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Hydraulics > Filtration > Flashcards

Filtration Flashcards

1
Q

What are the 4 purposes of a filter?

A

Protect
Clean
Condition
Extend oils life

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2
Q

What do harmful contaminates do?

A

Reduce efficiency and cause 70% of hydraulic failures

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3
Q

What are the 4 ways contamination effects hydraulic systems?

A

Increased internal leakage- decreases ability to control flow and pressure. Excess heat

Corrosion of systems

Sticking of parts due to sludge or silting

Seizure of parts

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4
Q

What is silting?

A

Collection of fine particles in critical areas

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5
Q

What are the 5 major sources of system contaminates?

A

Contamination built in at the point of manufacture

Hydraulic fluid contamination

Environmental contamination

System wear contamination

Contamination introduced during the servicing process

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6
Q

Dirt particles are measured in what?

A

Microns - 0.001mm

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7
Q

What is absolute filter fineness?

A

Indicates the largest particle able to pass through the filter

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8
Q

What is nominal filter fineness?

A

Particles of nominal pore size are stopped passing through several times, a percentage of particles

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9
Q

What type of application uses grade 1-5

A

Aeronautics

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10
Q

What type of application uses grade 25-40?

A

Low pressure systems

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11
Q

What are the 2 types of filter designs?

A

Surface filter

Deep bed filters

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12
Q

What is surface filter?

A

Thin layer of woven fabric e.g metal gauze. Disposable and suitable for flushing and commissioning a system

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13
Q

What is deep bed filter?

A

Compressed, multi fabric fibres which have a much higher dirt retention capacity across the same filter area

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14
Q

What is bypass filtration?

A

Only part of the delivery is filtered

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15
Q

What is main flow filtration?

A

Suction, pressure and return lines are filtered

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16
Q

What is the disadvantages of by pass filter?

A

Low dirt filtering capacity

Only part of the delivery is filtered

17
Q

What is the advantages of main flow filtration?

A

Protects pump and prevents cavitation

18
Q

Where is the pressure line filter located and what are the advantages and disadvantages?

A

After the pump

Protects valves sensitive to dirt

Only protects valves sensitive to dirt and expensive

19
Q

Where is the suction line and what are the disadvantages and advantages?

A

Before the pump

Protects pump

Can starve pump if becomes blocked

20
Q

Where is the return line located and what are the disadvantages and advantages?

A

On the return line

Cleans fluid returning to the tank

Contamination can only be removed after passing through components

Hydraulics (14 decks)

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