pumps.
3.2 All system should be provided
with a means for manually starting the sprinkler pump at a readily accessible
position close to the pump such that access and operating means are located outside
the space being protected.
3.3 Means
should be provided to either automatically exhaust trapped air from the sprinkler
pump casing or prime the sprinkler pump from the operating compartment under all
operating conditions.
3.4 Means should be
provided to indicate the following in the operating compartment:
.1
sprinkler system pressure normal (for constantly pressurized system only);
.2 sprinkler system operating (pump
running); and
.3 sprinkler system failure
(loss of pressure).
3.5 A gauge should be provided in the operating
compartment to indicate sprinkler main pressure.
3.6 Pump, pipe and system sizing
3.6.1 Except as specified in 3.6.2, pumps, piping and other system supply
components should be sized and arranged so as to be capable of maintaining within
one minute of system activation a minimum flow corresponding to the simultaneous
operation of sprinklers in the following hydraulically most demanding design areas:
.1 for manual system with open nozzles - two horizontally adjacent
sprinkler sections but not less than 280m
2;
.2 for manual system with fusible element nozzles -
280m
2;
.3 for dry pipe and
combination systems - 150m
2;and
.4 for dry pipe and combination systems - 200 m
2.
3.6.2
For all types of systems, the design area can be reduced to the maximum size of the
largest space within fire resisting divisions (30 min or greater) on a single deck
area.
3.7 For systems other than those
permitted under 2.4,the water discharge rate should not be less than 5
l/m
2/min.
3.8 In automatic
systems, sprinkler pumps should start upon loss of system pressure.
3.9 A sprinkler pump should not be located in any space
protected by the sprinkler system it serves.
3.10 There should be not less than two sources of power supply for the
seawater pump and automatic alarm and detection system. Where the sources of power
for the pump are electrical, these should be a main generator and an emergency
source of power. One supply for the pump should be taken from the main switchboard,
and one from the emergency switchboard by separate feeders reserved solely for that
purpose. The feeders should be so arranged as to avoid galleys, machinery spaces and
other enclosed spaces of high fire risk except in so far as it is necessary to reach
the appropriate switchboards, and should be run to an automatic changeover switch
situated neat the sprinkler pump. This switch should permit the supply of power from
the main switchboard so long as a supply is available therefrom, and be so designed
that upon failure of that supply it would automatically change over to the supply
from the emergency switchboard. The switches on the main switchboard and the
emergency switchboard should be cleary labelled and normally kept closed. No other
switch should be permitted in the feeders concerned. One of the sources of power
supply for the alarm and detection system should be an emergency source. Where one
of the sources of power for the pump is an internal combustion engine, it should, in
addition to complying with the provisions of 3.9, be so situated that a fire in any
protected space would not affect the air supply to the machinery.
3.11 The sprinkler system should ha a connection from
the ship's fire main by way of a lockable screw-down non-return valve at th
connection which would prevent a backflow from the sprinkler system to the fire
main.
3.12 Primary power for sprinkler
pumps should be electrical motors. Emergency sources of power for sprinkler pumps
should consist of power from an emergency generator. Alternatively, a dedicated
diesel-driven pump may be provided as an emergency source of power.
3.13 Category A craft having a wet pipe sprinkler
system may have a hydropneumatic tank in lieu of an emergency source of power for
the sprinkler pump. The tank should be sized for 1-minute flow at the required
discharge rate over the design area.