Revsisin Cards Flashcards
What’s HPSWM mean ?
High pressure salt water main
How much bar does the HPSWS kick out to all areas and services throughout the ship ?
7 bar
What does HPSWS supply to on ship
Firefighting equipment/ pre wetting system/ edutors/ emergency cooling to gas turbines/ making of fresh water/ flushing heads
How is salt water supplied around 2 deck ?
By a ringmain
Minimum amount of pumps to be running at one time ?
1
How does each pump get rid of the debris
Strainers
How much leak off does each pump have and why ?
10% leak off
To prevent over pressurisation
When can pumps be operated from
Locally and remotely
Where’s can the firefighting equipment supplied by the HPSWM sprays be found ?
Magazines
Paint lockers
Inflam store
Funnels
What’s DC state 1
1- all pumps running
2- DC state 1 valves shut
3- HPSWM is divided into zones
What’s pre wet ?
It’s used to get rid of NBC contamination of upper decks
What’s DC state 3
1- 1 pump is running
2- other pumps on standby
3- all dc state valves are open
What temperature would white metal bearings melt at ?
115 degrees
Which machinery are cooled by the main propulsion circulation system ?
Gas turbine
Plumber block emergency cooling
Main forced lib system
Controllable pitch propellor
What machinery is cooled by the auxiliary machinery circulation system ?
Diesel generators
Air conditioning plant
Two reasons for using fresh water to directly cool machinery ?
•Some equipment may be susceptible to corrosion
•The system may be affected by salt water contamination
If the fresh water pump then the system can be x-connected to the HPSWM. Who’s permission do you need ?
The MEOS
What does MARPOL mean ?
Maritime pollution.
When is discharge of oil or oily mixtures aloud ?
• the ship is underway
• the oil in the effulent without dilution does exceed 15ppm
• the ship has in operation an oily water separating filter with a oil discharge monitoring and control system
What’s special about discharge in Antarctic area ?
Any discharge into the sea of oil or oily mixture from any ship is prohibited
Special areas defined by the international maritime organisation (IMO)
Caribbean
Celtic sea
Mediterranean Sea
Celtic sea
English channel
Irish Sea
North sea
Baltic Sea
Most common sources of oily water contamination
Bilges
Fuel systems
Oily systems
CPP systems
Point to make sure the least amount of oil enters the bilge
Keep machinery spotless
Monitor and investigate heavy uses
No surfactants to be used
Afff used only real risk situations
Eductors to be manned in operation
Maximise use of shoreside facilities
Define black water sewage
It is defined as drainage from Wcs, urinals, medical compartments and any water mixed with this waste
Black water can be discharged at certain points what are they ?
Within 4NM of the coast= sewage treatment plant has to be operation
Between 4 & 12NM of the coat = an emo approved system to disinfect
Over 12NM from the coast = no treatment
Order of Opening the valves On
A eductor ?
1- open discharge overboard
2- open motive force
3- open bilge suction
2 types of sewage treatment plant ?
Biological and collect/hold/transfer
IMS meaning
Inside machinery space
OMS
Outside machinery space
If aerobic digestion fails what is given off
Hydrogen sulphide
Where does contamination come from working with sewage
Dangerous chemicals
Raw sewage
Dangerous gases
How long can you store shit in holding tanks/ collecting tanks
Holding tanks - 12 days
Collecting tanks - 24 hours
IMO means
International maritime organisation
How much bar for 1-4 stages
1st stage= 4 bar
2nd stage= 16
3rd stage= 64
4th stage= 276
What do you need to do when working with hoses ?
-Must connect at each end
-Any hose unconnected must have safety line attached
-Screw connections must be free from oil and gases
- flexible horse must not be used for washing down
What does hspwm do ?
Supplies all areas and services on ship with 7 bar
What is LP air used for ?
-pneumatic tools
- radar wave guides
- emergency stern seal inflation
-pneumatic surveillance panels
What is supplied with hp air
•DG
•GT
•Ships siren
•BA
•Weapon systems
•Hydraulic system accumulator charging
•air driven machinery operation
•reducing valve
What is VPS
Made up of hoses manifolds and pumps
What machinery is cooled down by main propulsion circulation system
GT
Plumber block
Making forced lub oil system
CPP
