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Maintenance Procedure Flashcards

1
Q

cadmium plated fasteners are not used in systems with temperature exceeding what?

A

400 degrees F

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2
Q

what publication lists general information on threaded fasteners?

A

NSTM 075

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3
Q

male threads on threaded fasteners, when installed and tightened, shall protrude the distance of at least how many threads?

A

at least one thread length beyond the top of the nut

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4
Q

what is the maximum thread protrusion allowed after installation and tightening of threaded fasteners?

A

10 threads maximum

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5
Q

a nut designated B-16 is considered what level of threaded fastener?

A

level one

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6
Q

anaerobic compounds, when used with threaded fasteners, serve what purpose?

A

used as a thread locking compound

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7
Q

a stud or nut marked “NC” indicates what?

A

Nickel Copper (Monel) composition

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8
Q

at what boiler pressure is the sodium nitrite solution injected into the boiler, prior to placing the boiler on a dry lay-up?

A

100 psig or less

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9
Q

all bilge water contaminated with hydrazine must be disposed of in accordance with what publication?

A

NSTM 593

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10
Q

what must be done to boilers under Deaerated backfill, steam blanket, or nitrogen blanket lay ups prior to shifting to a hydrazine lay up?

A

the boiler must be dumped

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11
Q

prior to entering the boiler to perform fireside cleaning, what must be done to the steam smothering system?

A

wire and tag the valves in the closed position

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12
Q

main propulsion boilers are inspected at what periodicity

A

every 18 months

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13
Q

high pressure water-jet cleaning is used to remove what type of waterside deposits?

A

soft deposits

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14
Q

EDTA cleaning is considered what type of cleaning?

A

mechanical

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15
Q

when dumping EDTA to the bilge, what id added to the bilge water to neutralize the EDTA corrosive properties?

A

citric acid

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16
Q

how often is the power driven tube cleaner lubricated while in operation?

A

every 10 minutes

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17
Q

how often are boiler fireside cleaned?

A

every 1800 to 2000 steaming hours

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18
Q

what type of plug is normally used in plugging boiler tubes?

A

standard taper plug

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19
Q

what is the normal length of a tapered plug?

A

3 inches

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20
Q

what is the recommended taper of a standard taper plug?

A

3/4” per foot

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21
Q

what type of plug would be used to plug a drum or header tube hole after tube removal if replacement tubes are unavailable?

A

blind nipple

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22
Q

boiler full power capability will be affected if what percentage of generating tubes are plugged?

A

greater than 5 percent

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23
Q

what is the allowable percentage of economizer tubes, that can be plugged without affecting boiler full power capability?

A

20 percent

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24
Q

when measuring a handle seat with a feeler gauge what is the maximum taper allowed?

A

.008

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25
Q

when measuring a manhole seat with a feeler gauge what is the maximum taper allowed?

A

.012

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26
Q

what is the maximum shoulder clearance on a manhole plate?

A

3/32”

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27
Q

what hydrostatic test pressure requires the renewing of all boiler handhold and manhole gaskets after testing?

A

150 percent of boiler design

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28
Q

desuperheaters shall be hydrostatic tested at what pressure?

A

350 psig

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29
Q

what is the purpose of backlashing heat exchangers?

A

to remove soft fouling

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30
Q

what is used as the flushing medium for the backlashing heat exchangers?

A

firemain

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31
Q

how is hard fouling removed from heat exchangers?

A

high pressure water jet or acid cleaning

32
Q

in what publication will you find guidance on acid cleaning of heat exchangers?

A

NSTM 531

33
Q

what size fire hose is used for the backflushing procedure?

A

2 1/2 inch

34
Q

what acid cleaning method is used onboard ship for coolers?

A

sulfuric acid cleaning

35
Q

what type of plugs are used to plug blocked tubes temporarily in heat exchangers?

A

tapered phenolic plugs

36
Q

what is installed in heat exchangers to combat against galvanic corrosion?

