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Kemble > 7.9 Pipes And Hoses > Flashcards

7.9 Pipes And Hoses Flashcards

1
Q

What is a tubes dimensions determined by?

A

External diameter, wall thickness

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2
Q

What’s is the pressure of a high pressure line

A

Above 1500 psi

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3
Q

What is the pressure of a medium pressure line?

A

Under 1500 psi

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4
Q

What is a low pressure line?

A

Suction and return

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5
Q

What can be used instead of hoses?

A

Flexible metal pipes

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6
Q

What must be taken into account when installing tubes?

A

Vibration and movement

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7
Q

How is a tube cleaned internally?

A

Pressurised air

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8
Q

What are support clamps used for?

A

Securing tubes to the aircraft

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9
Q

What are the two most common clamps?

A

Rubber cushioned clamp, plain clamp

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10
Q

What is an advantage of rubber cushioned clamps?

A

Limit vibration

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11
Q

What material should the cushion clamps use when around liquid?

A

Teflon

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12
Q

What is a bonded clamp used for?

A

Securing hydraulic, fuel and oil lines

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13
Q

How does a flareless tube fitting achieve its seal?

A

Ball bush principle

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14
Q

What is an MS fitting?

A

Sleeve of malleable steel shaped over pipe

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15
Q

What is a Harrison fitting?

A

Sleeve of solid steel which the tube seals onto from inside using swaging

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16
Q

What is required for a flare type fitting?

A

Specialised tool

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17
Q

Why are flare type fittings used in engines?

A

Low vibration

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18
Q

What is the standard flare angle of flare type fittings?

A

37

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19
Q

What are the 2 types of flare fitting?

A

Single, double

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20
Q

What is the diameter of a double flare?

A

3/8 or smaller

21
Q

Why is a double flare better then single flare?

A

Better seal, resistant to shearing/torque

22
Q

What is a permaswage fitting?

A

Steel sleeve squeezed onto pipe using press

23
Q

What affects the tool you use when bending pipes?

A

Diameter

24
Q

When inspecting tubes and pipes what defects do you look for?

A

. Nicks
. Scratches
. Cracks
. Scores
. Bends
. Corrosion

25
Q

Why are hoses uses?

A

Flexible, withstand high vibration

26
Q

What is a low pressure in a hose?

A

Up to 600 psi

27
Q

What is a medium pressure in a hose?

A

Up to 3000 psi

28
Q

What is high pressure in a hose?

A

3000 plus psi

29
Q

What run along the length of the hose?

A

Lay lines

30
Q

What does a lay line indicate?

A

Twisting

31
Q

What do you inspect a hose for?

A

Length, cleanliness, damage

32
Q

What do you check a hose label for?

A

Part number, cure date, assembly date

33
Q

What should hoses be fitted with if they could bend or move?

A

Clamps

34
Q

What colour are lay lines

A

Yellow, red or white

35
Q

What’s are advantages of a pemerswage fitting

A

It can be made quickly in situ, light and gives a good steal

36
Q

What’s a disadvantage of a permerswage fitting

A

The fitting cannot be separated

37
Q

What are the two most common clamps used

A

Rubber cushioned clamp and plain clamp

38
Q

What do rubber cushioned clamps do

A

Secure lines which are subject to vibration

39
Q

Why do we used bonded clamps

A

Has an electrical lead secured to aircraft structural, bonding it. Contains, hydrolic oil or fuel

40
Q

What fitting does a Harrison fitting have

A

Ball bush fitting

41
Q

What are the two methods of making a single flare

A

Impact type - one with hammer
Roller type - no hammer/ preferred one

42
Q

What is the difference between AN fitting and AC (name all An things for this one)

A

37 degrees
Has a recess
Coarser
Blue/black
Longer

43
Q

What is the difference between AN fitting and AC (name all ACthings for this one)

A

35 degrees
No recess
Finer
Grey or yellow
Shorter

44
Q

What is a swage/Harrison fitting suited too

A

Thin walled tubes as almost completely vibration resistant

45
Q

Why would you use a hose

A

to connect stationary to moving parts
Or in high vibration areas

46
Q

When fitting a hose assembly it should be fitted every …..

A

24 inches

47
Q

What is recommended before commencing a bend using a hand tube bender

A

Lightly lubricate the bend point

48
Q

Why does a hose need to slack and what percentage is required

A

They reduce their length by 2-4% and expand when under pressure so 5-8% manufactured longer

49
Q

What system is used to protect hoses assemblies from chafing and temps

A

Protective sleeves
- heat shrink
- nylon spiral wrap
- Teflon

Kemble (39 decks)

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