Mechanical Theory 3 Flashcards
what pressure does HPSW system run at
7 bar
what is the HPSW system used for
- firefighting hydrants/sprays/centre feed hose reel
- pre-wetting system
- fitted bilge and salvage eductors
- emergancy cooling to main propulsion gas turbines / diesel generators
- auxiliary machinery cooling water system
- making of fresh water
- flushing heads
What is a salt ring-main
A ring of pipe work, running around 2 deck, that can be sun-divided by the use of isolation
Where can a salt water pump be operated from
Local - position is close to the pump
Remote - position allows for pump to be controlled from the scc
What does the salt water pump do
Takes suction from the sea, through strainers and discharges it into the ring main via a riser
What is a riser
A vertical pipe that rises salt water from machinery space level up 2/5
what happens if machinery is not cooled correctly
temperature will continue to rise until a point where machinery fails,
either seizing, wiping its bearings or catching fire.
what is the melting point of white metal
115’c
what machinery is cooled by the main cooling system
- Gas Turbine Cooling
- Plummer block emergency cooling
- Main Forced Lub system cooling
- Controllable Pitch Propeller (CPP) cooling – if fitted
what is the machinery cooled by the Auxiliary circ system
- diesel generators
- ACP -air conditioning plant
when is oil or oily mixtures allowed to be discharged
- The ship is underway.
- The oil content (without dilution) does not exceed 15ppm.
- The oily mixture is processed through approved oil filtering equipment.
what are the common sources of oily water contamination
- bilges
- fuel systems
- oil systems
- CPP (controlable pitch propeller)
give examples of specialist areas that are protected
- Baltic Sea
- North West European waters (this includes: North Sea, Irish Sea, Celtic Sea, English Channel, part of North East Atlantic)
- Mediterranean Sea
- Black Sea
- Gulf
- Gulf of Aden
- Caribbean
- Oman area of the Arabian Sea
- Southern African waters
how do you ensure the least amount of oil enters the bilge
- Keep machinery spotless, it is easier to spot leaks
- Monitor Lub Oil ready use tanks and investigate any losses
- No surfactants to be used
- AFFF only to be used in real fire risk situations (not drills)
- Eductors to be manned when in operation
- Maximise the use of shoreside facilities when alongside
what is MARPOL
Maritime Pollution
who is to be inform of a marpol incident
- Officer of the day
- officer of the watch
what is black water
- drainage and waste from WC’s
- urinals
- WC scuppers, medical compartments
- any water mixed with this waste.
what is grey water
- sewage from
- bathrooms
- galleys
- dishwashers
- laundries
- sinks
what are the regulations on sewage discharge
- Within 4 nautical miles of the coast if an IMO approved sewage treatment plant (STP) is in operation
- 4 - 12 nautical miles – treated & disinfected by a IMO approved system
- Over 12 nautical miles - no treatment
what is does VPS stand for and what is it
vacuum pumping system
* used to collect/pump black and grey water to shore facility
what is the salvage eductors
- Used to remove quantities of fluid, generally oil/ fuel/ water from bilges very quickly
what is the bilge system
- Removes excess fluid from machine spaces,
- Separates water/oil
- Discharges oil to sullage tanks
what is the sullage system
Retains dirty fluid waste until it can properly be discharged ashore
what are eductors used for
- used to suck water out of the bildge
- uses bernoulli’s theory
- HPSW Provides the motive force for an eductor.
- requires permission from MEO
