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M6 > Pipes And Unions > Flashcards

Pipes And Unions Flashcards

1
Q

Aircraft fluid lines

A

Made of metal tubing or flexible hose

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2
Q

Dimensions determined by

A 
External diameter (1/8”)
Wall thickness
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3
Q

Pressure categories

A 
High = 1500 psi
Medium = under 1500 psi
Low = suction and return lines
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4
Q

Pressure tested

A

1-1.5 times normal working pressure

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5
Q

Identification

A 
ATA system 
Stencilled or stamped 
- Drawing Number or Part Number 
- Inspection stamp
- Test stamp 
- Date of manufacture
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6
Q

Two identification systems

A

Colour and symbol

Code(ATA 100 number system)

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7
Q

Fittings

A

Joint tubing to each other and components in various types and sizes to cater various pressures.

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8
Q

Flareless (Ball Bush)

A

Sleeve of malleable steel shaped by pre stressing in a way that it’s cutting edge is pushed over the pipe, securing it.
Not reliable
Cannot be re tightened

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9
Q

Flareless (Harrison)

A

Pipe swaged in the sleeve to form a tight seal
Special tool moulds sleeve and widens pipes
Vibration resistance

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10
Q

Flareless (Permaswage)

A 
Repair fitting for damaged pipes 
Sleeve squeezed on using hydraulic drive tool 
Quick 
Light, good seal 
Cannot be separated
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11
Q

Flared fitting

A 
Complicated to manufacture 
Vibration resistance 
Tool used to make flare 
37 degrees flare is used in aircraft 
If a leak is found dismantle and inspect
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12
Q

Single flare (impact tool)

A

Hammer and impact tool
Plunger hammered in
Plunger rotated
Must be within 1” tube = 0+-0.01”

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13
Q

Single flare (Roll type)

A

Rolling action
Self contained unit
Flare cone turned into pipe
No hammering

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14
Q

Double flare

A

Soft aluminium outside diameter 3/8” or smaller
Smoother, better seal
More durable

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15
Q

Sharp damage

A

Loss of material damage cuts into material to form

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16
Q

Round bottom

A

Loss of material damage at bottom is not sharp edged but rounded

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17
Q

Round bottom impact

A

Dent in the pipe working

18
Q

Hoses

A

Produced by manufacturer

Same id as pipes

19
Q

Requirements for pipes

A

Amount of slack (2-4% diameter increase under pressure)

Never twisted

20
Q

Ratings

A

Low pressure = 600 psi
Medium pressure = 3000 psi
High pressure = over 3000 psi

21
Q

Lay lines

A 
Along length of hose 
Twist indicators (yellow,red,white)
22
Q

Inspection of pipes

A

Designated intervals
Deterioration
Leaks
Mechanical damage

23
Q

Construction of pipes (inner layer)

A 
Chemically compatible 
Neoprene - petroleum based 
Buns N - petroleum based 
Butyl - hydraulic fluids 
Teflon - almost all fluids
24
Q

Construction (reinforcement)

A

Determines strength
Cotton, rayon, polyester
Carbon steel, stainless steel wire braid

25
Q

Construction (outer cover)

A

Rubber impregnated fabric

Stainless steel braids

26
Q

Aeroquip fittings

A

Can be used over and over

27
Q

Cleaning and testing pipes

A

Completed hose assembly must be cleaned out internally with compressed air (blown from both directions alternately) and then proof-tested (normally at 1 1/2 times working pressure) by capping one end.

28
Q

Installation of pipes

A 
Inspect for:
Applicability 
Length 
Cleanliness 
Damage
Check:
Part number 
Cure + assembly dates
29
Q

When fitting a hose you must

A

Not twist it, check the lay lines
Subjected to the minimum of flexing during operation
Supported at least every 24 inches
Not stretched tightly between its fittings
Minimum bend radius is observed

30
Q

Elbow fittings

A

Replace a short bend radius with an elbow fitting, but the largest possible bend radius is still preferred.

31
Q

Protective sleeves

A

Heat shrink
Nylon spiral wrap
Teflon

32
Q

Why is it important to be careful when near early fire sleeves

A

As some contain asbestos

33
Q

Hyd fittings

A

Hydraulic fittings are used throughout the hydraulic system to provide simple connections between hydraulic components and tubing.

34
Q

Fitting materials

A

Aluminium alloy (D)
Cadmium played steel
CRES (S)

35
Q

ID of fittings

A

Letter-number codes; for example, MS21900-4, which is interpreted as follows:
MS
• 21900
• 4
prefix (Military Specification)
design part number (adaptor, flareless tube to AN flared tube) size of fitting in sixteenths of an inch

36
Q

What is the difference between flared and flareless

A

Difference between AN and MS fittings is the manner in which the hydraulic tube fits to the fitting.

37
Q

Flare of an An fitting

A

37 degrees

38
Q

AN-AC

A

37 - 35 degrees

39
Q

Advantages of fuel fittings

A

Easy connection
Speed
Less fuel vapour
Less hazard

40
Q

Types of fuel fittings

A 
Screw 
Instomatic push/pull
Quick thread indicator 
Full grip push/pull 
Ball - lock

M6 (6 decks)

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