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Part 66 Module 7 > Module 7.9 > Flashcards

Module 7.9 Flashcards

1
Q

how must a pipe be cut without pipe cutters? and to what length?

A

with a 32 TPI hacksaw ad a cut 10% longer than needed to allow for bends

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2
Q

explain the cutting process with pipe cutters

A

align cut mark with the cutting wheel dont apply much pressure as it can deform the pipe. deburr edges by spinning clockwise.

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3
Q

what size pipe can be bent by hand?

A

< 1/4’’

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4
Q

where may it be beneficial to perform the pipe bending?

A

at the repair site

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5
Q

how must pipe bends be made?

A

totally tension free

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6
Q

what are the unacceptable defects of pipe bending?

A

wrinkled or kinked

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7
Q

what are the acceptable limits of a flattened bend?

A

the smaller flat must not be less that 75% of the original size

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8
Q

what is wrinkling caused by?

A

pipe being too hard or too thin

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9
Q

what is kinking caused by?

A

kinking is due to the pipe being bent without internal or external support

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10
Q

what is the flare angle of pipe fittings?

A

37 degrees

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11
Q

what are the two types of flaring methods?

A

-impact type
- roll type

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12
Q

how is a pipe flared using the impact type method?

A

plunger driven into pipe that is secured into the flaring block, with light hammer blows

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13
Q

what is the preferred method of pipe flaring?

A

roll type

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14
Q

single flares are manufactured to close tolerances to ensure what?

A

leak free joints

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15
Q

what pipes can be double flared?

A

smaller than 3/8’’ and made of soft aluminium

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16
Q

what flare provides the best seal and is more resistant to shearing effect of torque?

A

double flare

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17
Q

what are the two tools used to form the double flare?

A

upsetting tool and flaring tool

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18
Q

how is a harrison type connection fitted?

A

a tool inserted which widens the pipe into the fitting

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19
Q

harrison fittings are best suited to what pipes and give what benefits?

A

-thin walled pipes
-almost completely vibration resistant

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20
Q

how is a permaswage fitting fitted and can it be removed?

A

steel sleeve squeezed onto the pipe with a hydraulic tool. Permasage fittings can only be cut out.

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21
Q

what is advantageous about a perma swage fitting?

A

installed quickly, lightweight and gives a good seal.

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22
Q

when would pipe belling be used?

A

rigid piping carrying low pressure fluids or air can be connected to rubber hoses with a screw type hose clamp

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23
Q

what sizes of pipe can be belled by hand?

A

1 inch

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24
Q

how are pipes and hoses marked?

A

identify application and spec by:
-words
-colour
-symbol

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25
Q

what are the benefits of using high quality pipe materials?

A

thinner walls and less flow resistance

26
Q

what are high pressure lines typically made from?

A

steel lines

27
Q

medium and low pressure lines are made of what to save weight?

A

aluminium

28
Q

hoses for engine and hydraulic systems use what plastic?

A

PTFE

29
Q

what are the benefits to the use of PTFE?

A

-chemically inhert
-unaffected by synthetic oils and fluids
-no shelf life
-satisfactory at high fluid and ambient temps

30
Q

PTFE is more vulnerable to what?

A

vulnerable handling

31
Q

how are hoses identified?

A

info printed on hose (lay line) can also be on a tab or band

32
Q

if a pipe of the same material is not available aluminium pipes should be repaired with what?

A

CRES or titanium alloys

33
Q

what are CRES and titanium pipes repaired with?

A

cres should be repaired with titanium
titanium should be repaired with CRES

34
Q

on aluminium, what is the max depth of a scratch or nick allowed? and how is this repaired?

A

10% wall thickness and should be repaired with hand tools

35
Q

what is the acceptable limit of a pipe dent?

A

20%

36
Q

where are defects not allowed?

A

in the heel of a bend

37
Q

what are the damage limits for thin walled CRES and titanium pipes

A

less than aluminium

38
Q

where are cracks or deformities not acceptable?

A

on a flare

39
Q

what are the limits for sharp bottom defects and impact traces?

A

-5% pipe wall thichness for defects
-impact traces not permitted

40
Q

what are the limits for round bottom defects and impact traces?

A

-10% pipe wall thickness for defects
-2% dia. for impact types

41
Q

what are the hose pressure ratings?

A

-low up to 600psi
-medium up to 3000psi
- high over 3000psi

42
Q

what test must be conducted on a hose before service?

A

1.5 times system pressure capping on one end

43
Q

what should be considered when installing a hose?

A

-no twist
-minimum flex
- not stretched
- minimum bend radius
radius observed

44
Q

how often should a hose support be placed?

A

every 60cm

45
Q

how can you replace a short bend radius?

A

an elbow fitting

46
Q

how is the minimum permissable bend radius determined?

A

pressure, hose type and nominal size

47
Q

clamps are used for what?

A

-to stop twisting
- danger from vibration, long lengths or sharp edges.

48
Q

protective sleeves are used to protect from heat and abrasion, what are the different types of sleeving?

A

-heat shrink
- nylon spiral wrap,
- teflon

49
Q

what must inspections look for?

A

any signs of pipe chafing, loose connections, pipe/ hose separation

50
Q

what is a dimension in if it is not stated?

A

inches

51
Q

fluid lines are not allowed to chafe against what?

A

control cables,
structure,
wire bundles,
conduits carrying wires

51
Q

clamps utilising teflon are used when?

A

areas with contamination of fuel or hydraulic fluid

52
Q

what are the two most common clamps?

A

plain clamp
rubber cushioned clamp

53
Q

bonded clamps secure what?

A

fuel oil and hydraulic wires made from metal

54
Q

what is special about bonded clamps?

A

they are gounded to the structure

55
Q

how is an O-ring and thread in O-ring side lubricated

A

specified hydraulic fluid

56
Q

when must lubricant never be applied?

A

on the female thread, and contact surface between sleeve and sealing surface.

57
Q

on a swivel bulkhead fitting, what is done before applying torque to the locknut on the fitting?

A

the pipe sleeve nuts are connected and torqued

58
Q

what shows the pipes ends are correctly aligned

A

the nut spins freely on the thread

59
Q

what must be done before torqueing the end of a fitting?

A

connect and tighten by hand

60
Q

what must be done when attaching a hose?

A

don’t twist and don’t tighten clamps until the installation is finished.

61
Q

what must all runs of pipe have before fittings?

A

at least one bend to absorb forces.

Part 66 Module 7 (16 decks)

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