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Hydraulics- Pumps- Hoses Flashcards

1
Q

Rotary pumps are what type of displacement?

A

positive displacement

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2
Q

What is the most common type of rotary pump?

A

the gear type pump

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3
Q

What are the 5 types of rotary pumps?

A

Gear, vane, screw, sliding shoe, multiple piston

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4
Q

What may result from improper design, excessive suction lift, improper piping

A

cavitation

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5
Q

What are the disadvantages of a centrifugal pump?

A

suction lift and sensitivity to head and speed

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6
Q

What is the best and most modern way to align pumps?

A

laser optical

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7
Q

Shelf life of hoses

A

10 years

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8
Q

Flexible hoses must not be twisted during installation because

A

The service life of the hose would be reduced and fitting may become loose

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9
Q

What happens to flexible hose under pressure?

A

length contracts and diameter expands

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10
Q

Beta 5 = _____ the removal of what %?

A

Beta 5=10 removes 90%

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11
Q

Beta 10 = ___ removes what %?

A

beta 10 = 50 removes 98%

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12
Q

What are the 4 basic types of hydraulic pumps

A

Vane, piston ,gear, screw

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13
Q

What is the most common liquid contamination of hydraulic fluid?

A

Water

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14
Q

What are the five flow control valves?

A

Stop, globe, needle, Gate, plug cocks

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15
Q

at what contamination level will water show cloudiness in hydraulic fluid?

A

Cloudiness at .03%

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16
Q

What is the max allowable water content in hydraulic oil?

A

500ppm

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17
Q

What pump is seldom used, simplest of pumps, 600 psi or less?

A

Gear pump

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18
Q

What pump is rugged and highly efficient, range of 6,000 PSI or more?

A

Piston

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19
Q

What PUMP IS EFFICIENT AND Small 2,000 psi?

A

Vane

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20
Q

What pump is used for power transmission in sub 3,00 psi?

A

Screw

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21
Q

Hydraulic motors are commonly used with what type pumps?

A

Vane and piston

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22
Q

What is pressure?

A

The direct result of resistance of fluid flow

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23
Q

What chapter of the M9000 is the flex hose program?

A

505 flex hose program

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24
Q

Hose slack in a hydraulic hose should be between?

A

5-8%

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25
Q

When making a hose tag what should be on the tag?

A

Replacement date

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26
Q

What is cavitation?

A

When absolute static pressure drops below the liquid’s vapor pressure

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27
Q

What is done for BECCE’s to prevent damage from a too realistic scenario?

A

Dry run

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28
Q

What percentage of working pressure do you test a temporary hose to?

A

200%

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29
Q

Which hose is not part of a hose log?

A

Outboard hoses

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30
Q

When do you change hydraulic oil?

A

every 500 hours of operation

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31
Q

What position do vanes get stuck in?

A

Retracted position

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32
Q

What are the 4 positions of a DCV?

A

Open, Closed, Floating, tandem

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33
Q

When grit or debris is caught in a vane pump what happens?

A

Vane is stuck in retracted position

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34
Q

The difference between inlet and outlet pressure at full flow (rated capacity)?

A

Full flow differential pressure(set pressure)

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35
Q

Cavitation in piston pump on initial startup?

A

Restricted inlet to the pump

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36
Q

Hydraulic strainers are located where?

A

Before pumps or at the reservoir fills

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37
Q

Hydraulic filters are located where?

A

after the pump, return line, before entering the reservoir, and bypass loop

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38
Q

What is the most desirable flow in a hydraulic system?

A

Laminar flow

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39
Q

What is the least desirable flow in a hydraulic system?

A

Turbulent flow

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40
Q

How often do you check viscosity in hydraulic oil?

A

Systems used daily-check semi annually or

any less check annually

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41
Q

What is the greatest effect on viscosity in hydraulic oil?

A

Heat

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42
Q

Selecting the correct hydraulic connector or fitting depends on what?

A

Fluid mediation

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43
Q

A fitting in a hydraulic hose can be connected in which ways?

A

Crimped or swaged

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44
Q

What is the preferred viscosity index for most hydraulic systems?

A

90 above

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45
Q

Viscosity is measured how?

A

Saybolts universal or saybolt universal seconds

46
Q

In the CG what is the most commonly used Hydraulic fluid

A

Navy Standard hydraulic oil

47
Q

What are the 4 main requirements of fluids in hydraulic systems?

A

Transmit power, cool , seal, and Lubricate

48
Q

Hydraulic oil shall be sampled at least

A

monthly or Semi annually

49
Q

Hydraulic oil shall be exercised at least ?

A

15 min Quarterly

50
Q

What classification letter does ships hydraulic tanks have?

51
Q

In hydraulic oil testing and analysis what is an ISO cleanliness code?

A

3 digit code that indicates the amount of micron particle size

52
Q

Two types of lubricating films that exist within a hydraulic system?

