Page 209 - Introduction to Marine Engineering

Deck machinery and hull equipment 193

Driving
motor

Flexible
coupling

Gear
housing

Figure 10.10 Bow thruster

athwartships tunnel through which water is directed to provide the
thrust.

Safety equipment

A number of items will now be considered under this general heading.
They are emergency equipment for power generation and pumping,
survival equipment such as lifeboats and liferafts, and the sound signal
equipment in the form of the whistle.

Emergency equipment
Emergency equipment is arranged to operate independently of all main
power sources. It includes such items as the emergency generator and
the emergency fire pump. Both items of machinery are located remote
from the engine room and usually above the bulkhead deck, that is at the
weather deck level or above. The emergency generator is usually on one
of the accommodation decks while the emergency fire pump is often
inside the forecastle.
The emergency generator is a diesel-driven generator of sufficient
capacity to provide essential circuits such as steering, navigation lights