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Module 7: Maintenance Practices (B1) > 7.9: Pipes and Hoses > Flashcards

7.9: Pipes and Hoses Flashcards

1
Q

Pipe flaring angle is ____ deg.

A

Pipe flaring angle is 37 Deg.

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2
Q

Checking a hose after installation. Flex through _________________________

A

Checking a hose after installation. Flex through normal range of motion plus 15^

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3
Q

Ball testing a flexible hose __% of bore diameter

A

Ball testing a flexible hose 80% of bore diameter

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4
Q

Pressure testing a hose. how many times working pressure?

A

Pressure testing a hose. 1.5 to 2 times the maximum working pressure

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5
Q

What are the international pipe markings on the following:

  • Water pipeline =
  • Fire protection =
  • Fuel =
  • Hydraulic =
A
  • Water pipeline = chevrons
  • Fire protection = Diamonds
  • Fuel = Star
  • Hydraulic = Circle
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6
Q

What is the expansion allowance of a pipe?

A

3%

Straight hoses must be 3% longer than between the ends of the component

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7
Q

What is the max resistance allowed on a flexible pipe ? (resistance test)

A

Max resistance on a flexible hose is 0.05 ohm

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8
Q

Flareless pipe coupling (procedure 3 steps)

A

Flareless pipe coupling

  1. The sleeve must bite into the pipe wall
  2. Only preset on the first assembly. Preset by rotating the tool nut. Turn the Nut ONCE
  3. May rotate slightly when inspected, but not laterally
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9
Q

AN flared pipe end fitting is coloured ____________

A

AN flared pipe end fitting is coloured blue or black

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10
Q

How far must pipe/flexible pipe be away from moving parts?

A

3/4 of an inch away from moving parts

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11
Q

Scratch on a pipe must be no more than ____% thickness

A

Scratch on a pipe must be no more than 10% thickness

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12
Q

Dent on a pipe must be no more than __% thickness

A

Dent on a pipe must be no more than 20% thickness

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13
Q
A

Options B. 1.5 times the working pressure

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14
Q
A

Options A. by flexing through the normal operating range plus 15^

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15
Q
A

Option B. it may still be serviceable

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16
Q
A

Option C: as supplied

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17
Q
A

Option A: Unserviceable and should be replaced

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18
Q
A

Option A: as supplied

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19
Q
A

Option C: 3% longer than the distance between the fittings

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20
Q
A

Option C: ball of 90% of bore of end fittings passes freely under own weight

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21
Q
A

Option C: 1.5 times maximum working pressure

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22
Q
A

Option B: warning symbol

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23
Q
A

Option A: chevrons

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24
Q
A

Option C: diamonds

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25
Option B: varnish
26
Option B: zig zag line
27
Option C: rectangles
28
Opton C: 0.05 ohm
29
Option A: 90% of the diameter of the end fittings
30
Option B: a white line painted the full length of the hose to indicate any twist in the hose
31
Option B: as supplied
32
Option A: Sleeve and nut
33
Option C: 32 degrees
34
Option C: if damage is no more than 10%
35
Option A: allow for expansion and contraction due to heat and absorb vibration
36
Option B: A.N
37
Option B: using a corrugated strip
38
Brown
39
Bonding check
40
Aluminium alloy In general for pressure up to 1800 psi aluminium pipes are used, but for carrying oxygen, stainless steel is used above 1800 psi
41
Teflon
42
The type of fluid inside the pipe
43
1.5x normal pressure for 2 minutes
44
is possible on pipe that is less than ½'' in diameter
45
a piece should be cut slightly larger to accommodate for the flare
46
It cannot be used with oxygen systems as it is a fire hazard
47
fill pipes prior to bending
48
1/16
49
2 flats
50
the centre of the bore at the nipple extremity
51
Lubricant
52
slightly smaller than the threaded bore of the pipe connector
53
Wrinkles will occur on the inside of the bend
54
51 ½ inches Hose should be 3% longer than needs to be, to accommodate fuselage expansion so 1% of 50 is 0.5 and so 3% extra is 1.5, therefore 51.5 inches minimum hose length
55
Zero, you cannot bent pressure pipes in the hands
56
achieved by self-bonding that must be checked after installation
57
does not make any difference to possibility of pipe to work harden
58
37 degrees
59
a or c UNDER REVIEW
60
ball of 80% of bore of end fittings passes freely under own weight
61
1 ½ to 2 times maximum working pressure
62
warning symbol
63
c) 80% of the diameter of the end fittings
64
QUESTION UNDER REVIEW
65
Question UNDER REVIEW
66
Question UNDER REVIEW
67
Question Under Review
68
a) must protrude slightly - Answer under review ‘’To produce a flare with this tool the clamping screw at the end of the tool is loosened so that tubing can be inserted through the correct sized hole. About 6.35mm (¼'') of the tubing is extending above the clamping blocks…''
69
b) must bite into the pipe wall Flareless pipe coupling 1. The sleeve must bite into the pipe wall 2. Only preset on the first assembly. Preset by rotating the tool nut. Turn the Nut ONCE 3. May rotate slightly when inspected, but not laterally
70
a) only on first assembly Flareless Pipe Coupling: 1. The sleeve must bite into the pipe wall 2. Only preset on the first assembly. Preset by rotating the tool nut. Turn the Nut ONCE 3. May rotate slightly when inspected, but not laterally
71
b) may rotate slightly when inspected Flareless Pipe Coupling: 1. The sleeve must bite into the pipe wall 2. Only preset on the first assembly. Preset by rotating the tool nut. Turn the Nut ONCE 3. May rotate slightly when inspected, but not laterally
72
a) Nut Flareless Pipe Coupling; 1. The sleeve must bite into the pipe assembly 2. Only preset on the first assembly. Preset by rotating the tool nut. Turn the Nut ONCE 3. May rotate slightly when inspected, but not laterally
73
b) oxygen - Question under review
74
c) blue or black
75
(a) The diameter of the outer braid of the hose Answer under review
76
c) Indicate if the pipe is installed straight and not twisted
77
Question under review
78
c) At least 3% greater than the length required
78
c) At least 3% greater than the length required
79
Question under review
80
(b) Flexible fitting which can be extended if required ( ANSWER UNDER REVIEW) ‘’A banjo coupling is used wherever a fluid tight seal is required, but relative (rotational) movement between the fitting and hose is also required (such as on some brake units) The fitting consists of a bolt, drilled longitudinally, and partly radially. A ring (the ‘banjo’) with a hollowing on the inside accepts the fluid via the bolt's drillings.
81
(b) A visual indication of correct installation only (Answer under review)

Module 7: Maintenance Practices (B1) (20 decks)

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