Page 211 - Introduction to Marine Engineering

Deck machinery and hull equipment 195

arrangements, etc., drives at one end a main fire pump and at the other
an hydraulic oil pump. The hydraulic oil pump supplies a hydraulic
motor, located low down in the ship, which in turn operates a sea water
booster pump. The booster pump has its own sea suction and discharges
to the main pump suction. The main pump then supplies sea water to
the fire main. The booster pump arrangement is necessary because of
the considerable depth of many large modern ships.

Survival equipment
Lifesaving equipment on board ship, apart from smaller items such as
lifebuoys and lifejackets, consists of lifeboats and liferafts. Lifeboats are
rigid vessels secured into davits which enable the boat to be launched
over the ship's side. Liferafts are inflatable vessels, usually stowed on
deck in canisters which must be thrown overboard, whereupon they are
automatically inflated.
Lifeboat accommodation for all the ship's crew must be provided on
both sides of the ship. This is to allow for a situation when only the boats
on one side can be lowered. The boats must be more than 7.3 m long and

Figure 10.12 Lifeboat