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