Module 7 Flashcards
How are High pressure salt water pumps driven
Electrically
How do you stop over pressurisation
Pressure relief valve
10% leak off
Where would fixed sprayes be used in areas of high risk
Magazines
Paint lockers
Inflame stores
Funnel
HPSW System uses
Firefighting Pre wetting system Fitting bigle and salvage eductors Emergency cooling to main propulsion gas turbines/ diesel generators Auxiliary machinery cooling water system Flushing heads
Where are ringmans fitted
With the isolation valves
How can the construction of a ringman be described
A ring of pipework running around 2 deck that can be sub-devided by the use of isolation valves
What is pre wetting used for
Used in a nuclear biological and chemical environment to reduce contamination levels
What are the damage control states
DC state 1
DC state 3
Whats DC state 1
Valves are shut
All pumpe are running
Used is under threat or attack
DC state 3
All valves are open and only one pump is supplying the whole system
Normal everyday use
Whats the purpose of the crosscontection valves
If one strainer us blocked
What temp does white metal melt at
115 degrees C
Reasons for fresh water circulation system
Machinary is susceptible to salt water
Other equipment can be affected by salt water contamination
What happens is machinary is jot cooled correctly
More likely to cause fires, equipment failure, bearings wipe or equipment sizing
Main propulstion of cooling system
Lube oil hest exchange
Gas turbine head exchanger
CPP unitl heat exchanger
Plumber block heat exchanger
Is lubrication/ AI39 system an ooen or closed loop system
Closed loop
Is cooling circulation system an open or closed loop system
Open loop
MARPOL??
Maritime pollution regulations
IMO??
International maritime organisation
Any discharge of oil or oil mixtures is prohibited except when…
The ship is underway
The oil content is the effluent, does not exceed 15pp
The ship has in operation and oil water separating filter with an oil discharge monitoring and control system
Most commo sources of oily water contaminators
Bilges
Fuel system
Oil system
CPP system
How do you minimise the risk of oil entering the bilge
Keep machinery clean
make sure its not leaking
no surfactants
AFFF in real fire risk situations
Educators to be manned when in operation
Black water can be defined as the drainage waste from
WC’s
Urinals
WC scuppers
Medical compartments
Any water mixed with this waste
Where can grey water be found
Bathrooms
Galleys
Dishwasher
Laundries
Sinks
What is the correct way to operate and educator is to
open discharge over board
Open the motive water supplies from the HPSWM
Open the bilge suction valves
How far are you allowed to discharge sewage if it has been through sewage treatment plant
4NM
What’re the health hazards for raw sewage being close to shore
Typhoid
Hepatitis
Gastro
Some advantages of using the sewage plant
Reduce the number of ship side openings
Simplify pipe runs
Heads and bathrooms can be lower in the ship
Heads and bathrooms can be used to dry dock
The ship can operate in anti pollution areas
It is easier to close down CBRN conditions
Hazards associated with CHT
Dangerous chemical
Raw Sewage
Dangerous gases
What is the effect of hydrogen sulphide on the human body
can very quickly anaesthetise nasal passages and therefore the sense of smell is lost
0.03ppm is detected by odour
70-150ppm kills smell
700-1000ppm threat to life
High pressure compressed air advantages
The air can be easily distributed throughout the ship
The air can be easily stored
Flexibility and reliability of use
Low risk of fire
High pressure air can be divided into two categories
Hight Pressure air operating at 276 bar
Reduced HP air operating blow 276 bar as required by specific equipment’s
High pressure air can be in two different areas
Inside machinery space
Outside machinery space
Max pressure of the high pressured air
276 bar
High pressure air system components
Ring man Isolating valve storage bottles relief valves reducing stations pressure gauges HP to LP cross - connection
what does the water jacket protect
fw cooling system and sw main from over pressurisation
3.5 Bar
what do you have alarms and warnings in place for
High temp water
Low oil pressure
4 stage pressures
Stage 1 = 4 bar 2= 17.5 bar 3=68 bar 4=276 bar
LP air is used for :
Pneumatic tools
Radar waveguides
Emergency Stern Seal Inflation
Pneumatic surveillance panels
What pressure air is produced in low pressured air
8 bar
what PPE must you wear when working with HP and LP Air
Goggles
Ear defenders
