6.6 - Pipes and Unions

Question 1

The dimension of rigid and flexible pipes are determined by what.

Answer 1

External diameter and wall thickness

Question 2

Low ( suction/return ), medium and high pressure lines operate at what pressure

Answer 2

Low = suction/return
Medium = under 1500 PSI
High = over 1500 PSI

Question 3

All pipes are marked with what information

Answer 3

Part number, inspection stamp, test stamp and date of manufacture.

Question 4

Pipes and hoses are identified by

Answer 4

By a colour, symbol and code system based on the ATA 100 system

Question 5

Hydraulics are identifiable by what colours and symbol

Answer 5

Blue and yellow and black circles

Question 6

Air conditioning is identified by what colours and symbol

Answer 6

Brown and gray

Question 7

Fuel is identified by what colours and symbol

Answer 7

Red and black stars with 4 points

Question 8

De-icing is identified by what colours and symbols

Answer 8

Grey and black triangles

Question 9

Lubrication is identified by what colour and symbol

Answer 9

Yellow and black cubes/squares

Question 10

Fire protection is identified by what colour and symbol

Answer 10

Brown and black cubes/squares slanted at a 45 degree angle

Question 11

2 types of flareless fitting are

Answer 11

MS and Harrison

Question 12

Difference between Harrison and MS is

Answer 12

MS is moulded and Harrison has a ball push fitting.

Question 13

Permaswaging is

Answer 13

A repair for a damaged pipe but is permanent but can be done quickly and in situ

Question 14

Flare type fitting angle

Answer 14

Standard 37 degrees, vehicle type flares 45 degrees

Question 15

How To rectify a leak in flare type fittings

Answer 15

Dismantle and inspect matting surfaces thoroughly for debris and damage. Do not over tighten the joint upon reassembly.

Question 16

Types of flare.

Answer 16

Single and double.

Question 17

Types of single flare.

Answer 17

Impact and roll type

Question 18

Tubing dimension, for a double flare should be

Answer 18

3/8 or smaller

Question 19

A double flare gives what characteristics to a pipe

Answer 19

Makes it more durable and resistant to the shearing effect of torque

Question 20

Low, medium and high pressure hoses operate at what pressures.

Answer 20

Low = up to 600 PSI
Medium = up to 3000 PSI
High = 3000 PSI and above

Question 21

Lay lines are

Answer 21

Coloured lines that run from end to end and should be straight on the pipe once installed and not twisted.

Question 22

Hoses are used in areas such as

Answer 22

Areas with moving parts and high vibration

Question 23

Slack on hoses must compensate for what and by how much

Answer 23

Must compensate for a reduction in length and increase in diameter when under pressure so must have 2 to 4% slack.

Question 24

Hose identification has what information on it.

Answer 24

Manufactures info referring to the spec number, hose size and length in inch or feet, internal diameter.

Question 25

Aeroquip re usable fittings can be

Answer 25

Reused.

Question 26

Hoses must be supported every

Answer 26

24 inches

Question 27

Hoses when installed must be subjected to

Answer 27

The minimum of flex during normal operation

Question 28

Hoses must not be

Answer 28

Stretched between fittings

Question 29

What must be observed when installing hoses

Answer 29

Minimum bend radius

Question 30

Protective sleeves can be made from

Answer 30

Heat shrink, nylon spiral wrap, Teflon

Question 31

2 Standard unions are

Answer 31

AN (flared) and MS (flareless)

Question 32

AN fittings characteristics are

Answer 32

37 degree angle, has a shoulder, coarser thread, blue or black in colour and is longer

Question 33

AC fittings characteristics are

Answer 33

35 degree angle, no shoulder, finer thread, grey or yellow in colour and shorter.

Question 34

AN and AC are not

Answer 34

Interchangeable