Hydraulics fluids

Question 1

what is hydrodynamics?

Answer 1

The study of liquids in motion

Question 2

Pascal laws

Answer 2

• Pressure on a confined uncompressible liquids transmitted equally in all direction
• Neither shape nor the volume of a container affects the pressure.

Question 3

Viscosity

Answer 3

Resistance to flow

Question 4

Chemical Stability

Answer 4

It is the liquid’s ability to resist oxidation and deterioration for long periods

Question 5

Flash Point

Answer 5

Flash point is the temperature at which a liquid gives off vapor in sufficient quantity to ignite momentarily or flash when a flame is applied

Question 6

Fire Point

Answer 6

Fire point is the temperature at which a substance gives off vapor in sufficient quantity to ignite and continue to burn when exposed to a spark or flame

Question 7

The three principal categories of hydraulic fluids a

Answer 7

• Mineral based fluids - MIL-H-5606, MIL-PRF-5606H).
• Synthetic Hydrocarbon based fluids - MIL-PRF-87257B
• Phosphate ester based fluids - Skydrol®, Exxon Hy

Question 8

Systems that use mineral based fluids id (MIL-H-56) may be flushed whit?

Answer 8

with Naphtha, Varsol, or Stoddard solvent.mineral-base hydraulic fluid

Question 9

Nitrile,Buna-N, Neoprene, Fluorosilicone seals and hoses may be used with what type of hydraulic fluid?

Answer 9

Mineral oil-based hydraulic fluids and

Synthetic Hydrocarbon based fluids

Question 10

MIL-H-5606 and MIL-PRF-5606H are compatible and mixable?

Answer 10

yes

Question 11

Mineral-based hydraulic fluids and Synthetic Hydrocarbon based fluids color ?

Answer 11

red

Question 12

pros and cons of Synthetic Hydrocarbon based fluids - MIL-PRF-87257B

Answer 12

-Pros : fire-resistant
-Cons: high viscosity at low temperature. It is generally
limited to –40

Question 13

MIL-H-87257 is a development of -83282 to improve ?

Answer 13

low temperature viscosity and It is compatible with all of the cleaners and materials used with 5606 fluid

Question 14

Phosphate Ester based fluids are used in most commercial transport category aircraft and are extremely fire-resist, name the main suppliers?

Answer 14

Eastman (Skydrol) and ExxonMobil

Question 15

what types of seals and hoses may be used with Phosphate ester based fluids ?

Answer 15

Butyl Rubber, Ethylene Propylene or Teflon

Question 16

Systems that use phosphate ester fluid may be cleaned with ?

Answer 16

Stoddard solvent, methyl-ethyl-ketone (MEK) or isopropyl alcohol

Question 17

Phosphate Ester based fluids types ?

Answer 17

Type:IV:Exxon , HyJet IV-plus 500B4
Type IV/V: Skydrol LD4,Skydrol V
Type V: Skydrol PE5, Exxon HyJet 5

Question 18

Phosphate Ester based fluids color

Answer 18

purple

Question 19

Mineral based fluids temperature range

Answer 19

-54 to 90 c

Question 20

Synthetic Hydrocarbon MIL-PRF 83282D temperature range

Answer 20

-40 to 205 c

Question 21

Synthetic Hydrocarbon MIL-PRF 87257B temperature range

Answer 21

-54 to 135 c

Question 22

Mineral based fluids brand names

Answer 22

-MIL-H-5606A:
Mobil Aero HFA
AeroShell fluid 4
Royco 756

-MIL-PRF-5606H
Mobil Aero HF
AeroShell Fluid 41

Question 23

Synthetic Hydrocarbon brand names

Answer 23

-MIL-PRF 83282D:
 Aeroshell fluid 31
 Royco 782
-MIL-PRF 87257B:
 AreoShell Fluid 51