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M6 > Pipes And Unions > Flashcards

Pipes And Unions Flashcards

1
Q

What are aircraft fluid lines made of

A

Metal tubing or flexible hose

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2
Q

What are the 3 parts of tubes

A

Two end fittings

Tube

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3
Q

What are the dimensions of tube determined by

A

The external diameter (1/8)

Wall thickness

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4
Q

What is the high pressure of a rigid pipe

A

Over 1500 psi

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5
Q

What is the medium pressure of a rigid pipe

A

Under 1500 PSI

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6
Q

What is the low pressure of a rigid pipe

A

Suction and return lines

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7
Q

How is a pipe identified

A

Stencilled or stamped

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8
Q

What is on a pipe stamp

A 
Drawing number or part number 
Inspection stamp 
Test stamp 
Date of manufacture 
Identification system
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9
Q

What are the two identification systems

A

Colour / symbol

Code

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10
Q

What is a blue / yellow identification label

A

Hydraulic

Repreating circle

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11
Q

What is a grey identification label

A

PHDAN

Physical dangerous substance

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12
Q

What is a red identification label

A

Fuel

Repeating star

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13
Q

What is a green identification label

A

Oxygen

Repeating rectangle

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14
Q

What are the 2 pipe connector categories

A

Flareless

Flared

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15
Q

What is a MS fitting flareless

A

Ball bush principle
The sleeve or O-ring of malleable steel is shaped by pre-stressing in such a way that its inner cutting edge is pushed over the pipe to seal it. At the same time the lip of the seal is pushed into the cone of the fitting and forms a seal line. During this the tube must, in principle, be on the stop support.
Don’t over tighten

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16
Q

What is a Harrison fitting

A

Flareless
Ball bush fitting
Pipe swaded form a tough seal
Special tools used

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17
Q

What are the advances of Harrison fitting

A

Easy to handle
simple tooling
Vibration resistant

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18
Q

What is a permaswage fitting

A

A repair method of repairing damaged pipes

Sleeve squeezed on using hydogen driven tool

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19
Q

What is the advantages of permawage fitting

A

Light weight
Gives a good seal
Quick

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20
Q

What is the disadvantage of permaswage fitting

A

Can not be separated

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21
Q

two types of flare used in aircraft tubing systems:

A

Single flare

Double flare

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22
Q

What is the aircraft flare angle

A

37

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23
Q

What is a vehicle type flare angle

A

45

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24
Q

What must you have before you can flare

A

A clear surface

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25
Q

What to do if you see a lean in flare

A

Dismantle and check

Don’t over tighten

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26
Q

What is an impact tool used for

A

Single flare
Plungerd or hammered in
Plunger rotated to give 37 angle

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27
Q

What is a rolling action

A 
Creates a single flare 
A self contained unit 
No hammering 
Flaring cone turned inti to pipe 
Preferred
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28
Q

What sized aluminium tube can be flared

A

3/8 inch or smaller

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29
Q

What are the advantages of double flare

A

Smother
More concentric
Gives a better seal
More durable

30
Q

What is sharp bottom damaged pipe

A

Loss of material damage cuts into material to form

Scratches

31
Q

What is round bottom damage

A

Loss of material damage at the bottom is not shap edges but rounded

32
Q

What is round bottomed impact damage

A

Dent in the pipe walling

33
Q

What are the requirements of flexible hoses

A

An amount of slack required
Length reduces by 2-4 under pressure
Not twisted when tightened

34
Q

What are the uses of flexible house

A

Connect stationary to dynamic

35
Q

What are the rating of flexible house

A

Low up to 600 psi
Medium up to 3000 psi
High 3000 plus psi

36
Q

What is a lay line

A

Along the length of flexible hose
Twist indicator
Yellow red or white

37
Q

What is the inner hose

A

Carries fluids and must be chemically compatible

38
Q

What mater inner house used for petrol

A

Neoprene and buna-N

39
Q

What is the inner layer fir hydraulic

40
Q

What are hose reinforces with

A 
Cotton 
rayon 
polyester 
carbon steel 
stainless steel 
wire braid 
Protective outer cover
41
Q

What do you inspect in a hose

A

Applicable
Length
Cleanliness
Damage

42
Q

What do you check in hose

A

Part number
Cure and assembly
Clensily ness

43
Q

When must hose be supported

A

At least every 24 inch

44
Q

What can replace a pipe bend

45
Q

What type of hose bend is preferred

A

A large bend

46
Q

What protective sleeves are used

A

Heat shrink
Nylon spiral wrap
Teflon

47
Q

What is a D on a hydraulic fittings

A

Aluminium alloy

48
Q

What is a union with no marking

A

Cadmium plating

49
Q

What is an S on a union

50
Q

What angle does a AN fitting have

51
Q

Dose a AN fitting have a shoulder

52
Q

What types of thread dose a AN fitting have

53
Q

What colour is an AN fitting

A

Blue or black

54
Q

What length of body dose a AN fitting have

55
Q

What angle is a AC fitting

56
Q

Dose a AC fitting have a shoulder

57
Q

What type of thread does a AC fitting have

58
Q

What colour is an AC fitting

A

Grey or yellow

59
Q

What type of body length does a AC fitting have

60
Q

What is the most common AC or AN

61
Q

What are the adavangas of fuel fittings

A

Easy
quick
Less fuel vapour
less hazard

62
Q

When is flexible hose used

A

When it is subject to vibration

63
Q

What type of tube is Harrison fitting suited for

A

Thin walled

64
Q

How do you double flare

A

Inserted into the flaring tube
The upsetting tool is inserted
Initial upset is formed
A flaring tool is inserted into and hammered till a 2nd flare is formed

65
Q

What happens If a damaged pipe is not described in the manual

A

The damage is not permitted

66
Q

Why is a Teflon tube used

A

Compatible with almost every fluid carried

67
Q

What is hose outer cover made of

A

Rubber impregnated fabric or stainless steel braid

68
Q

What is MS

69
Q

What is AN

70
Q

What is the difference between AN and MS fittings

A

The manner in which the hydraulic tube fits to the fitting.

71
Q

What are the advantage of quick disconnect couplings

A

Ease
Speed
Elimate vapour loss

71
Q

How do you know when screw type is engaged

A

Clicking noise

M6 (13 decks)

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