7.9 Flashcards
How are the dimensions determined
External diameter
Wall thickness
What increments are the dimensions in
1/8
What metal should you use in areas of high pressure of chance of impact
Steel (landing gear, fire proof needed areas)
What are the pressure for a rigid pipe
Low pressure = suction and return line
Medium = up to 1500psi
High = over 1500psi
What are the medium and low pipes made from
Aluminium alloy
What is the bend radius dependent on
Material type
Wall thickness
Outer diameter
How to you clean and proof test a pipe
Cleaned by compressed air
Then proof tested by 1 1/2 times working pressure with end cap on.
Only by specialist
When installing a bonded clamp what must you ensure
Any paint or anodising is removed from where clamp is fitted for electrical continuity
What do flareless fittings rely on
Ball bush principle
What are the two types of flareless fitting and which one is preferred
Ms
Harrison - preferred
Why is Harrison preferred
Ease of fitting
Vibration resistant
What is the angle of a flared fitting
37 degrees
What should you not do if you suspect a leak
Over tighten it
What are the two types of flares
Single
Double
How can you from a single flare fitting and which one is preferred
Impact
Roller - preferred
What are the characteristics of an AN fitting
37
Recess
Coarse
Blue/black
Longer
What are the characteristics of an AC fitting
35
No recess
Fine
Grey/yellow
Shorter
What should you use a double flare on
Aluminium 3/8 or smaller
What is better about a double flare
Gives a smoother more concentric seek
What are the advantages of a permaswage fitting
In situ
Quick and easy
Tight seel
What are the disadvantages of a permaswage fitting
Once it’s in can it be removed
What should you do before bending a radius
Lubricate the bending point
What can aluminium alloy be repaired with if absolutely necessary
Titanium alloy tube
What can titanium alloy be repaired with if absolutely necessary and what do you have to take into consideration
CRES tube
Weight penalty
If there is a 5% wall defected what’s it called
Sharp bottom
If there is a10% wall defected what’s it called
Round bottom
What are the pressures of hoses
Low = up to 600psi
Med = up to 3000psi
High = over 3000psi
What do lay lines do and what colours are they
Indicate twisting
Red, yellow, white
What is the name of the reusable fitting
Aeroquip
What should you do before installation
Cleanliness
Damage
Applicability
Length
At what length should the hose be supported
Ever 24 inches
What can you do if the bend radius is too short
Replace the bend radius with a elbow bend fitting
What is the best protective sleeve and why
Teflon
Because it is compatible with most things
How can you detect slippage
By witness marks after it has been torqued
