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Mech Theory 4 > Hydraulics > Flashcards

Hydraulics Flashcards

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1
Q

Define a fluid

A

-A substance that will take the shape of its container
-Can be a liquid or gas

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2
Q

Pressure Formula

A

Pressure = Force/Area

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3
Q

What are the Advantages of Hydraulics compared to Electrics?

There are 8 advantages

A

-Reliable
-Simple and easy to understand
-Infinite Speed Range
-Easily Reversed
-Ability to withstand overload
-No spark risks
-High torque at low speeds
-1/12 the size of equivalent electric motor

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4
Q

What are the Disadvantages of Hydraulics compared to Electrics?

There are 4 disadvantages

A

-Fire risk with mineral oil systems
-Noise
-Risk of Contamination
-Less Efficient (85-95%)

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5
Q

What is Denso Tape used for?

A

It is used to cover hydraulic fittings on the upper deck

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6
Q

What are the the hazards associated with Denso Tape?

A

It is highly flammable and gives off toxic fumes when burning

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7
Q

What are Fluorocarbon Elastomers used for?

A

Used to make ‘O Rings’

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8
Q

What hazards are associated with Fluorocarbon Elastomers?

A

When at exteme temperatures (300 Degrees Celcius), it can produce toxic gases such as Hydrogen Fluoride (HF)

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9
Q

What PPE is required when working with Fluorocarbon Elastomers?

There are 4 types of PPE required

A

-PVC Gauntlets
-PVC Coveralls
-Rubber Boots
-Full-Face Visor

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10
Q

What are the different types of Hydraulic Fluid?

A

-Petroleum Based (also known as Mineral)
-Synthetic Based

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11
Q

What are the different oils in use by the RN?

A

-OX30
-OX40
-OM33
-Rust Veto

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12
Q

What does O, X, M stand for when referring to oil and what does the number represent?

A

-O: Stands for Oil
-X: Stands for Synthetic
-M: Stands for Mineral
-Number: Represents Viscosity (Lower is Thinner)

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13
Q

Describe OX30

A

-Red
-Synthetic oil used in hydraulic machinery on HM Submarines

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14
Q

Describe OX40

A

-Green
-Synthetic oil used on hydraulic machinery on T23s, T45s and all future projects

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15
Q

Describe OM33

A

-Yellow/Orange
-General-Purpose petroleum based oil used on hydraulic machinery on T22s, T42s and CVS

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16
Q

Describe Rust Veto

A

-Used during upkeep periods when hydraulic oil has been removed from a system
-Used as a substitute to hydraulic fluid to prevent corrosion

17
Q

What are the requirements for a Hyrdraulic Fluid?

There are 6 requirements

A

-Transmission of Power (Main Requirement)
-Fluid must easily flow through lines
-Must be incompressible
-Lubrication
-Sealing Properties
-Cooling

18
Q

What are the most common causes of contamination in Hydraulic Oil?

There are 5 common causes

A

-Airbourne particles and moisture
-Construction Dirt
-Dirt in new fluid
-Dirt produced by wearing in new system
-Dirt from human sources

19
Q

What are the methods of reducing contamination?

There are 7 methods

A

-Good system design
-Filtration and filter management
-Operation of filter and clogging indicators
-Good working practices
-Use of a guardian filter pack
-Caps should be fitted to open pipework
-Clean working area

20
Q

What are the different types of Positive Displacement Pump?

There are 6 types

A

-Internal Gearwheel Pump
-External Gearwheel Pump
-Vane Type
-Lobe Type
-Radial Piston Type
-Axial Piston Pump

21
Q

Do we need Dynamic Displacement Pumps in a Hydraulic System?

A

No, Hydraulic Systems need high pressure pumps

22
Q

What are Axial Piston Pumps used on?

A

-Stabiliser Systems
-CPP Systems
-Steering Systems

23
Q

What is the purpose of an Actuator?

A

To convert Hydraulic Energy into Mechanical Motion

24
Q

What are the different types of Actuators?

A

-Linear
-Rotary

25
Q

What are the different types of Linear Actuators?

A

-Single
-Double Acting

26
Q

What is an Accumulator?

A

A device in which potential energy is held under pressure

27
Q

What are Accumulators used for?

A

Storing energy and smoothing out pulsations

Mech Theory 4 (4 decks)

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