The document summarizes the machinery arrangement in a ship's engine room. It describes that the engine room contains main machineries that provide propulsion and auxiliary machineries that support operations with electrical power, cooling, and heating. Major machineries are categorized as critical because if they become inoperable, they can endanger ship operations. The document then lists and describes various main and auxiliary machinery located in the engine room, including the main engine, diesel generators, pumps, heat exchangers, refrigeration systems, and electrical equipment. It also lists storage tanks located in the engine room for liquids like fuels, oils, and water.

1. Machinery Arrangement (Motor Ship)
Engine room is one of the compartments onboard ships and various machineries are
installed and arranged to provide power requirements either mechanical, electrical,
hydraulic or pneumatics for the operation of the ship. There are two main
classifications of machineries onboard. They are the main machineries which are
providing propulsion power to the ship and auxiliary machineries which are
supporting the main operation by providing electrical power, cooling, heating etc.
Major machineries in the engine room are categorized as “Critical Machineries”
under the Safety Management System which define as when they become
inoperative, it will render hazards to the operation of the ship.
Machineries are arranged systematically and with accordance to their operational
requirement. These machineries are described as follows:
Main Engine
Provides propulsion power to the ship and is made of diesel engine. Commonly
called as main power plant or the “main engine”, classified by the company’s Safety
Management System as “Critical Machinery”, situated at the center of the engine
room, bolted to the hull at the bottom by commonly called “holding down bolts” and
braced on the top to ensure that the power being developed is efficiently transmitted
to the ship hull via the propeller.
Diesel Generator Engine
Provide mechanical power to the electric generating equipment of the ship.
Commonly term as “auxiliary diesel engine”, and coupled to a generator. There are 4
units available onboard and also categorized as “Critical Machinery”.

2. Air Compressor
Generates compressed air at required pressure and stored in cylindrical tanks. The
compressed air is used for starting diesel engines, control air for instrumentation,
maintenance cleaning purposes and others.
Auxiliary Boiler
Sealed vessel where water is converted into steam. Steam is generated at certain
pressure to make it usable. Generally, steam is used for heating, medium of prime
mover such as Turbo Generator, turbine pumps etc., and for other purposes. It is
categorized as “Critical Machinery” onboard.
Exhaust Gas Economizer (EGE)
Waste heat recovery equipment for the main engine exhaust gas produces steam.
The heat that was forced out from the main engine (exhaust gas) passes to the rows
of tubes, heating the water inside the tubes and thus, generating steam. Commonly,
when the ship is underway or in navigating waters, the EGE is used for steam
generation and the auxiliary boiler is in stand-by condition. The steam generated is
used for heating fuel oil, lube oil and other purposes. It is categorized as “Critical
Machinery'' onboard.

3. Purifier
Device used as separators of liquid to liquid or solid particles to fuel oil or lube oil
used for diesel engines onboard. It can purify and remove sediments from fuel oil
and lube oil to certain acceptable characteristics. In some cases, they are also used
as clarifiers as in the case that oil contains large amounts of sludge (solid particles)
and less amount of water (oil whose density is more than 1.0).
Homogenizer
To counteract the problems associated with today’s fuel oil, homogenization is being
applied to improve the engine performance.
Homogenizer is the device used to grind the fuel oil as it is pumped through the unit.
This device works just like a milling machine for processing of sludge, asphaltenes,
etc., that are commonly associated in the fuel oil even after treatment.

4. Fresh Water Generator
Fresh water generator or “Distilling Plant '' generates fresh water onboard. Fresh
water is produced by boiling the sea water and condensing into freshwater. Primary
heating used is the jacket cooling water of the main engine.
Pump
Pump provides sufficient energy to the flow of liquid such as fuel oil, lube oil, water
etc. Centrifugal Pumps, Piston pumps, Screw Pumps and Gear pumps are
commonly installed in the engine room.
Heat Exchanger
Heat exchanger allows heat transfer of fluid to another. Heat exchangers are used
for fuel oil, lube oil, fresh water, sea water and refrigeration systems. They can be
coolers, heaters and condensers.

5. Provision Refrigeration Plant
For the preservation of foods onboard for the consumption of crew, a provision
refrigerating machine is installed. It provides cooling to freeze and chill meat, fish,
vegetables and other products.
Air Conditioning Plant
Air conditioning plant provides conditioned air to the ships accommodation to make it
habitable. The system continuously provides and maintains clean, temperature and
humid controlled condition air in the ship's cabin, offices and the bridge.
Oily Water Separator
Oil and water mixture in the engine room bilge system is processed in the Oily water
separator, and it separates oil and water mixture into a clean effluent before being

6. discharged into the sea (max. 15 ppm as per MARPOL 73/78 Regulation). The
device is one of the most important equipment for environmental protection. It is
categorized as “Critical Machinery” onboard.
Incinerator
Segregated garbage and solid wastes generated onboard are burned in the
incinerator. It is constructed of heavy and well-insulated materials to keep the high
levels of heat inside the furnace so that the waste is burned quickly and efficiently.
Fan and Blower
Fan and blower are used to create air flow for various purposes. Ventilation fan as an
example are provided to supply/exhaust the required amount of air in the engine
room.

