7.9 Flashcards

1
Q

What are the 4 processes to form a pipe?

A
  • cutting
  • bending
  • flaring
  • belling
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2
Q

Metal piping is sized by outside diameter measured in?

A

1/16 of an inch

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3
Q

Hacksaw preferably 32 TPI should be used to cut pipes (T or F)?

A

True

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4
Q

When cutting pipes, how much extra should you leave and why?

A
  • 10%
  • to allow for any bends etc
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5
Q

What is recommended before bending pipes?

A
  • lightly lubricate
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6
Q

2 types of flares for piping are?

A
  • single
  • double
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7
Q

Explain swage fitting / Harrison-type?

A
  • moulds a sleeve by widening pipe
  • well suited for thin walled pipes
  • almost totally vibration resistant
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8
Q

Explain permaswage fitting?

A
  • steel sleeve squeezed onto prepared pipe end with hydraulically driven tool
  • can be made quickly, light, good seal
  • cannot be separated (disassembly problem)
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9
Q

Explain belling pipes?

A
  • allows rubber hose to slip over end and held in place by a screw-type hose clamp
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10
Q

High quality materials for pipes result in thinner walls, larger inner diameters (T or F)?

A

True

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11
Q

> 1500 psi

A

High pressure

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12
Q

<1500 psi

A

Medium pressure lines

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13
Q

Suction and return lines?

A

Low pressure lines

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14
Q

Scratches or nicks not deeper than to repair

A
  • not deeper than 10%
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15
Q

Up to 600 psi?

A
  • Low pressure
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16
Q

Up to 3000 psi?

A

-Medium pressure

17
Q

> 3000 psi

A
  • High pressure
18
Q

Examples of protective sleeves?

A
  • Heat shrink
  • Nylon spiral wrap
  • Teflon
19
Q

What do you do when inspecting for aircraft pipes and hoses?

A
  • use suitable torch
  • look for any signs of leaks
  • wear or tear
20
Q

What are support clamps?

A
  • secure fluid lines to aircraft structure or in engine nacelle
21
Q

The 2 most common encountered clamps?

A
  • rubber cushioned clamp
  • plain clamp
22
Q

What are rubber cushioned clamp?

A
  • secure lines subjected to vibration
  • prevents chafing
23
Q

What are cushioned clamps used for?

A
  • areas that are subject to contamination (e.g. fuel, hydraulic fluid etc)
  • highly resistant to deterioration
24
Q

What are bonded clamps?

A
  • secure fuel, oil or hydraulic lines made from metal
  • Has electrical lead so it can be grounded (earth line)
25
Q

Where do you apply lubricant to get the highest possible load on the contact surfaces?

A
  • Male thread
26
Q

Pipes are subject to flexing + expanding due to thermal expansion (T or F)?

A

True

27
Q

When fitting hose assemblies, it’s recommended that they are supported every?

A
  • 60cm (24 inches)
28
Q

Hoses are tested to x1.5 load capacity (T or F)?

A

True