Section 2 Essential features for control, alarm and safety systems

2.1.1 Where it is proposed to install control, alarm and safety systems to the equipment defined in Pt 6, Ch 1, 1.2 Documentation required for design review 1.2.3, the applicable features contained in Pt 6, Ch 1, 2.1 Generalof the Rules for Ships are to be incorporated in the system design.

2.2.1 The requirements for control stations for machinery and equipment are given inPt 6, Ch 1, 2.2 Control stations for machineryof 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.

2.2.2 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 and the accommodation for operating personnel.

2.2.3 For requirements regarding general emergency alarm systems, see also Pt 7, Ch 1, 3.3 General emergency alarm systems.

2.3.1 The general requirements for alarm systems are given in Pt 6, Ch 1, 2.3 Alarm systems, general requirements of the Rules for Ships, which are to be complied with as required.

2.4.1 Where safety systems are provided the requirements of Pt 6, Ch 1, 2.4 Safety systems, general requirements of the Rules for Ships are to be satisfied. The requirements of this sub-Section apply, where relevant, to the safety systems installed on the equipment defined in Pt 6, Ch 1, 1.2 Documentation required for design review 1.2.3, including those safeguards required by Pt 5 MAIN AND AUXILIARY MACHINERY. Additions or amendments to these requirements are given in the following paragraph(s) of this sub-Section.

2.4.2 For emergency shut-down systems, see also Pt 7, Ch 1, 7 Emergency shutdown (ESD) systems.

2.5.1 The requirements for control systems are given in Pt 6, Ch 1, 2.5 Control systems, general requirementsof the Rules for Ships, which are to be complied with.

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.

2.6.3 Azimuth thrust direction is to be controlled from the workstation(s) for navigation and manoeuvring, under all seagoing and manoeuvring conditions.

2.6.4 Two means of communication are to be provided between the workstation(s) for navigation and manoeuvring and the main control station in the machinery space. One of these means may be the propulsion control system; the other is to be independent of the main electrical power supply, see also Pt 6, Ch 1, 2.2 Control stations for machinery and equipment 2.2.2 and Pt 5, Ch 1, 4.7 Communications of the Rules for Ships.

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.

2.7.2 For ballast controls of column-stabilised units, see also Pt 6, Ch 1, 2.8 Ballast control systems for column-stabilised units.

2.7.3 For requirements applicable to closing appliances on scuppers and sanitary discharges, see Pt 4, Ch 7, 10 Scuppers and sanitary discharges.

2.8.1 Column-stabilised units are to be provided with a ballast control system which meets the requirements of Pt 6, Ch 1, 2.8 Ballast control systems for column-stabilised units 2.8.2 to Pt 6, Ch 1, 2.8 Ballast control systems for column-stabilised units 2.8.8. The requirements for intact and damage stability and related definitions used in this Section are given in Pt 4, Ch 7 Watertight and Weathertight Integrity and Load Lines, to which reference should be made.

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.

2.8.4 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.

2.8.5 In addition to the centralised controls required by Pt 6, Ch 1, 2.8 Ballast control systems for column-stabilised units 2.8.3 and Pt 6, Ch 1, 2.8 Ballast control systems for column-stabilised units 2.8.3, permanently installed local controls are to be provided to allow operation in the event of failure of the centralised controls.

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.

2.8.8 Valve controls are to comply with Pt 6, Ch 1, 2.7 Valve control systems and, in addition, remote valve position indication systems are to function as independently as practicable of the control systems, see also Pt 5, Ch 13, 5 Ballast system and particularly Pt 5, Ch 13, 5.4 Control of pumps and valves.

2.9.1 The requirements for programmable electronic systems are given inPt 6, Ch 1, 2.10 Programmable electronic systems - General requirements of the Rules for Ships, which are to be complied with.

2.10.1 The requirements for data communication links are given in Pt 6, Ch 1, 2.11 Data communication links of the Rules for Ships, which are to be complied with.

2.11.1 The requirements for wireless data communication links are given inPt 6, Ch 1, 2.12 Additional requirements for wireless data communication links of the Rules for Ships, which are to be complied with. The requirements are in addition to Pt 6, Ch 1, 2.10 Data communication links and apply to systems incorporating wireless data communication links.

2.12.1 The requirements for programmable electronic systems incorporated in control, alarm or safety systems for essential services, as defined by Pt 6, Ch 2, 1.6 Definitions or safety critical systems, are given inPt 6, Ch 1, 2.13 Programmable electronic systems - Additional requirements for essential services and safety critical systems of the Rules for Ships, which are to be complied with. Additions or amendments to these requirements are given in the following paragraph(s) of this sub-Section.

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.

2.13.1 The additional requirements for programmable electronic systems for integrated systems are given in Pt 6, Ch 1, 2.14 Programmable electronic systems – Additional requirements for integrated systems of the Rules for Ships, which are to be complied with.