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ETICC > Basic systems > Flashcards

Basic systems Flashcards

1
Q

Definition of a system

A

A series of interconnecting pipes and components that deliver a substance from one point to another.

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2
Q

Types of system

A

Open loop and closed loop

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3
Q

Open loop system

A

The working fluid is consumed e.g. fuel system

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4
Q

Closed loop system

A

The working fluid is reused e.g. fresh water cooling system

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5
Q

Types of tank

A

Header tanks, service tanks and drain tanks

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6
Q

Header tank

A

Used as a reservoir to top up a tank or system.

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7
Q

Service tank

A

Used as a reservoir for clean, water-free supply of fuel.

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8
Q

Drain tank

A

Used to collect oil from a system.

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9
Q

Types of tank gauges

A

Contents gauge, sounding tube, gauge glass

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10
Q

Contents gauge

A

Used to indicate how much liquid remains in a tank

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11
Q

Sounding tube

A

Used to allow us to measure the depth of liquid in a tank

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12
Q

Gauge glass

A

Gives a visual indication of how much liquid is left in the tank

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13
Q

Dip tape

A

Used to find the height level of the liquid in the tank

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14
Q

Strainers

A

A metal plate with 3 holes in, used to remove large coarse particles

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15
Q

The material used for pipes depends on:

A

Fluid
Temperature and pressure
Other types of material used within the system

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16
Q

Materials used for pipes

A 
Phosphor bronze
Copper
Copper nickel
Brass
Plastic
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17
Q

Phosphor bronze

A

High pressure salt water

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18
Q

Copper

A

Domestic fresh water

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19
Q

Copper nickel

A

Lub oil

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20
Q

Brass

A

Castings e.g. taps, valve bodies

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21
Q

Plastic

A

Sewage and pre-wet

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22
Q

Plastic

A

Sewage and pre-wet

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23
Q

Type of seal used depends on:

A

Pressure
Fluid
Temperature

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24
Q

Gaskets can be made from

A 
Non asbestos fibre
Paper
Leather
Cork
Copper
Rubber
25
Q

Examples of seals

A

Mechanical seals
Keeler ring couplings
Gland packing

26
Q

Purpose of valves

A

Valves and cocks provide a method of controlling flow or pressure of a liquid or gas and as a means of isolating a system.

27
Q

Types of valve

A 
Globe valve
Gate valve
Flap valve
Saunders valve
Pressure relief valve
Ball seated cock
Reducing valve
Non-return valve
28
Q

Globe valve

A

Can be altered to provide a variety of services such as being a non-return valve or two way flow

29
Q

Gate valve

A

Used mostly on large bore systems such as ventilation.

30
Q

Flap valve

A

Simple type of non-return valve

31
Q

Saunders valve

A

Valve fitted with a rubber diaphragm, used in water and fuel systems

32
Q

Ball seated cock

A

Has a hole through it so that when the valve is turned 90 degrees it lines up with the flow

33
Q

Pressure relief valve

A

Valve is kept shut by a pressurised spring, if the pressure exceeds that of the spring it will be forced open and allow the excess pressure to escape.

34
Q

Reducing valve

A

Accepts a high pressure fluid or gas to enter it, the substance expands thereby reducing pressure

35
Q

Non-return valve

A

If the flow of the substance reverses the valve will be forced shut thereby preventing any reversal. Types include flap valve and globe valve

36
Q

Types of pumps

A

Positive displacement pumps

dynamic displacement pumps

37
Q

Methods of displacing fluid

A

Reciprocating(up and down) e.g. piston

Rotary(round and round) e.g. gear

38
Q

Types of positive displacement pump

A

Gearwheel pump

39
Q

Types of dynamic displacement pump

A

Axial pump

Centrifugal pump

40
Q

Bernoulli’s principle

A

As the speed of a moving fluid increases the pressure within the fluid decreases

41
Q

Motors

A

Electric motors convert energy into mechanical motion

42
Q

Pressure and vacuum gauge

A

Fitted to monitor pressure and vacuum, normally bourdon tube gauge

43
Q

Gauge cock

A

Allows a gauge to be isolated from a system

44
Q

Manometers

A

Gives a visual representation of pressure or vacuum, as pressure increases fluids are forced apart, as it reduces fluid levels equalise.

45
Q

Tachometers

A

For measuring the speed of a moving body such as a rotating shaft. It is used to measure the speed of fuel moving through the system which allows you to calculate flow rate and fuel consumption.

46
Q

Types of thermometers

A 
Fixed brass(sheathed or cased)
Standard pocket/oblong
Clock/dial face
47
Q

Thermometer pockets

A

A plug which is screwed into a pipe or machine, the thermometer it made of either standard or fixed brass, it is inserted into the plug.

48
Q

Sheathed or cased thermometers

A

Used in pockets, painted with yellow and black warning stripes

49
Q

Thermometer: Transfer of heat

A

Thermometers are filled with transmission fluid to aid the transfer of heat. Reading it from eye level.

50
Q

Voltage meter

A

Used to measure the potential difference in an electrical circuit

51
Q

Types of filter

A

Metallic

Absorbent

52
Q

Metallic filters

A

Made from wire wool, thin steel plates,
Used to remove coarser particles
When they become blocked they are removed, cleaned and returned

53
Q

Absorbent filters

A

Made from paper, cloth, felt or yarn
remove finer particles
When they are serviced they are replaced and disposed of correctly.
If a filter becomes blocked the pressure will decrease on the discharge side of the filter.

54
Q

Pressure control valves

A

Maintains system pressure at designated set levels

55
Q

Rod gearing

A

Allows valves to be manually shut from a remote location if the location of the valve is inaccessible. It is important to maintain them as they are needed in emergency’s.

56
Q

Pressure relief valve

A

Protects the system from over pressurisation

57
Q

Accumulators

A

Holds potential energy which is exerted upon relatively incompressible fluid to dispense it.

58
Q

Types of accumulators

A

Bladder type

Piston type

ETICC (11 decks)

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