Theory 4 Flashcards by craig mitchell

How do you reduce water hammer?

Air eliminator

How well did you know this?

Not at all

Perfectly

1 symptom of air in a system is know as?

Water Hammer

How well did you know this?

Not at all

Perfectly

The 3 water tests?

Visual test
Chlorine
Taste

How well did you know this?

Not at all

Perfectly

Purpose of fresh water?

Laundry
Galley
Showers and sinks
Water heaters
Medical use
Bridge window washers
Fresh water hose reels
Machinery cooling
Gas turbine washing

How well did you know this?

Not at all

Perfectly

What does CCV valve stand for?

Concentration control valve

How well did you know this?

Not at all

Perfectly

How much does the bag filter filter down to?

60 microns

How well did you know this?

Not at all

Perfectly

What is the TDS figure of sea water ejected back?

56,000 TDS

How well did you know this?

Not at all

Perfectly

What is the TDS of fresh water after desalination?

Between 250 - 300 PPM

How well did you know this?

Not at all

Perfectly

What is the TDS of sea water?

34,000 PPM

How well did you know this?

Not at all

Perfectly

What is the measurement of water purity?

TDS

How well did you know this?

Not at all

Perfectly

What does TDS stand for?

Total dissolved solids

How well did you know this?

Not at all

Perfectly

What is reverse osmosis?

Turns sea water to fresh water

How well did you know this?

Not at all

Perfectly

What does a actuator do?

Converts hydraulic energy into mechanical energy

How well did you know this?

Not at all

Perfectly

2 types of actuator?

Rotary
Linear

How well did you know this?

Not at all

Perfectly

A axial piston pump has a …..?

Swash plate

How well did you know this?

Not at all

Perfectly

What is a axial piston pump used for?

Stabilizer systems
CPP systems
steering systems

How well did you know this?

Not at all

Perfectly

Purpose of the drain leg?

To return cooling, sealing and lubricating oil from the actuator to the tank

How well did you know this?

Not at all

Perfectly

6 types of gear pump?

External gear pump
Internal gear pump
Vane pump
Lobe pump
Single piston pump
Multi cylinder radial pump

How well did you know this?

Not at all

Perfectly

Common causes of contamination?

Airborne particles and moisture
Construction dirt
Dirt in new fluid
Dirt produced by wearing in new systems
Dirt from human sources

How well did you know this?

Not at all

Perfectly

5 oil additives?

Anti - foam
Anti - oxidants
Anti - corrosion
Demalsibility
Pour point depressant

How well did you know this?

Not at all

Perfectly

3 oils used in hydraulics?

OX30 - Red - used on submarines
OM33 - Yellow - used on Type 42,22
OX40 - Green - used on Type 23, 45

How well did you know this?

Not at all

Perfectly

2 types of oils?

Mineral
Synthetic

How well did you know this?

Not at all

Perfectly

Advantages of hydraulics over electric systems?

Reliable
Simple and easy to understand
Infinite speed range
Easily reversed
Ability to withstand overload
No spark risk
High torque at low speeds
1/12 size of equivalent electric motor

How well did you know this?

Not at all

Perfectly

What is a fluid defined as?

A substance that will take the shape of its container
Capable of transmitting power
Can a liquid or gas

How well did you know this?

Not at all

Perfectly

Disadvantages of hydraulics?

Fire risk on mineral oil systems Noise Risk of contamination Less efficient (85-95%)

What temperature do O ring sills fail/melt at?

300°C

What is crash stop?

Allows all fans to be stopped in case of emergency. I.E in case of a fire or crash

Where can crash stop be activated from?

HQ1 or the SSC

What PPE do you need when working with Fluorocarbon Elastomers?

PVC gloves PVC coveralls Rubber boots Full-face visor

What do air bleed valves do?

Maintain the citadel pressure at required amount above atmospheric pressure and maintains a degree of hability

5 steps of a citadel test?

1 - Close all openings on citadel boundary and put system on re-circ 2 - Open AFU inlets and start AFU's 3 - Restrict access to and from citadel to essential personal only (Airlocks must be used) 4 - Search for leaks and carry out repairs, 2 Inch vacuum is required 5 - Record the result of the test

When do you test the citadel?

- Annually - Prior to DED (Docking extended duration) - During harbor acceptance trails - During sea acceptance trails - All ships are required to carry out a citadel test during FOST work-up

Percentages of fresh and recirc air in ATU systems?

Fresh air = 33% Recirc air = 67%

6 types of common filters?

Panel filter Supply filters Grease filters Lint filters Dust filters Flameproof gauze's

Where would you expect to find "special filters"?

Galleys Store rooms Auxiliary machinery spaces Magazines Paint stores

4 basic combinations for supply and exhaust of ventilation?

fan supply and fan exhaust fan supply and natural exhaust natural supply and fan exhaust natural supply and natural exhaust

5 Equipment and uses that require ventilation?

Electric systems CBRN Habitability Main machinery space cooling galley ventilation

What does fruit and veg produce when it rots?

Carbon dioxide

when refrigerant gets hot what gas does it produce?

Phosgene gas (Mustard gas)

Chilled water plants are used to cool what?

Weapon systems Radars Ships computer system Air treatment units (ATU)

How can you add oil to the sump?

Sump filler pump Hand pump Dosing pot

What does hygroscopic mean?

Absorbs oil readily

3 Lubrication's used in refrigeration?

OM70 - general purpose used with CFC/HCFC Suniso 3GS - synthetic oil used on type 23 SW68 - synthetic oil used on R13A refrigerants

5 methods of leak detection?

IRLDS (Infra red leak detection system) Oil slicks Spectroline dye Snoop Halogen leak detector

3 means of heat transfer?

Conduction (direct contact) Convection (Radiators) Radiation (The sun)

4 Examples of on board refrigeration plants?

Cold room -18 to -22 Cool dry room +4 to +6 Fruit and veg store +4 to +6 Galley ready use cupboard +5 to +7

Cold room temperature?

-18 to -22

Cool dry dairy temperature?

+4 to +6

Fruit and veg store temperature?

+4 to +6

Galley ready use cupboard temperature?

+5 to +7

The 2 colors on a sight glass indicator?

Green = good = dry Yellow = bad = moisture

What is the Montreal Protocol?

CFC gases

What is the Kyoto Summit?

Reduces greenhouse gases

9 steps on bringing on fresh water?

1 - Must be flushed before use 2 - Unscrew the deck cap 3 - Fit the filing goose neck 4 - Connect hoses to shore supply 5 - Open the shore filling supply valve and flush 6 - Carry out water tests 7 - Shut off shore filling valve 8 - Connect hoses to deck filling goose neck 9 - Dip and record level in tanks

What color are fresh water hoses?

Blue

3 types of defrosting?

Natural Electrical heating coils Hot gas

When do you use hot gas defrosting?

Once a day 15 minutes 4 times a day

When do you use electrical heating coils?

Maximum 1 hour every 24 hours

When do you use natural defrosting?

Every 3-6 months normally at maintenance periods

What is Latent heat?

Changes the state of a substance but with no increase in temperature

What is Super heat?

Anything over 100°C

What is Sensible heat?

Temperature is rising but their is no change in state.

4 types of heat on the water steam table diagram?

Latent heat Super heat Sensible heat Sub cooling

What is the sub cooling stage on the water steam table diagram?

Just before 100°C around 90°C

What is demulsibility?

Ability of oil to separate from water

2 Types of hydraulic oils?

Petroleum Synthetic