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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
Examples of seals
Mechanical seals Keeler ring couplings Gland packing
26
Purpose of valves
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
Types of valve
``` Globe valve Gate valve Flap valve Saunders valve Pressure relief valve Ball seated cock Reducing valve Non-return valve ```
28
Globe valve
Can be altered to provide a variety of services such as being a non-return valve or two way flow
29
Gate valve
Used mostly on large bore systems such as ventilation.
30
Flap valve
Simple type of non-return valve
31
Saunders valve
Valve fitted with a rubber diaphragm, used in water and fuel systems
32
Ball seated cock
Has a hole through it so that when the valve is turned 90 degrees it lines up with the flow
33
Pressure relief valve
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
Reducing valve
Accepts a high pressure fluid or gas to enter it, the substance expands thereby reducing pressure
35
Non-return valve
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
Types of pumps
Positive displacement pumps | dynamic displacement pumps
37
Methods of displacing fluid
Reciprocating(up and down) e.g. piston | Rotary(round and round) e.g. gear
38
Types of positive displacement pump
Gearwheel pump
39
Types of dynamic displacement pump
Axial pump | Centrifugal pump
40
Bernoulli's principle
As the speed of a moving fluid increases the pressure within the fluid decreases
41
Motors
Electric motors convert energy into mechanical motion
42
Pressure and vacuum gauge
Fitted to monitor pressure and vacuum, normally bourdon tube gauge
43
Gauge cock
Allows a gauge to be isolated from a system
44
Manometers
Gives a visual representation of pressure or vacuum, as pressure increases fluids are forced apart, as it reduces fluid levels equalise.
45
Tachometers
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
Types of thermometers
``` Fixed brass(sheathed or cased) Standard pocket/oblong Clock/dial face ```
47
Thermometer pockets
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
Sheathed or cased thermometers
Used in pockets, painted with yellow and black warning stripes
49
Thermometer: Transfer of heat
Thermometers are filled with transmission fluid to aid the transfer of heat. Reading it from eye level.
50
Voltage meter
Used to measure the potential difference in an electrical circuit
51
Types of filter
Metallic | Absorbent
52
Metallic filters
Made from wire wool, thin steel plates, Used to remove coarser particles When they become blocked they are removed, cleaned and returned
53
Absorbent filters
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
Pressure control valves
Maintains system pressure at designated set levels
55
Rod gearing
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
Pressure relief valve
Protects the system from over pressurisation
57
Accumulators
Holds potential energy which is exerted upon relatively incompressible fluid to dispense it.
58
Types of accumulators
Bladder type | Piston type

ETICC (11 decks)

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