Page 9 - GEIMS Chronicle 22nd Edition-July 2022

Furthermore, the global lockdown has restricted the USE OF HYDRAULIC SYSTEM ON BOARD SHIP
procurement of necessary spares and equipment that are A hydraulic system is used on board for the following
mandatory for the safe operation of a vessel. A major reason purposes:
is that spares are sourced from different parts of the world.
1. Hydraulic cranes or derrick for cargo operations,
The lack of spares and safety equipment is a major risk
provision, and spare handling, Faculty Corner
factor that jeopardizes the safety of crew members and the
property on board the vessel. also to restore order and 2. Hydraulic mooring winches and anchor windlass,
ensure the supply of necessities. 3. Hydraulic capstan,
4. Steering Gear,
Meena Ravi Shankar 5. Hatch covers operation,
HR & Soft Skills Faculty 6. Deck lifting in the car carrier,
7. Valve operations,
8. Hydraulic nuts and pumps,
9. Pitch control of CPP, bow thruster, and stern thruster,
SHIPBOARD HYDRAULIC SYSTEMS - SKP Singh
10. Control of n stabilizers,
11. Water-tight doors etc.
INTRODUCTION
Hydraulics is the branch of engineering that deals with
practical problems of collecting, storing, measuring,
transporting, controlling, and using liquids. It is used for the
generation, control, and transmission of power by the use
of pressurized liquids. It differs from uid mechanics, which
is more theoretical and includes the study of gases as well
as liquids; and form hydrology, which is the study of the
properties, distribution, and circulation of the earth's water.
ADVANTAGES OF HYDRAULIC SYSTEM
1. The lubrication of rotating and reciprocating parts is
done automatically by the hydraulic uid in the system
itself.
2. Small components can handle large loads.
3. Hydraulic system design and construction are simple
and few parts are there.
4. Hydraulic systems are very exible. The same power
pack can do different jobs at different locations. Only
pipes and hoses are required for power transmission.
5. Hydraulic systems can be controlled very easily. Only a
lever is required to start, stop or reverse the actuator.
6. Actuator movement can be controlled more precisely
which saves wastage of energy and time.
7. In the hydraulic system, the force can be multiplied MAINTENANCE
without levers, pulleys, gears, or chains.
Contamination, Heat, and Leakage are the main dangers to
8. Speed can be controlled more efficiently. The motor can hydraulic systems. The poor condition of hydraulic oil is
be even made to stall. responsible for 75 % of hydraulic system failures. Heat,
9. Hydraulic actuator can be stopped or reversed instantly. leakage, and contamination follow each other It is

10. Constant torque with variable speed can be achieved in necessary to keep the system clean, cool, and leak-free.
hydraulic system actuators. Utmost care should be taken to keep the workplace and the
components clean during the overhaul. Do not use cotton
11. There are inbuilt safeties in hydraulic systems. Actuators
can be stalled even at full load. rags for cleaning components during overhaul. Prevent
contaminants such as dirt, water, cutting uids, and metal
12. Hydraulic actuator can be stopped by blocking the ow particles from entering the system around the reservoir
of hydraulic uid. No separate breaks, linings, etc are cover, openings for suction and drain lines, through
required.
breather openings past piston rod packing, and through
13. Hydraulic systems can be used even in hazardous leaks in pump suction lines.
conditions.
GEIMS CHRONICLE Twenty Second Edition July 2022 9
INDEX