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Mech Theory 4 > Fresh Water Production > Flashcards

Fresh Water Production Flashcards

1
Q

What are the four uses of fresh water?

A

Drinking
Washing
Cooking
Cleaning

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2
Q

What 8 services are provided by the fresh water system?

A

The Laundry
The galley
Showers and sinks
Water heaters
Medical use
Bridge window washers
Fresh water hose reels
Machinery cooling

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3
Q

What is the definition of reverse osmosis?

A

Transfer of water from salt water through a semi permeable membrane into pure fresh water.

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4
Q

What does TDS stand for?

A

Total Disolved Solids

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5
Q

What is the TDS of salt water before and after desalination?

A

Before: 34,000ppm
After: 250 - 300ppm

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6
Q

What percentage of supplied sea water is ejected overboard?

A

80%

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7
Q

What is the name of the desalinated water?

A

Permeate

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8
Q

What is the name of waste water after desalination and what is the concentration of salt in this solution?

A

‘Concentrate’
56,000ppm

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9
Q

Describe the two stages of filtration in an RO plant

A

Bag filter - filters down to 60 microns
Bank of two cartridge filters - filters down to 10 microns.

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10
Q

Describe the HP pump on an RO system

A

3 piston positive displacement pump. Pressure up to 65 bar.

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11
Q

What part of the RO plant does reverse osmosis take place?

A

In the cushion membranes

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12
Q

What is the purpose of the anti-scalant dosing unit?

A

Prevents precipitation of calcium salts directly forming on the membrane surfaces.

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13
Q

What is the name of the anti-scalant used?

A

Hypersperse

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14
Q

What does CCV stand for?

A

Concentration Control Valve

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15
Q

What is the purpose of the CVV?

A

Controls the back pressure of sea water acting on the Membrane Cushions. This forces more or less water through the membranes, which controls the total TDS of made water.

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16
Q

How often is the chlorine content checked?

A

Daily and before embarkation

17
Q

What level is the chlorine content maintained at?

A

0.2ppm

18
Q

What colour are the hoses used to embark fresh water, and what are the two things that must be done prior to embarking?

A

Hoses are blue.
Must be flushed through before use and tests must be carried out on the fresh water.

19
Q

What are the three tests carried out on fresh water?

A

Visual test
CHEMets test
Taste test

20
Q

How is hot water provided?

A

By the use of calorifiers

21
Q

What is the “water hammer” effect and how is it removed?

A

A loud, repetitive banging noise inside the pipes which is a symptom of trapped air. Removed using an air eliminator.

22
Q

How often are fresh water levels checked? How are they checked?

A

Checked hourly with dip tape

23
Q

What are the three parts of the cushion membrane?

A

Membrane
Fleece sheet
Ultrasonically welded edges

Mech Theory 4 (4 decks)

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