Fresh Water

Question 1

What’s OSMOSIS

Answer 1

Dilute solution naturally diffuses through a semi permeable membrane towards the region of higher concentration, in an attempt to equalise the solution concentration.

Question 2

What’s reverse osmosis

Answer 2

Applying, pressure in excess of the Osmotic pressure which reverses the direction of solution flow , thus producing dilute solution . This process increases the concentration of the concentrated solution

Question 3

Whats bar of pressure is osmotic pressure

Answer 3

55 bar

Question 4

When will we use FW Embarkation

Answer 4

When water that we get supplied is from an unknown source
(which may be contaminated with gut parisites)

Question 5

What BR is FW

Answer 5

BR 820

Question 6

What sizes are the filters and how many are there on the FW embarkation unit

Answer 6

2 filters
One filter is 3 microns
Second filter is 1 micron

Question 7

What’s type and size of disease does the fw embarkation unit filter out

Answer 7

Cryptosporidium - size 5 microns Second filter

Question 8

What does PoS do before rigging the FW on board and what for

Answer 8

-PoS will drain dock supply for around ten mins
-Due to stagnet water and to flush dirty water from system

Question 9

What are the points of testing on ship for chlorine

Answer 9

Gallery (scholarly) , pump discharge or and the furthers point on ships source/supply

Question 10

What are the chlorine levels supposed to be at within the tank and coming out of the tap

Answer 10

Tap - 0.2 - 0.5 ppm
Tank - 0.5 - 0.8 ppm

Question 11

What’s FRC and why do we need this in FW

Answer 11

FRC - free residual chlorine

Why, because we would rather have 1 extra chlorine in the system instead of none or just enough due to PoS may not know or have any way of knowing if there are bugs in the water so having that extra chlorine would tell you it’s clean and bug free.

Question 12

Where and when is chlorine levels logged ?

Answer 12

When, daily
Where on the logistics log

Question 13

Water temps Hot and cold ?

Answer 13

Hot- 60°or more
Cold-20° or less

Question 14

What is the RO plant made of and in what order

Answer 14

1.SW PP
2.sand filter
3.anti scalant dosing unit
4.cartrige filters
5.LP trip
6.HP PP
7.PRV
8.pulsation dampener
9.HP trip
10.membrane
11.flow meter
12.solenoid vv
13.conductivity meter
14.re-hardener
15.chlorine dosing unit
16.reject control vv