Section
10 Protection against flooding
10.1 General requirements
10.1.1 The requirements for watertight and weathertight integrity and the
general requirements regarding the control and closure of watertight and
weathertight doors and hatch covers in order to satisfy the intact and damaged
stability criteria are given in Pt 4, Ch 1 General and Pt 4, Ch 8 Welding and Structural Details, to which reference should be made.
10.1.2 A system of alarm displays and controls is to be provided which will
ensure satisfactory supervision and control of watertight doors and hatch covers,
and also in the case of column-stabilised units to give warning of ingress of
water.
10.1.4 For ship and self-elevating units, the alarm displays and controls are
to be provided at a centralised panel either at the ballast control station, the
main control station, the workstation for navigation and manoeuvring or the
workstation for safety, on the navigating bridge, as applicable, see
Pt 4, Ch 8, 3 Secondary member end connections.
10.1.8 When other types of closing appliances (e.g. on ventilators) are
required to be remotely controlled or alarmed in accordance with the requirements of
Pt 4, Ch 8 Welding and Structural Details, the general requirements of this Section
are to be complied with, as applicable.
10.2 Electrically operated watertight doors and
hatches
10.2.1 The requirements for electrically operated watertight doors and hatches
are given in Pt 6, Ch 2, 18.1 Emergency lightingof the Rules for Ships, which are to be complied
with where applicable.
10.2.3 Where watertight doors and hatch covers are to be operated electrically,
the term ‘door’ is to be understood to include hatch covers.
10.2.4 Where the Rules for Ships refer to ‘bulkhead deck’ this should be
substituted for ‘final water plane after damage’.
10.2.5 The ‘master mode’ switch is to be Type Approved in accordance with
Test Specification Number 1 given in LR’s Type Approval Scheme.
10.3 Hydraulically operated watertight doors
and hatch covers
10.3.3 Where four or more doors or hatch covers are powered from a single
hydraulic power unit, duplicated hydraulic pump units are to be provided.
10.4 Indicators for doors, hatch covers and
other closing appliances
10.4.1 Indicators required by Pt 7, Ch 1, 10.1 General requirements 10.1.6 and Pt 7, Ch 1, 10.1 General requirements 10.1.7 on doors, hatch covers and other closing
appliances which are intended to ensure the watertight integrity of the unit’s
structure, are to meet the requirements of Pt 7, Ch 1, 10.4 Indicators for doors, hatch covers and other closing appliances 10.4.2 to Pt 7, Ch 1, 10.4 Indicators for doors, hatch covers and other closing appliances 10.4.3.
10.4.2 The indicator system is to be designed on the fail-safe principle, such
that, in the event of a fault, the system cannot incorrectly indicate that a door,
hatch cover, or other closing appliance is fully closed. A green light is to
indicate when a door, hatch cover or closing appliance is closed and a red light is
to indicate that it is not fully closed or secured.
10.4.3 The electrical power supply for the indicator system is to be independent
of any electrical power supply for operating and securing the doors and hatch
covers.
10.5 Bilge level and flood water level alarm
and indication
10.5.3 Bilge high level or water high level alarm sensors are to be installed
in all compartments, which are large enough to affect stability and which are
required to remain watertight to comply with the intact and damaged stability
criteria. Tanks fitted with remote tank level indicators with displays other than in
the ballast control room, are exempt from this requirement. The requirements for
chain lockers are to comply with Pt 5, Ch 13, 4.6 Column-stabilised units 4.6.9.
10.5.4 Pump-rooms, propulsion rooms and machinery spaces category type A in
lower hulls and columns are to be provided with two level sensors in each
compartment, one for detection of high bilge water level, and a second detector to
warn of flooding.
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