10.9.1 For category B craft at least three and
for category A craft at least two power bilge pumps should be fitted
connected to the bilge main, one of which may be driven by the propulsion
machinery. Alternatively, the arrangement may be in accordance with
the requirements of 10.3.14.
10.9.2 The arrangements should be such that at
least one power bilge pump should be available for use in all flooding
conditions which the craft is required to withstand as follows:
-
.1 one of the required bilge pumps should be an
emergency pump of a reliable submersible type having an emergency
source of power; or
-
.2 the bilge pumps and their sources of power
should be so distributed throughout the length of the craft that at
least one pump in an undamaged compartment will be available.
10.9.3 On multihull craft, each hull should be
provided with at least two bilge pumps.
10.9.4 Distribution boxes, cocks and valves in
connection with the bilge pumping system should be so arranged that,
in the event of flooding, one of the bilge pumps may be operative
in any compartment. In addition, damage to a pump or its pipe connecting
to the bilge main should not put the bilge system out of action. When,
in addition to the main bilge pumping system, an emergency bilge pumping
system is provided, it should be independent of the main system and
so arranged that a pump is capable of operating in any compartment
under flooding conditions as specified in 10.3.3.
In that case only the valves necessary for the operation of the emergency
system need be capable of being operated from above the datum.
10.9.5 All cocks and valves referred to in 10.9.4
which can be operated from above the datum should have their controls
at their place of operation clearly marked and should be provided
with means to indicate whether they are open or closed.