Maintenance Procedure Flashcards
cadmium plated fasteners are not used in systems with temperature exceeding what?
400 degrees F
what publication lists general information on threaded fasteners?
NSTM 075
male threads on threaded fasteners, when installed and tightened, shall protrude the distance of at least how many threads?
at least one thread length beyond the top of the nut
what is the maximum thread protrusion allowed after installation and tightening of threaded fasteners?
10 threads maximum
a nut designated B-16 is considered what level of threaded fastener?
level one
anaerobic compounds, when used with threaded fasteners, serve what purpose?
used as a thread locking compound
a stud or nut marked “NC” indicates what?
Nickel Copper (Monel) composition
at what boiler pressure is the sodium nitrite solution injected into the boiler, prior to placing the boiler on a dry lay-up?
100 psig or less
all bilge water contaminated with hydrazine must be disposed of in accordance with what publication?
NSTM 593
what must be done to boilers under Deaerated backfill, steam blanket, or nitrogen blanket lay ups prior to shifting to a hydrazine lay up?
the boiler must be dumped
prior to entering the boiler to perform fireside cleaning, what must be done to the steam smothering system?
wire and tag the valves in the closed position
main propulsion boilers are inspected at what periodicity
every 18 months
high pressure water-jet cleaning is used to remove what type of waterside deposits?
soft deposits
EDTA cleaning is considered what type of cleaning?
mechanical
when dumping EDTA to the bilge, what id added to the bilge water to neutralize the EDTA corrosive properties?
citric acid
how often is the power driven tube cleaner lubricated while in operation?
every 10 minutes
how often are boiler fireside cleaned?
every 1800 to 2000 steaming hours
what type of plug is normally used in plugging boiler tubes?
standard taper plug
what is the normal length of a tapered plug?
3 inches
what is the recommended taper of a standard taper plug?
3/4” per foot
what type of plug would be used to plug a drum or header tube hole after tube removal if replacement tubes are unavailable?
blind nipple
boiler full power capability will be affected if what percentage of generating tubes are plugged?
greater than 5 percent
what is the allowable percentage of economizer tubes, that can be plugged without affecting boiler full power capability?
20 percent
when measuring a handle seat with a feeler gauge what is the maximum taper allowed?
.008
when measuring a manhole seat with a feeler gauge what is the maximum taper allowed?
.012
what is the maximum shoulder clearance on a manhole plate?
3/32”
what hydrostatic test pressure requires the renewing of all boiler handhold and manhole gaskets after testing?
150 percent of boiler design
desuperheaters shall be hydrostatic tested at what pressure?
350 psig
what is the purpose of backlashing heat exchangers?
to remove soft fouling
what is used as the flushing medium for the backlashing heat exchangers?
firemain
how is hard fouling removed from heat exchangers?
high pressure water jet or acid cleaning
in what publication will you find guidance on acid cleaning of heat exchangers?
NSTM 531
what size fire hose is used for the backflushing procedure?
2 1/2 inch
what acid cleaning method is used onboard ship for coolers?
sulfuric acid cleaning
what type of plugs are used to plug blocked tubes temporarily in heat exchangers?
tapered phenolic plugs
what is installed in heat exchangers to combat against galvanic corrosion?
zincs
what type of fasteners must be used in salt water coolers?
non-ferrous
what tool is used to split boiler tubes in preparation for removal?
safety ripping chisel
a firebrick withe the following dimensions 2 1/2” x4 1/2 x 13 9/16 is often refereed to as?
brick and a half
what type of brush is used to clean handhold seating surfaces?
cup brush
rotary soot blowers are tested in accordance with PMS to have an operating pressure of what?
300 psi plus or minus 25 psi
what is the required frequency of cleaning boiler watersides with the chelant system installed?
every 18 months during boiler isnpection
what is the periodicity for testing boiler safety hand easing gear?
every 1800 to 2000 steaming hours
what tool is used to resurface handhold seats?
handhold seat refacing tool
the handhold refacing tool must only be used by what personnel?
qualified personnel
in general, what is the allowable thrust clearance end play on an auxiliary turbine?
.010 to .015 inch
air compressors are divided into what three classes?
low, medium and high pressure
a medium air compressor operates between what pressure range?
151 psig to 1000 psig
a high pressure air compressor operates above what pressure?
1000 psig
what is the function of the check valve installed at each end of the feed line of the air compressor?
to keep the compressor air from forcing lube oil back to the lubrication
what is the cooling medium used for most air compressors in the Navy?
seawater supplied from ship’s firemain
how often are low pressure air compressor relief valves lifted by hand?
prior to first daily use
what is the periodicity of testing air compressor relief valves that cannot be tested by hand?
semi-annual in accordance with PMS
in what publication can you find general information on compressed air systems?
NSTM 551
what device is installed to stop the high pressure air compressor automatically when the cooling water rises above a safe limit?
automatic temperature shut down device
control or regulating systems for naval air compressors are mainly what type?
start-stop type
what function does the air compressor unloading system serve?
to remove all but the friction load on the air compressor
wire twister pliers are designed to reduce the time used to install what type of wiring
safety wiring
what is used to cut threads in metal, plastics and rubber?
tap and dies
taps are used to cut what type of threads?
internal threads
dies are used to cut what type of threads?
external threads
what tool is used to dress bruised or rusted threads?
dies
what tool is used to remove broken screws without damaging the surrounding material or the threaded hole?
screw extractor
how can you retrieve small articles that have fallen into places where you cannot reach them by hand?
mechanical fingers
what tool is used to tighten nuts, bolts and fasteners to a specific tolerance?
torque wrench
before using a torque wrench you must ensure that the wrench has been what?
calibrated and label affixed
what type of caliper has the ability o provide accurate measurements over a large range?
vernier caliper
what type of micrometer would be used to measure a piece of round stock?
outside micrometer
what type pf micrometer would meaner holes or recesses?
depth micrometer
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?
the range
what two parts of an outside micrometer do you take the reading from?
sleeve and thimble
when the outside the outside micrometer spindle is rotated one revolution, the spindle advances or recess what distance?
.025 inch
what parts of an outside micrometer are adjusted to torch the piece being measured?
anvil and spindle
the thimble an outside micrometer is divided into what increments?
increments of 5 (0,5,10)
the racket stop on an outside micrometer serves what purpose?
to look the micrometer reading in place, preventing dippage
