D.1 Fire-extinguishing systems D.1.1 Fire pumps
D.1.1.1 The power supply to the motors and the fire-pump control systems are to be so arranged with regard to the assignment of sources of power, the routing of the power-supply cables and the location of the controls that a fire in any main fire zone cannot render all the fire pumps unserviceable (see also the GL Rules for Machinery Installations (I-1-2), Section 12, E.1).
D.1.1.2 If remote starting is provided for fire pumps, pump controls shall be so designed that in the event of failure of the remote control the local control remains operative. Regarding remote starting of fire pumps on ships with unattended engine room see Automation (I-1-4).
D.1.1.3 A bypass shall be provided, if fire pumps have a soft starter.
D.1.2 Pressure water spraying systems (Sprinkler)
For the design of these systems, see also the GL Rules for Machinery Installations (I-1-2), Section 12, L.
D.1.2.1 Pressure water spraying systems shall be supplied from the main and from the emergency source of electrical power.
D.1.2.2 The design of the fire-alarm system shall be acc. to the requirements of Section 9, D.
D.1.2.3 The switches at the main and emergency switchboards required for the power supply to all units forming part of the alarm- and extinguishing systems shall be clearly marked.
D.1.3 For cable laying, see Section 12, D.1.
Section 7 Power Equipment
D.2 Fans
D.2.1 On cargo ships power-driven fans for accommodation, service spaces, cargo spaces, control stations and machinery rooms shall be capable of being switched off from an easily reachable position as safe from fire as possible and located outside the spaces to be ventilated.
The switches for switching off the machinery space ventilation shall be separated from the switches for switching off the other fans. See Section 4, I.8.
D.2.2 It is recommended that one of the engine room fans should be supplied from the emergency source of electrical power to enable the extraction of fire-extinguishing gases, should the need arise. Due to this recommendation the requirements of Section 5, C.2.6 are to be observed.
D.2.3 Regarding fans for passenger ships, see Section 14.
D.3 Fuel pumps and separators
Controls shall be provided to enable the electric motors of fuel pumps and fuel and lubricating oil separa-tors to be stopped from outside the spaces concerned. See Section 4, I.8.
D.4 Pumps discharging overboard
The motors of pumps discharging overboard and whose outlets are located in the lifeboat launching area above the light waterline shall be equipped with switches next to the launching station of the lifeboats.
D.5 Turning gear
D.5.1 See also the GL Rules for Machinery Installations (I-1-2), Section 1, D.9.
D.5.2 The remote control of electrically driven turning gear shall be so designed that the gear motor stops immediately, if the switch or pushbutton is released.
D.5.3 An disconnect switch shall also be fitted near the drive unit.
D.5.4 The turning gear shall be equipped with a device which prevents the diesel engine from being started as long as the turning gear is engaged.
D.6 Electric starting equipment for main and auxiliary engines D.6.1 General
D.6.1.1 Regarding additional requirements for diesel engine starting equipment see the GL Rules for Machinery Installations (I-1-2), Section 2, H.
D.6.1.2 The starter batteries shall only be used for starting (and preheating where applicable) and for the monitoring equipment and controller associated with the engine.
Maintaining and monitoring of the charge-condition of the batteries is to be ensured.
D.6.2 Main engines
If main engines are started electrically, two starter batteries mutually independent are to be provided.
They shall be so arranged that they cannot be connected in parallel. Each battery shall be capable of starting the main engine from cold condition.
Thetotalcapacityofthestarterbatteriesshallbesufficientforthefollowingnumberofstartingoperationsto becarriedoutwithin30minuteswithoutrecharging:
reversible main engines:
12 combined reversal and starting operations
non-reversible main engines:
6 starting operations
D.6.3 Auxiliary engines D.6.3.1 Main generator sets
If several auxiliary engines are started electrically, at least two mutually independent batteries shall be provided. The use of the main engine starter batteries, if there are any, is permitted.
The capacity of the batteries shall be sufficient for at least three starting operations per engine.
If only one of the auxiliary engines is started electrically, one battery is sufficient.
D.6.3.2 Emergency generator sets
a) Each emergency generator set that has to be started automatically shall be equipped with a GL-approved starting device with sufficient power for at least three successive starting operations even at an ambient temperature of 0 C.
If starting is impossible at this temperature or if lower temperatures are likely to be encountered, heating shall be provided to ensure starting of the generator sets.
Additionally a second source of energy is to be provided capable of three further starting operations within 30 minutes. This requirement can be cancelled if the set can also be started manually.
b) To guarantee availability of the starting devices it is to be ensured that:
◦ electrical and hydraulic starter systems are supplied from the emergency switchboard
◦ compressed-air starter systems are supplied via a non-return valve from the main and auxiliary compressed-air or by an emergency air compressor supplied with power via the emergency switchboard
◦ the starting, charging and energy storage equipment is located in the emergency generator room.
These equipment is intended for the operation of emergency generator sets only and shall not be used for other purposes.
c) If automatic starting is not a requirement, starting equipment which ensures safe manual starting is permitted, e.g. by hand-crank, spring-powered starter, manual hydraulic or ignition cartridge starter.
d) If a direct start by hand is not possible, starting devices as in a) and b) shall be provided, manual initiation of the starting process is acceptable.
e) If a second source of starting energy is a mechanical starting facility, an electronical speed gover-nor, associated protection devices and valves shall have a back-up power supply independent of the first source of starting energy. This back-up source shall be monitored.
f) If mechanical starting facilities are provided, an electronical speed governor, associated protection devices and valves shall have two independent back-up power supplies. These back-up sources shall be monitored.
D.6.3.3 Emergency fire extinguishing sets
If manual starting by hand crank is not possible, the emergency fire extinguishing set shall be equipped with a GL-approved starting device capable of at least 6 starting operations within 30 minutes, two of them carried out within the first 10 minutes, even at an ambient temperature of 0 C.
D.7 Standby circuits for consumers
D.7.1 Standby circuits shall be provided for the reciprocal operation of consumers with the same function. Changeover to another unit due to a fault shall be signalled optically and audibly.
D.7.2 Automatically controlled groups of consumers shall be so structured that a fault in one group does not affect the functioning of other groups.
Section 7 Power Equipment