M6.6 Flashcards
Pressures over 1500 PSI (105 bar)?
High
Under 1500 PSI (105 bar)?
Medium
Suction and return lines?
- low pressure lines
A flared tube consists of?
- Sleeve
- Flared nut
Aircraft fittings have a flare angle of?
37*
Flared tube fittings are identified by either?
- AN army & navy (blue/black)
- AC air cops (grey/yellow)
Size of rigid tubing is determined by?
-outside diameter in increments of 1/8inch
-part numbers marked in 1/16 inch increments
Why is double flare better than single flare?
- smoother
- more concentric
- provides better seal
- more durable
- resistant to shearing effect of torque
What are flared-tube fittings made of?
- aluminium alloy
- steel
- copper-based alloys
What are flareless tubes?
-attach 2 sections of pipe together which would have ferrules or a sleeve
-when tightened, ferrule/sleeve is compressed between nut
-creates a strong leak free joint
Fitting consists of 3 parts?
-Tube
-Sleeve
-nut
What is a swaged fitting?
- permanent connection that is maintenance free
-used where routine disconnections are not required
What are permalite fittings?
-deforming fitting into the tube that is joined by moving a ring/component axially.
Why would you use a flexible fluid line?
-vibration
-moving parts
What are the 4 synthetic compounds used in the construction of the inner liner?
-Neoprene
-Buna-N
-Butyl
-Teflon
Neoprene is suitable for?
Petroleum-based fluids
Buna-N is suitable for?
-Petroleum based products (better than neoprene)
Butyl is suitable for?
Phosphate ester-base hydraulic fluids (e.g. skydrol)
Teflon is suitable for?
-compatible with nearly every liquid used
- Broad temp range (-240c to 240c)
Size of flexible hose is determined by?
-inside diameter and measured in increments of 1/16 inch
Up to 4000kPa (600psi) on a flexible hose?
Low pressure
Up to 20000kPa (3000psi) on a flexible hose?
- medium pressure
Over 20000kPa (3000psi) on a flexible hose?
High pressure
Can you re-use swaged fittings?
No