MEK Machinery Questions

This is a device which controls flow of fluid Passing through it.

Globe valve, Gate valve, Butterfly valve. Ball valve, Cock Valve

Joint is used to prevent leakage from two fixed surfaces. like pipe flange, valve cover, pump Casing etc.

Packing is used to prevent leakage between the Casing and rotating shaft of pumps or rotating spindles of valves.

Mechanical Seal

joint is used to prevent leakage between two surfaces whereas packing Packing is used to prevent leakage between the Casing and rotating shaft of pumps or rotating spindles of valves.

Meterial:-Cotton, jute, flax

This type of valve allows flow in one direction only closes automatically if there is flow from the opposite side.

6.Where do you find Quick Closing Valves fitted/ Its purpose ? Where from it is operated and what are the different means of operation of the quick closing valve?

Quick closing valve is found in every outlet of the fuel oil tank except the Double bottom tank.

Quick closing valve is operated in the remote location outside the E/R.

It is used in the case of fire in the engine room and can be easily closed from outside the engine room.

Tight the gland nut ,if leakage does not stop put some more turns of packing or renew the complete packing

Isolate the valve of the system, dismantle all the parts ,clean and check all the parts,check the proper size and Thickness of packing to make sure the packing ends are cut 180 degree apart .

Pump is a device that pressurises the fluid Passing through it.

Reciprocating Pump:- Pumping bilge water

Gear Pump:- Pumping oil, Pumping lube oil for auxiliary engine.

Screw Pumps:- Pumping Lube oil for main engine,pumping Fuel oil pumping sludge.

Centrifugal Pump:- Ballast System, Cooling water system,Cargo oil in tanker

For positive displacement Pump:-Open both suction and discharge valve, oil level in gear case (in case of reciprocating pump),turn the pump by hand to check freeness,main switch on.

For Centrifugal Pump :- Open suction valve,close discharge Valve, turn the pump to check freenas,make sure the pump chamber is full with the liquid, Discharge valve to be opened slowly when discharge pressure is Steady.

Suction and Discharge pressure, motor load, motor temperature, any leakage, Abnormal noise of vibration.

filtration, purification by the gravity in the settling tank, purification

It compresses atmospheric air to higher pressure.

1.Starting main and Auxiliary diesel engine

2.Operation of some machines and Tools

3. Blowing ship whistle

4. Pneumatic Control System

5. Cleaning different parts

6. Charging hydrophore system

Cock - it is used for blowing through gauge glass in a boiler.

Drain- used to drain oil and water in air bottles.

Fusible plug- when the air bottle rises….

Relief valve- it releases excess pressure.

Manhole door- for internal inspection and repair of different purposes of the job.

1.Drain oil & water from Air Bottle 2.) secure the flexible pipe properly and hold the pipe end firmly 3.) open the correct pressure valve slowly 4.) Direct the air to part only for cleaning 5.) Never direct the Air to any person or parts. any other

1. Check the lube oil level in crankcase is normal.

2. Check the filling valve of the air bottle is open.

3. Check Compressor discharge valve is open.

4. Check Cooling water valves are open.

5. Turn the compressor to see it is free.

6. Open H.P and L.P drain valve.

7. Check the main Power switch is on position.

8.Now the compressor is ready for starting

1. Check Lube oil Level in crankcase is normal.

2. Check Lube oil pressure is normal.

3. Check air bottle pressure gauge if it is increasing

4. Check HP and LP stage pressure are normal.

5. Check the temperature of cooling water and discharge air are normal.

6. Check compressor is taking normal load.

7. Check Unloader operates as per timer.

8. Check no abnormal noise and vibration.

9. Check the motor temperature. 10. Check for air and water leakage.

It generates and distribute steam

1.Steam stop valve 2.water feed check valve

3.Steam pressure gauge

4.Two water level gauge glass

5.Two Safety valves

6.Air vent valve

7.Man hole door.

8.Blow off Valve Cock

1.Oil fired boiler

2.Exhaust gas boiler

1.For heating heavy fuel oil in storage tank,for heating heavy oil in settling tank.

