Section
2 Essential features for control, alarm and safety systems
2.1 General
2.2 Control stations for machinery and
equipment
2.2.2 Means of communication are to be provided as applicable between the main
control station, subsidiary stations, the workstation(s) for navigation and
manoeuvring, the bridge area where applicable, the unit manager’s office, the drill
floor, the tool pusher’s office, areas for pipe-laying operations (as defined in
Pt 3, Ch 17, 1.1 Application 1.1.1) and the
accommodation for operating personnel.
2.3 Alarm systems
2.4 Safety systems
2.5 Control systems, general
requirements
2.6 Control for main propulsion
machinery
2.6.1 Where a control system for propulsion machinery is to be fitted, the
requirements ofPt 6, Ch 1, 2.6 Bridge control for main propulsion machinery of the Rules for Ships are to be complied with
where applicable. Additions or amendments to these requirements are given in the
following paragraph(s) of this sub-Section.
NOTES
- The workstation(s) for navigation and manoeuvring will be
located on the bridge of the unit, where such is provided. Where there is no
designated bridge area, the requirements of this sub-Section remain
applicable to the workstation(s) for navigation and manoeuvring, wherever
their location.
- Where separate workstations are provided for navigation and for
manoeuvring, the requirements of this Section, and those of Pt 6, Ch 1, 4.2 Alarm system for machinery, are applicable to the former.
- Where the Rules for Ships refer to ‘bridge control system’,
this should be understood to apply to propulsion control system.
2.6.2 Instrumentation to indicate the following is to be fitted at the
workstation(s) for navigation and manoeuvring:
- Propeller speed.
- Direction of rotation of propeller for a fixed pitch propeller
or pitch position for controllable pitch propeller, see also
Pt 5, Ch 7, 5 Control and monitoringof the Rules for Ships.
- Direction and magnitude thrust.
- Clutch position, where applicable.
- Shaft brake position, where applicable.
- For an azimuth thruster, direction and magnitude of thrust, and
alarms and indications as detailed in Table 20.4.1 Alarms for control systems in Pt 5, Ch 20 Azimuth Thrusters of the Rules for Ships.
2.6.3 Azimuth thrust direction is to be controlled from the workstation(s) for
navigation and manoeuvring, under all seagoing and manoeuvring conditions.
2.7 Valve control systems
2.7.1 The requirements for valve control systems are given in Pt 6, Ch 1, 2.7 Valve control systems of the Rules for Ships, which are to be complied
with where applicable. Additions or amendments to these requirements are given in
the following paragraph(s) of this sub-Section.
2.8 Ballast control systems for
column-stabilised units
2.8.2 A centralised ballast control station is to be provided from which all
ballast operations can be performed. It is to be situated above zones of immersion
after damage, as high as possible, as near a central position on the unit as is
practicable, and adequately protected from the weather.
2.8.3 Control and instrumentation for the following is to be provided at the
centralised control station:
- Ballast pump stop/start arrangements, status
indicators, and control facilities.
- Ballast valve controls and position
indication.
- Ballast tank level indication.
- Tank level indication of all tanks containing quantities of
liquid that could affect stability of the unit, including fuel oil, fresh
water, drilling water, and other stored liquids.
- Unit draught, heel and trim indication.
- Remote controls and indicators for watertight doors and hatch
covers and other closing appliances, see
Pt 7, Ch 1, 10 Protection against flooding.
- Bilge and flood alarms, see
Pt 7, Ch 1, 10 Protection against flooding.
- Mooring line tension indication.
2.8.4 A permanently installed means of communication, independent of the
unit’s main source of electrical power, is to be provided between the centralised
ballast control station and spaces that contain ballast pumps and services necessary
for ballast operations, including local hand controls called for in Pt 6, Ch 1, 2.8 Ballast control systems for column-stabilised units 2.8.5.
2.8.6 The independent local controls for each ballast pump and its associated
ballast tank valves are to be located in the same location, and a diagram of that
part of the system is to be permanently displayed at the local control position.
2.8.7 The local controls are to be in readily accessible positions, and the
associated access routes are to be situated inboard of the penetration zones after
defined damage, see
Pt 4, Ch 7, 3.2 Damage zones. They are also to remain accessible
and protected from the weather when the unit is in the intact and damaged condition.
2.9 Programmable electronic systems – General
requirements
2.10 Data communication links
2.11 Additional requirements for wireless data
communication links
2.12 Programmable electronic systems –
Additional requirements for essential services and safety critical systems
2.12.2 Input and output connections for safety critical systems (including
emergency shut-down push button signals) are to be hard-wired, unless shown to meet
the relevant requirements of Pt 7, Ch 1, 7 Emergency shutdown (ESD) systems, for emergency shutdown systems. The
transmission of the alarm and status information by digital means between the system
and the supervisory workstation is permissible.
2.12.3 Where sequential depressurisation systems are controlled by an
Integrated Control and Safety System (ICSS), the integrity of the system design is
to meet the requirements of Pt 3, Ch 8, 3.7 Depressurising system 3.7.8. The performance of
the sequential depressurisation system shall not be impacted by loss of
functionality from a single instrument room including of loss of functionality due
to loss of communications, software, and hardware failure or due to fire or
explosion in the instrument room.
2.13 Programmable electronic systems –
Additional requirements for integrated systems
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