fresh water 4

Question 1

what is reverse osmosis?

Answer 1

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

Question 2

what is water quality measured by?

Answer 2

Total Dissolved solids

Question 3

what is the approximate TDS of Sea water?

Answer 3

34,000PPM

Question 4

what is the TDS of the permeate after desalination?

Answer 4

250-300PPM

Question 5

what is concentrate and its TDS?

Answer 5

the waste water from desalination
TDS = 56,000PPM

Question 6

What percentage of the supplied sea water is ejected?

Answer 6

80%

Question 7

what is desalinated water called?

Answer 7

permeate

Question 8

what is the value of the bag filter?

Answer 8

60 microns

Question 9

what is the value of the cartridge filters?

Answer 9

10 microns

Question 10

why do we need pre-filters?

Answer 10

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

Question 11

what pump is used in the RO system?

Answer 11

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

Question 12

why is the accumulator before the pump?

Answer 12

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

Question 13

what does CCV stand for

Answer 13

Concertation control valve

Question 14

why is the CCV important?

Answer 14

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

Question 15

what is the anti-scalant used in RO plants

Answer 15

hypersperse like Calgon for the RO plant

Question 16

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

Answer 16

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

Question 17

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

Answer 17

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.

Question 18

state the uses of fresh water?(9)

Answer 18

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

Question 19

what are the four sections of water use?

Answer 19

Drinking
Washing
Cooking
Cleaning

Question 20

what colour are fresh water hoses?

Answer 20

Blue
only used for fresh water

Question 21

why do we flush fresh water hoses before use?

Answer 21

to flush out any dirt or dust before filling

Question 22

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

Answer 22

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

Question 23

what do we use to heat water onboard?

Answer 23

A calorifier

Question 24

why do we use air eliminators?

Answer 24

to reduce “water hammer”

Question 25

label the diagram

Answer 25

Question 26

label the diagram

Answer 26

Question 27

greatest jedi of all time

Answer 27

grand master jedi rey skywalker