7. Main and Emergency Air Reservoir
Main and emergency air reservoirs are provided onboard to store pressurized air for
various purposes. The reservoir is designed to kept sufficient air for starting of the
main engine, instrumentation and maintenance purposes.
Control Air Dryer
To maintain clean and dry controlled air for the supply of the various instruments in
the main engine, a control air dryer is provided. The device is operating in the
reverse procedure of refrigeration.

8. Marine Growth Prevention System and Ferrous Ion Generator
MGPS provides an amount of electric current to produce chlorine that attacks marine
growths and prevents them from entering the cooling system piping.
Fe ion generator used to protect the sea water cooling system by providing anti
corrosion film substances in the cooling tubes (heat exchanger).
Electrical Equipment
Various electrical equipment can also be found onboard. Some of the electrical
equipment is coupled with other types of machinery such as mechanical, hydraulic or
pneumatic devices, e.g. pumps, fans, etc.
Generator
Primary equipment onboard that generates electricity for electrical power supply to
all electrical machinery and devices.
Main Switchboard and Feeder Panel
The main switchboard and feeder panel directs the electricity generated from the
generator to the various electrical equipment onboard.

9. Electric Motor
Device that converts electrical energy to mechanical energy and it is the reciprocal of
electric generators. Motors are commonly coupled to fans, pumps and other
equipment onboard.
Emergency Generator and Emergency Switchboard
Emergency electrical power is provided and directed by the emergency generator
and emergency switchboards. The amount of electrical power supplied is sufficient to
operate the various emergency equipment onboard.

10. Emergency Batteries
Another source of electric power onboard on limited time is the emergency batteries.
It is primarily used when all the electric generating equipment has failed, for
immediate and temporary supply to emergency lightings and radio communication
equipment.
Other Machineries
Emergency Fire Pump
Used to supply seawater to hydrants necessary for fighting any breakdown of fire
onboard. The source of electrical power can be taken from main or emergency
generating equipment.
Steering Gear System
Steering gear system provides steering capability for the ship to attain the course it is
directed. It is the prime navigational equipment in the bridge. The steering capability
can be controlled automatically or manually. It is categorized as “Critical Machinery”
onboard.

11. Sewage Treatment Plant
A device that processed and removed contaminants from domestic waste water
generated onboard. Its purpose is to produce a waste stream or treated effluent and
solid waste sludge suitable for discharge at sea. It is categorized as “Critical
Machinery” onboard.
Mooring Winch/Windlass
Equipment used for holding the ship in place while in port or at anchorage area.
Mainly consists of electrical motors, pumps, hydraulic systems and winches. Mooring
winches/windlasses are situated in the forward and aft part of the ship. It is
categorized as “Critical Machinery” onboard.

12. Bow Thruster
A propulsion device built or mounted on the ship's bow to increase its
maneuverability. It is specifically used for docking to make maneuverability of the
ships easier, turning from port to starboard or vice versa without using the main
propulsion.
Workshop
It provides a working area in the engine room and on deck for the maintenance of
equipment and for the storage of tools and spares.
Tanks

13. To provide storage capability for liquid materials in the ships, storage tanks and
service tanks are provided. Location, sizes and capacity varies depending on the
type of liquid to be stored such as fuel oil, lube oil, fresh water, sea water and others.
Lists of Tanks in the Engine Room
a. Main L.O. Sump Tank
b. Main L.O. Storage Tank
c. Main L.O. Settling Tank
d. Cylinder Oil Storage Tank
e. Cylinder Oil Measuring Tank
f. S/T L.O. Gravity Tank
g. S/T L.O. sump Tank
h. S/T Forward Seal Tank
i. G/E L.O. Sump Tank
j. G/E L.O. Storage Tank
k. G/E L.O. Overflow Tank
l. Cooling F.W. Expansion Tank
m. Feed Filter Tank
n. Clean Drain Tank
o. Bilge Tank
p. Bilge Separated Oil Tank
q. Bilge Primary Tank
r. H.F.O Storage Tank
s. L.S.H.F.O. Settling Tank
t. Boiler F.O. Settling Tank
u. H.F.O. Service Tank
v. M.D.O. Storage Tank
w. M.D.O. Sett./Serv. Tank
x. Waste Oil Settling Tank
y. F.O./L.O. Sludge Tank
z. M/E Air Cooler Chemical Cleaning Tank
Lay-out of Machinery Arrangement in the Engine Room
To facilitate easy understanding of machinery arrangement and location in the
engine room, “ Machinery Arrangement in the Engine Room” lay-out is provided. The
figure below is the actual machinery arrangement drawn in the engine room of NYK
Terra.