sm deisels Flashcards
what is the role of diesel engines on a submarine?
as emergency generators(
cold moves
reactor start up
batter charging
smoke clearance
what engine is on T class boats and what does it produce ?
2x 12 cylinder Paxman Venturas
produce 450kw dc
what engine is on V class boats and what does it produce ?
2 x 12 cylinder Paxman Valenta
produces 750 Kw DC 850 Kw AC
what engine is on A class boats and what does it produce ?
2 x 8 cylinder MTU 396’s
produce 500 Kw AC and DC
what is the bore and stroke length of the Paxman venturas
bore 197mm
stroke length 216mm
what is a explosion cock?
used to remove water from the cylinder on start up
what is the job of the governor?
to control the speed of the engine by controlling the fuel volume
what is the job of the bell housing?
to cover the flywheel
what fluids does a engine need?
water
lub oil
fuel
HP air
combustion air
get rid of
exhaust gases
what is the system code for bulk fuel storage?
OFS (oil fuel storage)
what is the 3 roles of the bulk fuel storage?
to provide storage of fuel
secondary shielding from reactor
stability using displaced tanks
how do you tell the level of the fuel tanks?
open the pet cocks to check for fuel
how is the engine fuelled and what is the comp water pressure?
compensating water enters the displacements tanks
pressurises the fuel in No 2 tanks
exerts pressure on N01 tank through the syphon tank
forcing it into the engine
comp water pressure = 1 bar
what is the role of the first filling connection?
to allow the tank to be filled with SW then backfilled with Diesel
what are the precautions for fuelling?
1.establish communications between all stations
2.ensure sullage barge is available for the discharge
3.watertight integrity is checked
4.enviromental precautions in place
5.no naked flames or lights
what is the procedure for first filling?
- water hose rigged from jetty to 1st filling connection and subsequent valves to barge
2.bulk storage tanks fill with water discharge at barge shows tanks full of water
3.hoses are rerun from fuel supply to subsequent valves first filling point connected to barge
4 start filling once discharge of fuel at barge tanks are full
5.disconnect hoses (avoid spillage) and tow barge away
how do we stop fuel spillage in the event of a burst pipe?
by using sheathed fuel pipes.
what are the contamination found in oil
fuel - low viscosity
oxidation - high viscosity
water - water content
sulphur - total base number
carbon - insoluble
how do you take a oil sample
- wear PPE
2.draw a sample from main oil rail
3.always sample from the same point
4.draw a sample when at working temp
5.purge sample line
6.draw a sample into a clean plastic container
7.dont sample at low flow zones or when shut down
what pressure will the lube oil alarm sound at?
2.07 bar
what lube oil pressure with the engine trip at?
1.75 bar
what is the normal oil temp?
77-93 degrees c
what temp will the lube oil alarm at?
96 degrees c
what temp will the lube oil cause a trip?
99 degrees c
what temp will the coolant alarm at?
85 degrees c
what temp will the coolant cause a trip at?
88 degrees c
what are hull and back up valves tested to?
deep diving system test pressure
what pressure is system pressure measured to?
10 bar
label the parts of the engine.
label the parts of the engine.
label the parts of the bulk Oil fuel Stowage
label the parts of the wet oil sump system.
label the lube oil parts on the drive end.
label the lube oil parts from the free end.
label the coolant parts from the free end.
label the parts of the salt water system onboard.
name this part.
label the parts of the air start system.
name this part
label the snort mast parts.
name the air start parts.
label the parts of the exhaust system.
label the masts.
what are the hazards of watchkeeping a diesel engines?
rotating machinery
electric shock
HP air
High Pressure fluids
heavy weight hazards
chemicals dangers (lube oil, fuel and coolant)
fire hazards
slips trips and falls
noise
pipe burst (coolant and fuel)
why are man below tallies important?
man below tallies tell you how many people are in the compartment and if it is safe to use Fire protection systems or flood a compartment
what are the four things that will trip the engine?
engine overspeed
coolant temp
lub oil temp
lub oil pressure
what five things need to monitored on a engine?
engine speed
coolant temp
lub oil temp
lub oil pressure
exhaust gases temp
how is air drawn into the submarine?
by the snort induction mast.
how is the backup valve opened?
automatically with revs of the engine
why do we need a external cooling tanks?
to cool the exhaust valves when running on the surface
why are flap valves important on the exhaust systems?
flap valves prevent exhausts going back into the engines.
how is the main exhaust valve controlled?
manual / remote 2 position valve
what are the prestart checks
check fire-fighting equiment
check electrical supplies are on
check auto watch-keeping panel is switched on
check remote control of governor
check overspeed and governor trips
check air bottle pressure
open up air start system
check air start reducing pressure
check firesafe valve
open fuel system
how do you shut down a engine
start lub oil priming pump
press red stop button
check backup valves are shut
shut fuel off
shut air off
stop lub oil priming pump
