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D1MC Semester 2 / ECS / March 2007/LSC /Hydraulic systems 1
To Be A Leader In Maritime Education & Training
Hydraulic systems
Steering gear Hydraulic pumps
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D1MC Semester 2 / ECS / March 2007/LSC /Hydraulic systems 2
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Hydraulic Systems
•A centralised hydraulic system consists of:
Duplicated oil pumps and motor
Accumulator Filters
Oil reservoir ( oil tank)
Control valvesPipework
Pressure regulators
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D1MC Semester 2 / ECS / March 2007/LSC /Hydraulic systems 3
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Hydraulic system components
Hydraulic valves group
Hydraulic valves & indicator
-close up.
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D1MC Semester 2 / ECS / March 2007/LSC /Hydraulic systems 4
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Hydraulic system components
Hydraulic pumps Electric motor drive
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D1MC Semester 2 / ECS / March 2007/LSC /Hydraulic systems 5
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Hydraulic system components
Hydraulic oil tank Hydraulic pumps
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Hydraulic Systems
Open Loop System
•The system takes oil from the tank and pumps itinto the hydraulic motor.
•A control valve is positioned in parallel with themotor.
•When it is open, the motor is stationary; when it
is throttled or closed the motor will operate.•The exhaust oil returns to the tank
•Commonly used in low pressure system and aresimple in design as well as reliable.
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Open Loop System
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Hydraulic pump
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Closed Loop System
•In the system, the exhaust (low pressure) oil
is returned direct to the pump suction.
•
Since the oil does not enter an open tank, thesystem is considered closed.
•Suitable for medium pressure system in
marine application .
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Closed Loop Systems
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Centralised Hydraulic Power System
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Hydraulic Systems
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Hydraulic Systems
Spool Valve
•Pilot operated four port directional valve.
•Valve is available with either two or three
operating positions with choice of spring offset,
spring centered, detent control or free spool
•Flows depending on valve size.
•Maximum pressure 210 bars.
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Hydraulic Systems - Spool Valve
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Hydraulic Systems
Accumulators•To maintain circuit pressure by compensating for pressure loss due to leakage or temperature rise.
•To supplement pump delivery where multiplecircuit operation have wide flow variations.
•To absorb shock by cushioning circuit pressure rise
as a result of sudden valve closure.•To provide a high energy power source where thereis high energy discharge after relatively longcharging period.
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Accumulator
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Hydraulic System
Hydraulic oil Properties•Low pour point ( -50 degree centigrade)
•Low viscosity ( 30 sec Redwood I at 600 C)
•High flash point ( closed flash point 1500 C)
• Non corrosive
• Non sludge forming
Factors affecting Hydraulic System Operation
•Temperature
•Cleanliness
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Hydraulically Operated Hatch Cover
•Two hydraulic rams actuated by an external powersource and controlled locally on side of hatchcoaming
•The rams are used to turn one pair of hatch
covers, at their hinges, through 180 degrees.•Each pair of hatch covers are linked together byhinges
• When the covers are opened by rolling back, they
are moved into the vertical position automatically.
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Hatch Cover
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Watertight Door
![08 Hydrologic and Hydraulic Analysis Frick Springs Br[1]](https://img.pdfslide.net/doc/110x75/577d1f951a28ab4e1e90e33b/08-hydrologic-and-hydraulic-analysis-frick-springs-br1.jpg)
