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ME-175-22-03 > fresh water 4 > Flashcards

fresh water 4 Flashcards

1
Q

what is reverse osmosis?

A

pushing salt water through a semi permeable membrane to get drinking water.

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2
Q

what is water quality measured by?

A

Total Dissolved solids

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3
Q

what is the approximate TDS of Sea water?

A

34,000PPM

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4
Q

what is the TDS of the permeate after desalination?

A

250-300PPM

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5
Q

what is concentrate and its TDS?

A

the waste water from desalination
TDS = 56,000PPM

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6
Q

What percentage of the supplied sea water is ejected?

A

80%

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7
Q

what is desalinated water called?

A

permeate

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8
Q

what is the value of the bag filter?

A

60 microns

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9
Q

what is the value of the cartridge filters?

A

10 microns

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10
Q

why do we need pre-filters?

A

to remove particles down to 10 microns before going to the semi-permeable membrane

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11
Q

what pump is used in the RO system?

A

a 3 piston HP pump that goes from 10-65 bar

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12
Q

why is the accumulator before the pump?

A

to dampen the suction from the pump to protect the filters.

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13
Q

what does CCV stand for

A

Concertation control valve

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14
Q

why is the CCV important?

A

it controls the pressure of the system which affects the volume produced and the quality.

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15
Q

what is the anti-scalant used in RO plants

A

hypersperse like Calgon for the RO plant

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16
Q

why do we add a anti-scalant to the RO plant?

A

to maintain the efficiency of the membranes and prolongs their life.

17
Q

what do we do to kill dangerous bacteria in the permeate
and when is the level is checked ?

A

add chlorine and the level is maintained at 0.2 PPM and is checked daily and before embarkment
section head will authorise and supervise addition of chlorine to fresh water.

18
Q

state the uses of fresh water?(9)

A

laundry
galley
showers and sinks
water heaters
medical use
bridge window washers
FW hose reels
machinery cooling
gas turbine washing

19
Q

what are the four sections of water use?

A

Drinking
Washing
Cooking
Cleaning

20
Q

what colour are fresh water hoses?

A

Blue
only used for fresh water

21
Q

why do we flush fresh water hoses before use?

A

to flush out any dirt or dust before filling

22
Q

what test do you do when embarking water or daily ?(3)

A

Visual (clear sample)
CHEMets kit (test for chlorine)
taste test (always done last)

23
Q

what do we use to heat water onboard?

A

A calorifier

24
Q

why do we use air eliminators?

A

to reduce “water hammer”

25
Q

label the diagram

A
26
Q

label the diagram

A
27
Q

greatest jedi of all time

A

grand master jedi rey skywalker

ME-175-22-03 (15 decks)

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