A

full film and boundary lubrication

53
Q

What is it called when metal components are completely separated by a lubricating film?

54
Q

When some metal is metal to metal contact due to tolerances its called

A

Boundary lubrication

55
Q

What IS THE MOST COMMON HYDRAULIC ACCUMULATORS IN THE CG

A

Gas charged with nitrogen

56
Q

What component absorbs hydraulic shock and stores fluid under pressure as an auxiliary energy source

A

an accumulator

57
Q

After a hydraulic oil change how many hours do you have to wait to sample the system?

58
Q

What are the 2 types of hydraulic filters?

A

Surface or depth

59
Q

This component diverts fluid to a second actuator or motor to do work in another part of the system

A

Sequence valve

60
Q

How long do you test a hydraulic hose for

A

5 min a twice the operating pressure

61
Q

What is a common problem with piston type hydraulic actuators

A

external leakage

62
Q

How does hydraulic fluid get cooler

A

the reservoir

63
Q

What is the most common cause of hydraulic system failures?

A

Contamination

64
Q

What happens to a hose under psi?

A

Contracts in length, expands in width

65
Q

If a pump creates flow what creates resistance?

66
Q

What affects hydraulic oil sealing ability?

67
Q

most common type of hydraulic fluid

A

petroleum based

68
Q

If you have a bearing failure on a centrifugal pump with excessive vibration what is the likely cause?

A

Misalignment

69
Q

What are the disadvantages of the centrifugal pump?

A

cannot self prime, poor suction lift

70
Q

What are the two classifications of centrifugal pumps?

A

Single stage and multistage

71
Q

What chapter is compressed air in the NSTM

A

NSTM chapter 551

72
Q

The three classifications of impellers are

A

open, closed, and semi closed

73
Q

A measurement exceeding ___ inches would indicate excessive runout

74
Q

If you have no display on your RCS what should you check?

75
Q

what do vacuum gauges read in

76
Q

Hydraulic systems sense a certain pressure and directs the flow back in the?

A

unloader valve

77
Q

what is the most commonly used hydraulic motor

A

fixed displacement piston type

78
Q

hydraulic shock can be reduced by using what component in the line upstream by using a

A

pressure snubber

79
Q

What percentage of hydraulic failures are due to contamination?

80
Q

How long do you test a hydraulic hose?

81
Q

What pressure do you test a hydraulic hose at?

A

twice the rated pressure

82
Q

What is the diameter of the -10 hydraulic hose?

83
Q

What is the inside diameter of a -12 hydraulic hose?

84
Q

what IS THE DIAMETER OF A -16 hydraulic hose

85
Q

What are the two types of hydraulic reservoirs?

A

vented/pressurized

86
Q

the most common type of media for coarse filtration is

A

surface media

87
Q

what is the acceptable leakage rate for screw type hydraulic pump shaft seal?

88
Q

what is the max water in hydraulic fluid

89
Q

how much water PPM is acceptable in petroleum based hydraulic oil

A

130-250 ppm

90
Q

According to NSTM 556 a desirable level of water is ?

A

100 ppm or .01

91
Q

what is the most common type of reservoir

92
Q

tested PH levels in a hydraulic fluid should be

93
Q

thief samples should only be taken if the system ?

A

cannot be operated

94
Q

EPA generator training how often

95
Q

If a pressure gauge reads 0, what is the normal reading of the gauge?

96
Q

what is atmospheric pressure at sea level

97
Q

One bar is equal to

98
Q

How much does one inch squared column of air weigh if it reached as high as the atmosphere?

99
Q

Temperatures in a hydraulic reservoir shall be maintained over what temp?

100
Q

The contractor must present the CG with a Weight handling certificate?

A

Presented to KO at the arrival conference

101
Q

Lifting equipment shall be tested to ?

A

125% of the weight of the vessel to be dry docked

102
Q

When testing a crane the test should not create more than a?

A

15% list or the immersion of the deck edge the load shall be reduced accordingly

103
Q

overhauls of critical equipment components should not generally be required more than every?

A

4 or 5 years

104
Q

Complete overhauls should not be more than

105
Q

Graphic safe plates shall be provided and displayed at the cranes operator station as described?

A
  1. stability, sea state limitations, graphically show safe work zones and working load limits while operating
106
Q

How often is hydraulic fluid sampling completed?

Semi annual

A

Semi annual

107
Q

If a crane is used daily or 120 times per quarter the hydraulic oil shall be tested?

A

Quarterly and water shall not exceed .05%

108
Q

What is a dynamic load test of a crane?

A

125% for 10 min

109
Q

What is a static load test

A

150% of working load for 10 min

110
Q

Wire rope shall be tested to ?

A

200% of working load limit (WLL) with certification tag attached to fitting

111
Q

All units with cranes shall maintain _______ log

112
Q

Forklifts must be weight tested every ____ years

Auxillary Equipment (7 decks)

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