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...my Stuff > Propulsion/ Aux Turbines & Reduction Gears/ Propellers > Flashcards

Propulsion/ Aux Turbines & Reduction Gears/ Propellers Flashcards

1
Q

what type of turbine blading is used for installation in circumferential groves?

A

tee-rot blading

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2
Q

outside dovetail type turbine is used with what type of entry?

A

circumferential entry

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3
Q

how is axial-entry type turbine blading secured to the rotor wheel (disk)?

A

by a platform interlock, pin or key

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4
Q

end play cold thrust bearing clearance is defined as?

A

the distance the thrust collar can be moved between the forward and aft thrust bearing faces without applying appreciable load to either face

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5
Q

typical end play with the engine cold is?

A

.008 - .014 inch

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6
Q

the term total float clearance refers to what?

A

the axial clearance taken with the thrust bearing shoes removed

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7
Q

when taking bearing depth micrometer readings, bridge gage readings and the taking of leads the lube oil system should be secured when?

A

24 hours prior to taking the readings

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8
Q

what material are oil deflectors manufactured from?

A

aluminum or bronze

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9
Q

what NSTM covers general information on SSTG turbines?

A

NSTM 231

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10
Q

what two types of impulse turbines used exclusively for auxiliary use?

A

curtis-rateau or straight rateau

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11
Q

the lube oil cooler should be bypassed on an operating auxiliary turbine until the discharge oil temperature reads what?

A

100 degrees F

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12
Q

if a metal edge filter is installed in the oil line on an auxiliary turbine, the filter handle shall be turned how many ties per watch?

A

at least once per watch

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13
Q

when starting SSTG’s what is the minimum allowable lube oil temperature?

A

60 degrees F

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14
Q

after starting an SSTG, at what vacuum is the generator brought up to speed?

A

15 inches

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15
Q

what is the major difference critical RPMs on an SSTG compared to a auxiliary turbine?

A

critical SSTG RPMs are achieved at 20-25 percent below normal operating speed, auxiliary turbine critical RPM’s is achieved above normal operating pressure

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16
Q

temporary distortion of the SSTG rotor after the numerous start/stop episodes is known what?

A

a bowed motor

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17
Q

what must the lube oil temperature be on a SSTG prior to bringing it up to operating speed?

A

100 degrees F

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18
Q

SSTG gland sealing steam pressure has a range of what?

A

1/2 - 2 psi

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19
Q

speed limiting governors installed on auxiliary turbines are deigned to limit maximum speed to what percentage of designed speed?

A

110 percent

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20
Q

on an SSTG turbine, what action must be taken if clearance between the nozzle diaphragm and the adjacent row of blades is outside the limits prescribed by the manufacturer?

A

adjusts the position of the rotor by changing the filler piece in the thrust bearing

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21
Q

SSTGs are fitted with what type of governor?

A

constant speed

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22
Q

on an SSTG, what protects the turbine casing from excessive pressure?

A

back pressure trip

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23
Q

what is installed on non condensing turbines to protect the turbine casing from excessive pressure?

A

combination exhaust relieve valves

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24
Q

the combination exhaust relief valve is set to lift at what range?

A

2 - 3 psi above exhaust line pressure

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25
Q

what is installed upstream in the steam line of the governor to protect an SSTG turbine from debris?

A

steam strainer

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26
Q

who is the approving authority for turbine casing and rotor weld repairs

A

NAVSEA

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27
Q

how is a damaged auxiliary turbine blade removed when it is not feasible or the situation does not permit reblading?

A

the damaged blade and the blade diametrically opposite must be cut off at the junction of the vane portion and the root and the root checked for balance if practical

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28
Q

turbine failure must be reported to whom?

A

NAVSEA

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29
Q

how are failed turbine parts documented?

A

word description and photographs

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30
Q

turbine blading erosion is usually limited to what area?

A

the blade or nose tips of the last few rows of low pressure turbine

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31
Q

when steam is being admitted to the propulsion turbine the rotor should not remain idle for more than how many minutes?

A

5 minutes

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32
Q

when warning a propulsion turbine, the turbine should be rotated with steam at what interval?

A

every 2 - 3 minutes

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33
Q

what is the quickest means to determine any change in the relief position of the propulsion turbine rotor caused by bearing wear?

A

depth gauge micrometer

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34
Q

what maintains the axial position of the propulsion turbine rotor?

A

thrust bearings

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35
Q

what maintains the radial position of the propulsion turbine rotor?

