7.9: Pipes and Hoses Flashcards
Pipe flaring angle is ____ deg.
Pipe flaring angle is 37 Deg.
Checking a hose after installation. Flex through _________________________
Checking a hose after installation. Flex through normal range of motion plus 15^
Ball testing a flexible hose __% of bore diameter
Ball testing a flexible hose 80% of bore diameter
Pressure testing a hose. how many times working pressure?
Pressure testing a hose. 1.5 to 2 times the maximum working pressure
What are the international pipe markings on the following:
- Water pipeline =
- Fire protection =
- Fuel =
- Hydraulic =
- Water pipeline = chevrons
- Fire protection = Diamonds
- Fuel = Star
- Hydraulic = Circle
What is the expansion allowance of a pipe?
3%
Straight hoses must be 3% longer than between the ends of the component
What is the max resistance allowed on a flexible pipe ? (resistance test)
Max resistance on a flexible hose is 0.05 ohm
Flareless pipe coupling (procedure 3 steps)
Flareless pipe coupling
- The sleeve must bite into the pipe wall
- Only preset on the first assembly. Preset by rotating the tool nut. Turn the Nut ONCE
- May rotate slightly when inspected, but not laterally
AN flared pipe end fitting is coloured ____________
AN flared pipe end fitting is coloured blue or black
How far must pipe/flexible pipe be away from moving parts?
3/4 of an inch away from moving parts
Scratch on a pipe must be no more than ____% thickness
Scratch on a pipe must be no more than 10% thickness
Dent on a pipe must be no more than __% thickness
Dent on a pipe must be no more than 20% thickness
Options B. 1.5 times the working pressure
Options A. by flexing through the normal operating range plus 15^
Option B. it may still be serviceable
Option C: as supplied
Option A: Unserviceable and should be replaced
Option A: as supplied
Option C: 3% longer than the distance between the fittings
Option C: ball of 90% of bore of end fittings passes freely under own weight
Option C: 1.5 times maximum working pressure
Option B: warning symbol
Option A: chevrons
Option C: diamonds
Option B: varnish
Option B: zig zag line
Option C: rectangles
Opton C: 0.05 ohm
Option A: 90% of the diameter of the end fittings
Option B: a white line painted the full length of the hose to indicate any twist in the hose
Option B: as supplied
Option A: Sleeve and nut
Option C: 32 degrees
Option C: if damage is no more than 10%
Option A: allow for expansion and contraction due to heat and absorb vibration
Option B: A.N
Option B: using a corrugated strip
Brown
Bonding check
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
Teflon
The type of fluid inside the pipe
1.5x normal pressure for 2 minutes
is possible on pipe that is less than ½’’ in diameter
a piece should be cut slightly larger to accommodate for the flare
It cannot be used with oxygen systems as it is a fire hazard
fill pipes prior to bending
1/16
2 flats
the centre of the bore at the nipple extremity
Lubricant
slightly smaller than the threaded bore of the pipe connector
Wrinkles will occur on the inside of the bend
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
Zero, you cannot bent pressure pipes in the hands
achieved by self-bonding that must be checked after installation
does not make any difference to possibility of pipe to work harden
37 degrees
a or c
UNDER REVIEW
ball of 80% of bore of end fittings passes freely under own weight
1 ½ to 2 times maximum working pressure
warning symbol
c) 80% of the diameter of the end fittings
QUESTION UNDER REVIEW
Question UNDER REVIEW
Question UNDER REVIEW
Question Under Review
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…’’
b) must bite into the pipe wall
Flareless pipe coupling
- The sleeve must bite into the pipe wall
- Only preset on the first assembly. Preset by rotating the tool nut. Turn the Nut ONCE
- May rotate slightly when inspected, but not laterally
a) only on first assembly
Flareless Pipe Coupling:
- The sleeve must bite into the pipe wall
- Only preset on the first assembly. Preset by rotating the tool nut. Turn the Nut ONCE
- May rotate slightly when inspected, but not laterally
b) may rotate slightly when inspected
Flareless Pipe Coupling:
- The sleeve must bite into the pipe wall
- Only preset on the first assembly. Preset by rotating the tool nut. Turn the Nut ONCE
- May rotate slightly when inspected, but not laterally
a) Nut
Flareless Pipe Coupling;
- The sleeve must bite into the pipe assembly
- Only preset on the first assembly. Preset by rotating the tool nut. Turn the Nut ONCE
- May rotate slightly when inspected, but not laterally
b) oxygen - Question under review
c) blue or black
(a) The diameter of the outer braid of the hose
Answer under review
c) Indicate if the pipe is installed straight and not twisted
Question under review
c) At least 3% greater than the length required
c) At least 3% greater than the length required
Question under review
(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.
(b) A visual indication of correct installation only (Answer under review)
