Emergency Generators for a passenger ship of carrying 300 Passengers

The emergency generators for a passenger ship having capacity of carrying 300 passengers has to be completely renewed. The company contracted for the work has no previous experience of marine installation. You as the Second Engineer have been requested to write the specification for the type and installation to the generators.

A)Outline your proposal for the type of engine.

B)State the necessary requirements for approval and certification needed.

Ans)

a) A self- contained, self excited emergency source of electrical power is to be installed, having independent fuel, lubrication, cooling and starting arrangement,

2.The emergency source of elec. Power, transitional source of emergency power, emergency switchboard and emergency lighting switchboard are to be located above the uppermost continuous deck and be readily accessible from the open deck, they are not to be located forward of the collision bulkhead.

3. A fire or other casualty in spaces containing the main source of elec. Power or in any machinery space of catagory a will not interfere with the supply, control and distribution of emergency electrical power. The space containing the emergency source of electrical powers in not to be contiguous to the boundaries of machinery spaces of category a and those space containing the main source of electrical power.

4. The capacity of the electrical power is to be sufficient to supply all those services that are essential for safety in the emergency for a period of 36 hours.

5. The emergency generator is to be driven by a suitable prime mover with an independent supply of fuel having a flashpoint (closed cup) of not less than 43 deg c

6. To be started automatically upon failure to the emergency switchboard and to permit the emergency generator to carry its full land as quickly as is safe and practicable, subject to a maximum of 45 seconds.

7. To be able to operate at full rated power when the ship is listed by 22.5 deg and when the firm of the ship is 10 deg from an even keel or any combination of or upto these limits.

8. The emergency switchboard is to be installed in the same space as that of the emergency generator, No accumulator battery except for engine starting, to be installed in the same space as the emergency switchboard.

9. The emergency switchboard is to be supplied during normal operation from the main switchboard against overload and short circuit and which is to be disconnected automatically at the emergency switchboard upon failure of the main source of electrical power.

10. Provision is to be made for the periodic testing of the complete emergency system and is to include the testing of automatic starting arrangements,

11 Emergency generator engine is to be fitted with a speed governor, which with fixed setting, is to control the speed within 10 percent momentary variation and 5% permanent. variation when the total connected emergency statutory load is suddenly applied or taken off.

12. Emergency generator engine is to be fitted with are over speed protective device independent of the governor and to be so adjusted that the speed does not exceed 15% of rated speed

b) For a period of 36 hours, emergency lighting:

1. At every lifeboat preparation station, muster and embarkation station and over sides ,
2. in all alley ways, stair ways and exits, giving access to the muster and embarkation station,
3. in all service and accommodation alleyways, stairways and exits, personnel lift cars,
4. In the machinery spaces and main generating stations including their control positions, at each main and emergency switch board.
5. In all control station machines control rooms and at each main and emergency switchboard.
6. At all stowage positions for firemen’s outfits
7. at the steering gear; and
8. At the fire pump, the sprinkler pump and the emergency bilge pump and at the starting position of their motors;

b) For a period of 36 hours , the navigation lights and other lights required by the international regulations for prevention collisions at sea in fore

c) For a period of 36 hours,

1. All internal communication equipment required in are emergency;
2. The navigational aids as required by SOLAS
3. The fire detection, fire alarm, and sample extraction smoke detection system and the fire door holding and release system,
4. and for intermittent operation of daylight signaling lamp, the ships whistle, the manually operated call point and all interval signals that are required in an emergency.

d) For a period of 36 hours….

1. Emergency fire pump;
2. The automatic sprinkles p/p , and
3. The emergency bilge pump

e) The steering gear for a period of 30 mins.

f) For a period of half an hour

1. Any watch tight door of elec. Operated together with their control, indication and alarm circuits.

The arrangement to bring the lift cars in deck level for the escape of persons