fresh water Flashcards
what’s reverse osmosis?
where pressure is applied to salt water, it’s forced through membranes and what’s left is fresh water
total dissolved solids
and the statistics
in which water purity is measured, lower the TDS the purer the water
seawater is approx 34000ppm
normal water is approx between 250 & 300ppm
80% is ejected back into the sea at 56000ppm
what’s desalination?
the removal of salt from seawater
bag filter
60 microns
filters after the bag filter?
cartridge filter
10 microns
CCV valve name
concentrate control valve, controls back pressure from the membrane stacks, in turn effects water quality
accumulator use
to remove suction
TDS
total dissolved solid
purpose of fresh water
laundry
galley
drinking
showers & sinks
machinery cooling
medical use
fresh water hoses
blue in colour
flushed with fresh water before use
unscrew deck cap to filling connection
fit the filling gooseneck to the filling connection
connect to shore supply
open the valve and flush it out
carry out water tests
shut off supply filling valve
connect hoses to deck gooseneck
take a dip tape reading and record it
open up the tank filling valve
open up the shore filling supply valve
open up the ship’s main freshwater filling isolating valve
regularly take content levels
regularly take water samples and tests
types of water tests
Visual test
CHEMets test (Chlorine)
Taste test
what’s fitted to an air system and to reduce what?
an air eliminator is fitted to reduce the effects of water hammer, banging within the pipes which is trapped air
who authorises the addition of the chlorine to the water
the section head would authorise it
