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Module 7 > 7.9: Pipes and Hoses > Flashcards

7.9: Pipes and Hoses Flashcards

1
Q

What are pipe forming processes?

A

Cutting
Bending
Belling
Flaring

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2
Q

What are metal piping sized by?

A

Diameter which is measured in 16ths of an inch

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3
Q

What pipe measurement can be bent by hand?

A

Below 1/4 inch

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4
Q

What TPI should a pipe be cut by if a hacksaw is needed?

A

32 TPI

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5
Q

How much longer should pipes be than required to allow for bending?

A

10% longer

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6
Q

What can too much pressure on the cutting wheel cause?

A

Can deform the piping or cause excessive burring

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7
Q

What should be done to steel pipes in terms of marking bends and why?

A

Should arc the bend a little further than the marking on a scale as the pipe springs back a little after bending

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8
Q

Should there be any tension when bending a pipe?

A

No

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9
Q

How widely are pipes bent for small offset angles

A

As wide as possible

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10
Q

How much should the outside flattened portion of a bent pipe be?

A

Not less than 75%

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11
Q

What does the sleeve of flared pipes do?

A

Add strength and support during vibrations

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12
Q

What are the flared angle fittings?

A

37 degrees

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13
Q

What are types of flares?

A

Single
Double

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14
Q

How are single flares formed?

A

Impact type
Flaring cone with a rolling action

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15
Q

What is impact type for flares?

A

Uses a plunger that is driven into the end of the pipe using light hammer blow while rotating the plunger

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16
Q

What is roll type for flares?

A

The preferred method, involving an entirely self contained unit producing a good flare

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17
Q

What type of piping can be double flared?

A

Soft aluminium piping, with an outside diameter of 3/8 inch or smaller

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18
Q

How is a double flare compared to a single flare?

A

It is smoother and more concentric, providing a better seal that is more vibration resistant

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19
Q

What is swage fitting/harrison-type?

A

Good for thin wall pipes and is almost totally vibration resistant

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20
Q

What are permaswage fittings good and bad for?

A

They are good because they can be made quickly and is light and gives a good seal. The disadvantage is it cannot be separated

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21
Q

What is belling?

A

Used for rigid piping lines carrying low pressure fluids or air connecting to rubber hoses by belling the end of the pipe

22
Q

What piping can be belled with a hand belling tool?

A

Outside diameter of 1/4 - 1 inch

23
Q

What do modern aircraft use as materials for extruded pipe material?

A

Various non-corrosive steels, aluminium and titanium alloys

24
Q

How does high quality materials result in less weight?

A

It allows for thinner walls, with a larger inner diameter

25
Q

What are pressure line classifications?

A

High pressure lines: over 1500 psi
Medium pressure lines: below 1500 psi
Low pressure lines: suction and return lines

26
Q

What materials do medium and low pressure lines use in comparison to high pressure lines?

A

Aluminium to save weight while steel ones are for high pressure

27
Q

What are lay lines?

A

Tabs or bands fitted to hoses which show information about the hoses properties

28
Q

What materials can be used with what other materials if a pipe of the same material is not available for repair?

A

Aluminium alloy with CRES or titanium
CRES with titanium (except the pylon)
Titanium with CRES

29
Q

What are the 3 hose pressure classifications ?

A

High pressure - over 3000psi

Medium pressure - up to 3000psi

Low pressure - up to 600psi

30
Q

What percentage of scratches or nicks in aluminium pipes can be repaired?

A

Not deeper than 10% of wall thickness and not in the heel of a bend

31
Q

What are damage limits for hard thin walled CRES and titanium pipes compared to aluminium?

A

CRES and titanium are less than aluminium

32
Q

What is the acceptability for crack or deformity in a flare

A

Any crack or deformity is unacceptable

33
Q

What is the percentage that a dent of the pipe diameter can be accepted?

A

Less than 20% and not in the heel of a bend

34
Q

How are dents repaired in pipes?

A

A bullet of the right diameter is drawn through the pipe to flatten it

35
Q

How much of sharp bottomed surface defects are permitted?

A

A maximum of 5% of the pipes wall thickness and traces of impact

36
Q

How much of round bottomed surface defects are permitted?

A

A maximum of 10% of the wall thickness and traces of impact a maximum of 2%

37
Q

What colours could be on lay lines be and what does it indicate?

A

They could be yellow, red or white stripes and indicates both the hose specification and if the assembly is twisted

38
Q

How are hose assemblies proof tested and with what pressure?

A

By capping one end and using generally 1.5 times the working pressure

39
Q

Before installing a hose, what should be checked?

A

Applicability
Length
Cleanliness
Damage

40
Q

What should the identification tag of a hose be checked for?

A

Part number
Cure date
Assembly date

41
Q

How much support should there consistently be for hoses?

A

Every 60cm (24 in)

42
Q

What is the minimum bend radius determined by?

A

Operating pressure
Hose type
Nominal size

43
Q

What should be used on hoses that become twisted in operation?

A

Clamps

44
Q

What are the materials of sleeving for hoses including?

A

Heat shrink
Nylon spiral wrap
Teflon

45
Q

What compartment should fluid lines never be routed through?

A

Passenger compartments

46
Q

What type of clamps are used to support fluid lines?

A

Rubber cushioned clamps and plain clamps

47
Q

What type of clamps should be used in areas subject to vibration and contamination by fuel or hydraulic fluid

A

Rubber cushioned clamps using teflon, which are highly resistant to deterioration

48
Q

Where are bonded clamps used?

A

Used to secure fuel, oil or hydraulic lines made of metal, with an electrical lead attached to connect the aircraft structure to the ground line

49
Q

Where should pipes be lubricated?

A

The thread on the male fitting
The shoulder of the sleeve

50
Q

Where should lubrication never be applied to on pipes?

A

One female threads or on the contact surface between the sleeve and sealing surface, as it can cause rotation

51
Q

Where should a witness mark be applied once a hydraulic fitting is torqued?

A

A witness mark of red paint 2-4mm wide

Module 7 (13 decks)

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