Auxiliary systems 3 Flashcards
what does HPSW stand for?
High Pressure Salt Water
what is the pressure of the HPSW main ?
7 bar or 100-120 PSI
what is the 7 uses of HPSW?
firefighting
prewetting system
bilge and salvage Eductors
emergency cooling
auxiliary machine cooling
making fresh water
flushing heads (only some ships)
describe the HPSW system.
A ring of pipework running around 2 deck that can be sub divided using isolation valves.
why do we need HPSW pumps?
to supply the ring main with high pressure salt water
special operations may need multiple pumps running but normally is only one.
what are the two setting on a pump starter?
local : controlled close to the pump
remote : trigger in SCC
describe how a HPSW pump works and prevents over pressure
takes its suction from the sea through a strainer discharging to the riser which then goes to the ring main
also has a 10% leak off to prevent over pressure
what compartments are sprays used in?
magazines
paint lockers
Inflam store
funnels
what is prewet?
spraying HPSW on the upper deck to wash chemical and contaminates of in a CBRN environment.
what is the HPSW configuration for Damage control state one?
action stations
all HPSW pumps running
DC state 1 valves are shut
HPSW is divided into zones
what is the HPSW configuration for Damage control state three?
one pump running others in standby
all DC state valves are open.
what temp do white metal bearings melt at?
115degrees c
what happens to machinery that is not cooled? (4)
temp will rise until it
fails
seizes
destroys bearings
catch fire
what does the main circulation system cool? (4)
gas turbines
emergency Plummer block cooling
main Forced Lube system
Controllable pitch propeller
why is the cross connection important in the main circulation system?
it allows for the port or starboard cooling system to share HPSW if one of the strainers is blocked
needs MEO’s permission
same with emergency cooling
what does the auxiliary cooling circulation system cool?
Air Conditioning Plant (ACP)
Diesel generator(DG)
What is the main circulation cooling system?
The main cooling system for the boat.
what type of system is the freshwater / salt water cooling circulation system.
closed loop.
why do we use fresh water rather then salt water for cooling?
as fresh water is less contaminated the SW so there is less corrosion in machinery which could damage it .
what is the regulation we comply with to do with the enviroment?
maritime pollution regulation 1973/78
when can you discharge oil or oily mixtures?
when ship is underway
if the oil content is under 15ppm without dilution
ship must be fitted with oily water separating filter and oil discharge monitoring and control system.
where is the one place discharge of oily water is prohibited?
Antarctica area
what are special areas under MARPOL?(9)
Baltic sea
north west waters
Mediterranean sea
black sea
gulf
gulf of Aden
Caribbean
Oman area of the Arabian sea
SOUTH AFRICAN WATERS
What are the sources of oily water contamination?(4)
bilges
fuel systems
oil systems
CPP systems
how do we keep bilges clean from oil and contaminates? (6)
keep machinery spotless
monitor lube oil ready use tanks
no surfactants (kleen break only)
AFFF only to be used in real fires (not drills)
Eductors to be manned when in operation
maximise the use of shoreside facilities
what is the procedure following a spill?
let the OOD(in harbour) or OOW (at sea) know about any MARPOL incident
what is black water?
waste from WC, urinals, WC drains, medical compartments.