7.9

Question 1

What are the 4 processes to form a pipe?

Answer 1

• cutting
• bending
• flaring
• belling

Question 2

Metal piping is sized by outside diameter measured in?

Answer 2

1/16 of an inch

Question 3

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

Answer 3

True

Question 4

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

Answer 4

• 10%
• to allow for any bends etc

Question 5

What is recommended before bending pipes?

Answer 5

• lightly lubricate

Question 6

2 types of flares for piping are?

Answer 6

• single
• double

Question 7

Explain swage fitting / Harrison-type?

Answer 7

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

Question 8

Explain permaswage fitting?

Answer 8

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

Question 9

Explain belling pipes?

Answer 9

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

Question 10

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

Answer 10

True

Question 11

> 1500 psi

Answer 11

High pressure

Question 12

<1500 psi

Answer 12

Medium pressure lines

Question 13

Suction and return lines?

Answer 13

Low pressure lines

Question 14

Scratches or nicks not deeper than to repair

Answer 14

• not deeper than 10%

Question 15

Up to 600 psi?

Answer 15

• Low pressure

Question 16

Up to 3000 psi?

Answer 16

-Medium pressure

Question 17

> 3000 psi

Answer 17

• High pressure

Question 18

Examples of protective sleeves?

Answer 18

• Heat shrink
• Nylon spiral wrap
• Teflon

Question 19

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

Answer 19

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

Question 20

What are support clamps?

Answer 20

• secure fluid lines to aircraft structure or in engine nacelle

Question 21

The 2 most common encountered clamps?

Answer 21

• rubber cushioned clamp
• plain clamp

Question 22

What are rubber cushioned clamp?

Answer 22

• secure lines subjected to vibration
• prevents chafing

Question 23

What are cushioned clamps used for?

Answer 23

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

Question 24

What are bonded clamps?

Answer 24

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

Question 25

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

Answer 25

• Male thread

Question 26

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

Answer 26

True

Question 27

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

Answer 27

• 60cm (24 inches)

Question 28

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

Answer 28

True