Varnham 2 Flashcards by Lewis Varnham

State 4 method of embarking fuel when along side

Road bowser

Direct jetty pipe line

Jetty storage tanks

Barge

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Why are fuel tanks positioned at the lowest part of the ship

To keep the ship less buoyant and maintain the balance of the ship so that it doesn’t capsize

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What is the purpose of the fuel tank filling valves

The purpose of the filling valves is to control the level in the tank

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How does centrifuge pump separate fuel from water

Centrifugal pump spins at 5000RPM
Spraying the heavy substance which is the water further away
This separates the water from the fuel

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What percentage are the undisplaced tanks filled to

90%

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What is the purpose of the coalescer and to what level

The device is fitted to remove water droplets down to 10ppm that may be in the fuel

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Purpose of the fuel pre filters and to what level

To remove any fine particals of dirt down to 5 microns

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What materials may the filters be made from

Yarn, paper, felt, wool

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How is the ready use tank level maintained

Fuel fills up the tank pushing up the float valve when it get the the designated level, causing the flap valve to open. When the fuel decreases the flap favs goes back down

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What is MBG and where would it be found

Micro biological growth and can be found in contaminated diesel

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State 4 fuel tests briefly and explain

Visual test-fuel must be clear and bright with no obvious signs of dirt, sludge,water
Water reaction test-water reaction 20 ml of water added 80 ml of fuel is left to set see if more water builds up
Colour test-fuel will become darker as old it gets and is compared to colour slides
Diesel fuel filtration test kit-passing a sample through a filter monitoring how quickly filter becomes blocked

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What are hazards associated with fuel

Fire and explosion

Toxcity

Dermatitis

Pollution

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What does CODLAG stand for

Combination of diesel electric and gas

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What type of gas turbine is fitted to a type 23 and how many

2 speys

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What are the advantages of a gas turbine fitted to an RN ship

Am ability get underway quickly
High weight ratio/power
Minion ship board maintenance 
Low manpower requirement 
Ease of operation with the emphasis on remote contoll

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Fully explain 3 stage filter

Water eliminator removes water droplets and any water from the air.

Knit mesh filter removed any dirt and any fine particles

Last water eliminator removes any water left in the air .

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Explain the splitter silencer

Unit consists of perforated vanes filled with sound absorbing material that smooths out air flow removing any turbulence and noise

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Explain the transition duct

The transition duct provides a smooth change from a square cross sectioned air flow to a circular cross sectioned air flow without creating any turbulence

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Explain the cascade bend

The cascade bend directs airs through a 90 degree bend without causing any turbulence to the ready smoothed out air flow

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Explain engine intake flare

Engine intake flare seals the engine intake from the rest of the module and houses the water wash ring

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Fully explain how the module ventilation systems works

The depression of air is formed by the rushing exhaust gasses due to Bernoulli’s Therom

Air is drawn into the module because of the depression formed at the other end

Air circulates around module keeping it cool

Vent flaps must always be open

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How compresses driven

Compresses are driven by their respective turbines

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Purpose of the power turbine

The power turbine directly drives the input shaft of the gearbox which in turn drives the propellor shaft

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What is reason for mag chips, where are they fitted, how often are they checked

Mag chips are fitted into a scavenge oil system
Collect bits of ferrous metal that have broken away from the engine . Give an early indication of wear/ malfunction

Inspected every 24 hours of the running has turbine

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What oil is used in Spey gas turbine

OX22

State 6 safety devices fitted to a has turbine

``` Hand trip Fire detectors Power turbine entry temperature Partial overspend safety device Vibration monitor Power turbine over speed ```

Explain partial over speed trip

If the engine over speeds the propeller comes out the water, this device reduces the quantity of fuel supplied to reduce the engines speed

Hazards associated with gas turbines

Igniters | Noise

Precautions must be adhered to when with working with igniters

Produce sparks voltage excess 2000 v, After use igniters and associated circuitry must not be touched for at least 5 minutes to allow stored electrical energy to discharge

What fire system is fitted to gas turbine module

Fire detector

What checks are performed every hour on a running gas turbine

Pressures+temperatures Oil levels Noise+vibration Leaks

Explain wet motoring

Wet motoring is carried out after maintenance has been undertaken on the engine fuel system, to confirm its operation and to vent off any air from the system.

Explain dry motoring

To purge the combustion chamber of any unburnt fuel and explosive gasses To turn over compressors to enable washing and inhibiting routines to be carried out

How do we inhibit them components of gas tubing against corrosion when not in use

Spray PX24 into the engine to disperse the moisture and to coat and protect the internal parts of the engine

What are the main functions of a gearbox

Transmit power from prime mover to shaft Allow for variation in speed and power Allow for changed between ahead and astern thrust

What are the main components of a gear box

Pnions Wheels Quill shaft Casings

How do you change speed of a gear train

Add a differnt size gear

State 4 type of gear profile

Straight spur gear Helical gear Double helical gear Worm gear

Explain the construction and advantages of double helical gear

The double helical gear are opposing angled teeth form a V The advantage of this is that it produces thrust in both direction cancelling out the thrust

Explain the construction and advantage of a worm gear

Work gear resembling a screw with continuous tooth forming parallel helical teeth Advantage that can join shafts together that are 90 degrees at each other

State the three methods of gear reduction

Single gear reduction Double gear reduction Double gear reduction duel tandem

Explain the purpose of the quill shaft

Quill shaft acts as a torsional spring, twisting along its length .by having the ability to move load can be evenly distributed and any misalignment can be compensated for

What checks are carried out when applying break pads

Ensure no risk exists All break pads are applied The shaft is stationary

Break checks on removal of break

All pads are clear No fire danger exists The shaft is turning

Purpose of the thrust block

The purpose of the thrust block is to absorb forces from the action of the propellor and transmit it to the ships hull

Purpose of the turning gear

Slowly rotate the shaft and propellor for docking

Purpose of the Plummer block

The ship Plummer block are use to support the weigh of the shaft without absorbing any thrust

Purpose bulkhead gland seal

Bulkhead gland seal purpose it to maintain water tight integrity as the shaft passes through compartments

Purpose of the stern seal

The stern seal is to maintain water tight integrity as the shaft passes through the ships hull

Purpose of A bracket

The purpose of the A brackets are to support the weight of the propellor shaft

What principle does a plummer block use for lubrication

Michaels principle

What substance does a bulkhead gland seal use

Grease

What is fitted to a stern seal in the event of an emergency

Emergency inflation seal

What do A brackets use for lubricantion

Sea water

What are the three sections of the shaft line

Thrust shaft, intermediate shaft, tail shaft

How are the thrust shaft and intermediate shafts connected

Flanges with a ring of nuts and bolts

How are intermediate and tail section connected

SKF coupling The intermediate shaft and tail shaft are connected by SKF coupling which is a hydraulic coupling and is designed so that the tail shaft can be split from the intermediate shaft without leaving the flange

What are the two type of propellor

Fixed propellor Control pitch propellor

How is the gearbox kept at the correct temperature

Serkstat

Purpose of the FL cut in

Check cut in pressure of the motor driven pump should the gear driven pump fail