A

journal bearings

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36
Q

how is the propulsion turbine bearing wear determined?

A

by measuring the outside of the diameter of the rotor journal and the inside diameter of the bearing to determine actual oil clearances. the difference between the old and the new clearance readings will be the amount of bearing wear.

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37
Q

what type of gauge is used to measure the clearance between the high pressure and low pressure turbine?

A

taper gauge

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38
Q

when replacing a propulsion turbine journal bearing, the rotor must be lifted vertically to what maximum height, in order to ease the removing of the lower half of the bearing ?

A

.005 inch

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39
Q

if damaged labyrinth packing cannot be replaced due to operation commitments, how can the packing be repaired?

A

by use of a chisel bar and. hand chisel to straighten the teeth

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40
Q

what action must be taken if you suspect internal turbine damage that warrants lifting the turbine?

A

a request to lift is made to NAVSEA

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41
Q

whenever a propulsion turbine casing joint is opened for any reason, a final contact check is required by taking red and blue check of the made up joint, what is the required contact for non pumping groove joints?

A

75 percent contact over the entire joint plus 1/2 inch minimum continuous contact and inside the bolts and across each pressure section

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42
Q

when is the work considered complete on a propulsion turbine that was opened for inspection and repair?

A

after satisfactory dock and post repair trials

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43
Q

how many types of propulsion turbines are used in the Navy?

A

five

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44
Q

on an SSTg, what is used to seal the nozzle diaphragm and the rotor to prevent steam leakage?

A

labyrinth packing

45
Q

what is the function of the staff packing on an SSTG?

A

to prevent leakage of steam from an ingress of air into the turbines

46
Q

to obtain maximum effective sealing of the labyrinth packing the rip width of packing should be maintained within what parameter?

A

.010 inch

47
Q

what NSTM contains information on the repair and care of labyrinth packing?

A

NSTM 231

48
Q

what is the most common slant that is used on turbine casing joints?

A

copalite

49
Q

what is the most common cause of turbine blade failure?

A

resonant blade vibration

50
Q

what method of measurement is used to determine radial seal wear?

A

crown thickness method

51
Q

prior to conducting thrust bearing measurements on the main engine, the turbine must be at ambient temperature with the throttles shut for what duration?

A

24 hours

52
Q

steam turbine rotos and bearings are classified as what level of repairable part?

A

depot level

53
Q

when a defective turbine part is received from the navy stock system, what report must be filed?

A

the quality deficiency report (QDR), SF 364

54
Q

what is the most commonly used propulsion turbine?

A

Type II-A (straight through unit)

55
Q

a constant security watch must be maintained when conducting turbine nozzle clearances, the watch must be who?

A

a responsible E-5 or above

56
Q

turbine lagging pads must be verified as non asbestos by using what guidance?

A

NSTM 635

57
Q

what advantage does a locked train reduction gear have over other designs?

A

has the capability of transmitting higher powers, lower sensitivity to misalignments and ease of misalignments

58
Q

main reduction gears are inspected by NAVSEA at what interval?

A

every ten years or when conditions warrant

59
Q

who is authorized to extend the ten year reduction gear inspection?

A

by TYCOM when operating conditions indicate that a longer interval between inspection is desirable

60
Q

detailed information on reduction gear security can be found in what NSTM?

A

NSTM 241

61
Q

what are two types of reduction gears used in auxiliary type ship?

A

worm and helical

62
Q

what type of reduction gear would you expect to find inane auxiliary type ship?

A

tandem articulated double reduction with one or more power inputs

63
Q

define transverse diametrical pitch of a reduction gear?

A

the ratio of the number of teeth of the number of inches of the pitch diameter

64
Q

when the ship is within 1 hour of port or anchorage and maintaining standard speed the reduction gear lube oil temperature is lowered to what?

A

10-15 degrees F or 100 degree minimum

65
Q

while import, how often must the secured reduction gear be rotated with lubrication?

A

weekly

66
Q

during the weekly lubrication of the reduction gear, the propeller shaft should be jacked how many turns?

A

one and quarter ( 1 1/4) turns

67
Q

what inspection is accomplished bi weekly on a secured reduction gears?

A

visual inspection

68
Q

inspection plates, connections, fittings or covers, which permit access to the reduction gear casing, must not be removed without whose authority?

A

engineer officer

69
Q

what NSTM has general reduction gear information?