A

zincs

37
Q

what type of fasteners must be used in salt water coolers?

A

non-ferrous

38
Q

what tool is used to split boiler tubes in preparation for removal?

A

safety ripping chisel

39
Q

a firebrick withe the following dimensions 2 1/2” x4 1/2 x 13 9/16 is often refereed to as?

A

brick and a half

40
Q

what type of brush is used to clean handhold seating surfaces?

A

cup brush

41
Q

rotary soot blowers are tested in accordance with PMS to have an operating pressure of what?

A

300 psi plus or minus 25 psi

42
Q

what is the required frequency of cleaning boiler watersides with the chelant system installed?

A

every 18 months during boiler isnpection

43
Q

what is the periodicity for testing boiler safety hand easing gear?

A

every 1800 to 2000 steaming hours

44
Q

what tool is used to resurface handhold seats?

A

handhold seat refacing tool

45
Q

the handhold refacing tool must only be used by what personnel?

A

qualified personnel

46
Q

in general, what is the allowable thrust clearance end play on an auxiliary turbine?

A

.010 to .015 inch

47
Q

air compressors are divided into what three classes?

A

low, medium and high pressure

48
Q

a medium air compressor operates between what pressure range?

A

151 psig to 1000 psig

49
Q

a high pressure air compressor operates above what pressure?

A

1000 psig

50
Q

what is the function of the check valve installed at each end of the feed line of the air compressor?

A

to keep the compressor air from forcing lube oil back to the lubrication

51
Q

what is the cooling medium used for most air compressors in the Navy?

A

seawater supplied from ship’s firemain

52
Q

how often are low pressure air compressor relief valves lifted by hand?

A

prior to first daily use

53
Q

what is the periodicity of testing air compressor relief valves that cannot be tested by hand?

A

semi-annual in accordance with PMS

54
Q

in what publication can you find general information on compressed air systems?

A

NSTM 551

55
Q

what device is installed to stop the high pressure air compressor automatically when the cooling water rises above a safe limit?

A

automatic temperature shut down device

56
Q

control or regulating systems for naval air compressors are mainly what type?

A

start-stop type

57
Q

what function does the air compressor unloading system serve?

A

to remove all but the friction load on the air compressor

58
Q

wire twister pliers are designed to reduce the time used to install what type of wiring

A

safety wiring

59
Q

what is used to cut threads in metal, plastics and rubber?

A

tap and dies

60
Q

taps are used to cut what type of threads?

A

internal threads

61
Q

dies are used to cut what type of threads?

A

external threads

62
Q

what tool is used to dress bruised or rusted threads?

A

dies

63
Q

what tool is used to remove broken screws without damaging the surrounding material or the threaded hole?

A

screw extractor

64
Q

how can you retrieve small articles that have fallen into places where you cannot reach them by hand?

A

mechanical fingers

65
Q

what tool is used to tighten nuts, bolts and fasteners to a specific tolerance?

A

torque wrench

66
Q

before using a torque wrench you must ensure that the wrench has been what?

A

calibrated and label affixed

67
Q

what type of caliper has the ability o provide accurate measurements over a large range?

A

vernier caliper

68
Q

what type of micrometer would be used to measure a piece of round stock?

A

outside micrometer

69
Q

what type pf micrometer would meaner holes or recesses?

A

depth micrometer

70
Q

the types of micrometers commonly used are made so that the longest movement possible between the spindle and the anvil is one inch. what is this movement called?

A

the range

71
Q

what two parts of an outside micrometer do you take the reading from?

A

sleeve and thimble

72
Q

when the outside the outside micrometer spindle is rotated one revolution, the spindle advances or recess what distance?

A

.025 inch

73
Q

what parts of an outside micrometer are adjusted to torch the piece being measured?

A

anvil and spindle

74
Q

the thimble an outside micrometer is divided into what increments?

A

increments of 5 (0,5,10)

75
Q

the racket stop on an outside micrometer serves what purpose?

A

to look the micrometer reading in place, preventing dippage

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