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M6 Resit > 6.6 Pipes and Unions✅(6) > Flashcards

6.6 Pipes and Unions✅(6) Flashcards

1
Q

What material is generally used for low and medium pressure rigid lines

A

aluminium alloy

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2
Q

How is the size of rigid tubing determined

A

outside diameter

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3
Q

The wall thickness of rigid tubing determines what

A

its strength

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4
Q

What fluid line would be identified by red tape with a star

A
  • Fuel
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5
Q

What is the flare angle of a aircraft fitting

A

37*

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6
Q

What is the flare angle of a automotive fitting

A

45*

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7
Q

In a vibration resistant, thin wall tube Harrison flareless fitting, how is the sleeve attached to the tube

A

It is swaged from the inside

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8
Q

What is commonly used as a repair system for repairing hydraulic lines on aircraft

A

swaging fittings (permaswage)

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9
Q

Medium pressure hoses have a seamless inner liner with what

A

a reinforcement of 1 layer of cotton braid and 1 layer of stainless steel

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9
Q

What flexible tube liner is the best to carry petroleum based products

A

Buna-N

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10
Q

What are metal tubing also referred as?

A

Rigid fluid lines

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11
Q

What are flexible hoses made out of

A

Synthetic compounds

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12
Q

Where are rigid tubing used?

A
  • stationary applications
  • relative,y straight
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13
Q

Where are flexible hoses generally used

A
  • vibration areas
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14
Q

Steel fluid lines are increasingly being used as what?

A

Pressure fluid lines

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15
Q

Pressure over 1500PSI is ?

A

High pressure lines

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16
Q

Pressure under 1500PSI is

A

Medium pressure lines

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17
Q

Suction and return lines are

A

Low pressure lines

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18
Q

What are medium and low pressure fluid lines preferably made of?

A

Aluminium alloys for weight saving

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19
Q

In crucial areas what must the pressure lines be made out of

A

Steel

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20
Q

The size of rigid tubing is determined by ?

A

Outside diameter

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21
Q

What are the size increments of rigid tubing

A

1/8inch (3.16mm)

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22
Q

What does the wall thickness of a tube determine

A

It’s strength

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23
Q

All pipes are marked with a part number, drawing number, inspection stamp, test stamp, date of manufacture (T OR F)

A

T

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24
Q

Pre made pipe identification can be stencilled on the pipe or surface ink stamped (T OR F)

A

T

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25
Q

How are fluid lines in aircraft often identified

A
  • by tape or a decal made up of colour codes, words, and geometric symbols
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26
Q

Fluid lines in an oily, hot, or cold environment can use what instead of tape or declas

A

Steel tags

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27
Q

Why is paint used on fluid lines in the engine compartment

A

Tape or decals could be sucked into engine system

28
Q

What is a pipe connector ( union)?

A

Threaded fitting which allows the pipe work to be separated and reconnected

29
Q

What does a flared tube fitting consist of

A
  • a sleeve and a flare nut
30
Q

What are the 2 types of flares used in aircraft piping systems

A
  • single flare
  • double flare
31
Q

What does AN stand for

A

Army & Navy

32
Q

What does AC stand for

A

Air Corps

33
Q

What is the main difference between AN fitting and AC fitting

A

AN has a shoulder between the end of the threads and the flare cone

34
Q

What is another difference between AN fitting and AC fitting

A

AN body length is longer than AC body length

35
Q

What are flared tube fittings made of

A

Aluminium alloy, steel, or copper based alloys

36
Q

AN steel fitting is what colour

A

Black

37
Q

AN aluminium fitting colour is what

A

Blue

38
Q

What are flareless tube fittings

A
  • attach 2 sections of pipe together and commonly have ferrules or a sleeve in them
39
Q

Which flareless fitting is more commonly used today

A

MS (military standard) fitting

40
Q

What 2 materials are flareless fittings made out of

A

Aluminium alloy
Steel

41
Q

How can a flareless fitting made of aluminium alloy be identified

A

Green colour

42
Q

What is the common repair system for repairing hydraulic lines

A

Permaswage fittings

43
Q

Are swaged fittings permanent ?

A

Yes

44
Q

Where are swaged fittings usually used

A

To join hydraulic lines where routine disconnections are not required

45
Q

What is the latest development of a swaged fitting

A

Permalite fitting

46
Q

Flexible lines generally consist of an inner liner which carries the fluid, covered with layers of reinforcement to provide strength (T OR F)

A

T

47
Q

What are the 4 synthetic compounds used in the construction of the inner liner

A
  • Neoprene
  • Buna-N
  • Butyl
  • Teflon
48
Q

What is Neoprene suitable for

A

Petroleum based fluids

49
Q

What is Buna-N suitable for

A
  • carry petroleum products (better suited)
50
Q

What is Butyl suitable for

A
  • carry phosphate ester base hydraulic fluids such as skydrol
51
Q

What is Teflon suitable for

A
  • compatible with nearly every liquid
52
Q

What is Teflon’s operating temperature

A

-240c - 204c

53
Q

Hoses tend to increase in diameter and decrease in length when pressure is applied ( T or F)

A

T

54
Q

The outer cover of a hose is often designed as an integral fire sleeve to provide extra protection (T OR F)

A

T

55
Q

What are lay lines for

A
  • identify the hose
  • indicates if it is twisted or not
56
Q

The size of a flexible hose is determined by its inside or outside diameter

A

Inside diameter

57
Q

Up to 600psi (4000kpa)

A

Low pressure

58
Q

Up to 3000psi (20000kpa)

A

Medium pressure

59
Q

Over 3000 psi (20000kpa)

A

High pressure

60
Q

Can you re use swaged fittings

A

No

61
Q

What should you do when aircraft fluid lines are disconnected or removes

A
  • Use blanking caps
62
Q

What are swivel fittings

A

Allows the coupling and hose connection to rotate, which prevents twisting, kinking and excessive bending

63
Q

Quick disconnect couplings provide self sealing action and can be done by one hand (T OR F)

A

T

64
Q

V-couplings come in 2 types which are

A
  • v retainers
  • v bands
65
Q

When are worm gear hose clamps (jubilee clips) used

A

Secure a hose, while remaining connected to a fitting

66
Q

Worm drive clamps are manufactured from what

A
  • zinc plated steel
  • stainless steel
67
Q

Are v-retainers inexpensive

A

Yes

M6 Resit (10 decks)

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