A

NSTM 241

70
Q

reduction gears having a 125 k-factor or less must have a tooth contact of what, to be considered satisfactory?

A

80 percent

71
Q

what determines the blacklash on a pair of double helical gears?

A

longitudinal movement

72
Q

a standard SSTg reduction gear has a gear ratio of what?

A

8 to 1

73
Q

after installing new bearings on an SSTG reduction gear, what is the required gear tooth contact?

A

90 percent contact

74
Q

what is the required reduction gear tooth contact for an SSTG with helical gear?

A

80 percent of the face width

75
Q

where is the pre close out inspection of the main reduction gear logged?

A

in the engineering log

76
Q

who conducts the pre close out inspection of the main reduction gear?

A

engineer officer

77
Q

what is the requirement for the installation of locks on main reduction gear panels and plates?

A

locks are required on all apnea and plates with 1 or fewer bolts and nuts

78
Q

who performs the ten year reduction gear inspection?

A

naval shipyard or contracts shipyard

79
Q

all reduction gears are fitted with oil spray nozzles oil onto the gears, if these nozzles become clogged when corrective actions must be taken?

A

secure the gears and clean the affected oil spray nozzles. scary nozzles are required to be kept open during any gear operation

80
Q

main engine turbine bearings are measured for what at what normal interval?

A

annually

81
Q

when must a constant be re-estalished on a main engine bearing?

A

upon bearing replacement

82
Q

where are bearing measurements recorded and by whom?

A

by the work center supervisor and logged in a permanent bearing book

83
Q

define the term blacklash?

A

the amount by which the width of a tooth spaces exceed the tooth thickness of the engaging tooth at the operating pitch circle

84
Q

define the term K-factor when associated with reduction gears

A

an index that indicates the intensity of tooth from the standpoint of tooth surface durability

85
Q

what two processes are used to Harden gear elements?

A

carburizing and nitriding

86
Q

what is the most common bearing found in MRG’s?

A

sleeve type

87
Q

how is a dental type coupling lubricated?

A

by a continuous flow of oil to the coupling teeth through the adjacent bearing feed line or spray nozzle

88
Q

the electric motor driven turning gear to what on the MRG?

A

1st reduction gear

89
Q

what is used to remove airborne oil fog emanating from the MRG vent airstream before it can be discharged into the machinery space?

A

the electrostatic (vent fog) precipitator

90
Q

what is located after the air inlet within the bottom of the vent fog precipitator?

A

a flame arrestor assembly

91
Q

what is the only acceptable criteria for an operating MRG lube oil sample?

A

clear and bright

92
Q

when does torsional critical speed normally occur in an operating MRG?

A

at low speed

93
Q

after securing the MRG, the main lube oil pump is secured IAW what criteria?

A

once the lube oil temperature is within 10 degrees F of engine room ambient temrpature

94
Q

when the ship is docked and the gears are rotated by the turning gear, throttles are close and secured with chain and lock. who is responsible for the key to that lock?

A

the engineer officer

95
Q

when a dehumidifier is installed during an extended MRG lay-up, the dehumidifier must maintain what relative humidity within the MRG casing?

A

less than 35 percent relative humidity

96
Q

access covers or plates installed on MRG attached with less than 12 nuts and bolts have what percentage secured with a lockable cover?

A

25 percent

97
Q

who authorizes any dismantling or removal of any MRG casing or its access openings, piping, matched fixtures, or fittings?

A

engineer officer

98
Q

custody of keys for all security locks are the responsibility of whom?

A

OEM personnel

99
Q

at what frequency is the main shaft inflatable seal tested?

A

semi-annual or IAW PMS

100
Q

what medium is used to inflate the main shaft seal under normal conditions?

A

CO2

101
Q

what NSTM covers general information on all types of propellers?

A

NSTM 245

102
Q

the area most likely to cavitate on a propeller is?

A

the suction side of the outer radii and areas near the leading edge

103
Q

a propeller that vibrate at natural frequency is characterized by what term?

A

singing

104
Q

propellers that have been in operation for more than five years must be inspected by what technique?

A

liquid penetrant

105
Q

upon completion of a propeller visual inspection report, the report is submitted to whom?

A

type commander or ship’s CO

106
Q

what type of proper cleaning uses non siliceous material?

A

hone blasting

107
Q

who approves all procedures for repairing non bronze propellers?

A

NAVSEA

108
Q

waterborne propeller visual inspections are conducted at what frequency?

A

every six months

...my Stuff (18 decks)

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