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Module 1 > Basic Systems > Flashcards

Basic Systems Flashcards

1
Q

What are systems?

A

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

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2
Q

What is an open loop system?

A

The working fluid is consumed e.g. fuel, domestic fresh water

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3
Q

What is a closed loop system?

A

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

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4
Q

What are the three types of tank?

A

Header tank, service tank, drain tank

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5
Q

What is a header tank for?

A

Reservoir to top up a system

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6
Q

What is a service tank for?

A

Supply of clean, water-free fuel

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7
Q

What is a drain tank for?

A

Collects oil returning from a system

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8
Q

What are the three types of gauge?

A

Contents gauge, gauge glass, sounding tube

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9
Q

What is a contents gauge for?

A

A clock/dial for how much fluid is in a tank

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10
Q

What is a gauge glass for?

A

Visual indication for tank level (press button to read)

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11
Q

What is a sounding tube for?

A

Used to measure the depth of liquid in a tank (dip tape and conversion chart)

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12
Q

What are strainers?

A

Used to remove large course particles, usually metal plates with holes in or a wire basket. Usually washable and re-usable

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13
Q

What does the type of pipework depend on?

A

Service being supplied (the fluid);
Operating temperature and pressures;
Other types of material used in the system

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14
Q

What are the 5 types of pipe?

A

Phosphor bronze
Copper
Copper nickel
Brass
Plastic

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15
Q

What are phosphor bronze pipes used for?

A

High pressure salt water (HPSW)

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16
Q

What are copper pipes used for?

A

Domestic fresh water

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17
Q

What are copper nickel pipes used for?

A

Lub oil

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18
Q

What are brass pipes used for?

A

Castings (valves, couplings, junctions, taps etc.)

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19
Q

What are plastic pipes used for?

A

Sewage/waste systems and pre-wet

20
Q

What does the type of seal used depend on?

A

System pressure;
The fluid being used;
Temperatures involved

21
Q

What are the 4 types of seal?

A

Gaskets
Mechanical seals
Keeler ring couplings
Gland packing

22
Q

What are gaskets?

A

Used to create a seal between two flat surfaces. Can be made from various materials, including: Non Asbestos Fibre (NAF), paper, leather, cork, copper, rubber

23
Q

What are mechanical seals used for?

A

Used on rotating components such as pump shafts

24
Q

What are keeler ring couplings used for?

A

Used on high pressure air system pipework connections

25
Q

What is gland packing?

A

Made of silicone, wool or wax depending on fluid type, pressure and temperature

26
Q

What is the purpose of valves?

A

To provide a method of controlling flow or pressure of a fluid or to provide a means of isolating various systems or components

27
Q

What are the types of valve

A

Globe valve
Gate valve
Flap valve
Saunders valve
Ball seated cock
Relief valve
Reducing valve
Non-return valve
Pressure control valve
Remote operation valve

28
Q

What are relief valves?

A

Used to prevent over pressurisation (prevents something bursting or being damaged if pressure gets too high by returning excess pressure back to the tank or before a pump)

29
Q

What are reducing valves?

A

Used to reduce pressure for part of a system (rest of system still at higher pressure)

30
Q

What are non-return valves?

A

Prevents reverse flow (common types - piston type and flap valve)

31
Q

What are pressure control valves?

A

Maintains pressure in a system at a set level, monitors the outlet pressure from the valve (to adjust the valve position as required)

32
Q

What are remote operation valves (ROV)?

A

Rod gearing to manually open or close a valve from another location or automated e.g. a solenoid operated valve

33
Q

What are the two types of pump?

A

Positive displacement pumps and dynamic displacement pumps

34
Q

What are positive displacement pumps?

A

Less flow, increases pressure e.g. gearwheel pump, rotary pump

35
Q

What are dynamic displacement pumps?

A

Large flow, low pressure e.g. centrifugal pump and axial pump

36
Q

What is a motor used for?

A

Converts electrical energy into mechanical motion to drive a pump

37
Q

What types of system indicators are used?

A

Pressure and vacuum gauges - bourdon tube and manometer;
Tachometer;
Thermometer;
Flow meters;
Voltage meters

38
Q

What are bourdon tubes?

A

Tube extends as pressure increases, moving a needle round a dial

39
Q

What is a manometer?

A

U Tube - pressure increase pushes liquid round the U bend

40
Q

What is a tachometer?

A

Measures rotational speed (e.g. speed of a motor or pump)

41
Q

What are the three types of thermometer?

A

Fixed brass
Standard pocket
Clock/dial face

42
Q

What are thermometer pockets?

A

A plug fitted to systems to screw in a fixed brass thermometer. Filled with oil to aid heat conduction

43
Q

What are filters?

A

Used to remove small fine particles. Type used depends on system/fluid

44
Q

What are the two types of filters?

A

Metallic - wire wool, steel plates and gauze screens. Reusable, can be washed and refitted when blocked
Absorbent - fabrics, felt, yarn, paper. Not reusable

45
Q

What are accumulators?

A

They store potential energy (pressure) which is released as required, also used as pulsation - bladder (bag) type and piston type are the most common

46
Q

What is Bernoulli’s Principle?

A

As the speed of a moving fluid increases, the pressure within the fluid decreases. Narrowing pipe: speed increases, pressure decreases. Widening pipe: speed decreases, pressure increases.

Module 1 (2 decks)

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