2.For heating heavy fuel oil for main Engine

3.For heating heavy oil & lube oil for purification

4.For heating domestic fresh water

5.For heating accomodation in cold climate

1 Steam pressure 2:water level in both gauge glass fuel oil pressure and temperature 4 flame condition

By blowing through

economiser is act as heat exchanger use as preheater it preheat water which has to be feed in boiler

1.Clean & Check water and Steam space

2.Verhouding of all mountings 3 Rectify defects in safety or Automation systems. 4 Rectify Steam & water Leakage from any pipe joints.

Compressor , evaporator, condenser

1.Suction pressure

2.Discharge pressure.

3.Lube oil pressure

4.Lube Level

5.All rooms' temperature.

6.Motor Load..

It increase the friction between sliding parts

Increase temperature of sliding parts

Bearing will be damaged

Not smooth operation will be carried out

It will cause

Pressure drop

Increase friction between sliding parts

Increase temperature

Rotating parts will get overheated and engine may be seized

1.Flame proof boiler suit with apron(lather).

2. Safety helmet

3. Eye protective shield

4. Lather gloves

5. Safety shoes

6. Aram guard

There are two types of welding

1.Electric arc welding

2.Gas welding

1.Electric step down transformer

2.Electric welding cable

3.Earth clamp

4. Electrode holder

5. Electrode

6.Wire brush

7. Chipping hammer

1.Oxygen cylinder

2. Acetylene cylinder

3. Pressure gauge

4. Pressure regulator

5. Gas welding torch

6. Gas welding pipe

7. Filler rod

8. Chipping hammer

9. Wire brush 10. Spark light

The arc length should be equal to the diameter of the electrode.

1. Flat Bead

2. Loose Penetration

3. Coarse Splatter

1. Uncontrolled penetration slag

2. Electrode stuck to the weld plate

1. Select the electrode size

2.Current required for the size of electrode

9. The welding Transformer increases or decreases the electric current? It always increase at the secondary side. 10. Dimension of the cable of the earth clamp should be equal to the dimension with what other cable? Arc welding cable 11. Why are electrodes kept in dryers? To kept electrodes dry and prevent oxidation. 12. What safety precautions you will take before commencing welding. For Arc welding

1.Wear proper PPE.

2.Most take a hot work permit.

3.Check any leakage in arc welding cable

4.Connect one end of earth clamp to weld plate and other end to power source

5.Keep fire extinguisher nearby.

6.Welding area should be free from flammable items. For Gas welding

1.Wear proper PPE.

2.Most take a hot work permit.

3.Check gas welding pipe leakage or not

4.Check pressure gauge and regulator in working condition

5.Keep fire extinguisher nearby.

6.Welding area should be free from flammable items 13. How will you recognise the gas cutting torch and gas Welding Torch? Gas cutting torch

1.It has two pipes(1)For oxygen(2) Oxygen and Acetylene mixture

2.It has a leaver to control oxygen

3.It has multiple holes at the tip. For Gas welding torch

1.It has a single pipe with only one hole at the tip. 14.What gas is used in gas welding? Oxygen and Acetylene .

1.Wear proper PPE safety helmet, safety goggles, tight and dry boiler suit

2. Don't put the chuck key on a chuck

3. Jaw should be proper centering

4. Cutting tools should be proper grinded and centering

1.Lathe machine

2.Grinding machine

3. Electric arc welding machine

4.Gas welding machine

5. Drill machine

6.Bending machine

To avoid personal injury from touching the rotating parts.

1.Safety guard

2. Emergency off switch

3.Isolator

4.Locking mechanism

Valves & pumps Purifiers boiler Air compressor Auxiliary generators Fresh water generator sewage treatment plant Air condition hydrophore ER ventilation Incinator Cargo handling Gear

valves are use for control flow of all liquids and air .

Globe Valve(screw Type stop and non return)-steam,air,water,oil Gate Valve-ballast line,cargo line, Sea water line, bunker line butterfly valve- deck line,over board discharge Strom valve- accomodation over board discharge cock valve-cargo line on chemical and oil tankers Check valve(flow in one direction)- Overboard discharge,feed valve in boiler Spring Loaded- Safety valve, relief valve solenoid valve- Automatic electric operated -water or oil line

Hand wheel, spindle,stuffing box, valve cover, valve disk, valve seat, casing

hand wheel,yoke,yoke bush,gland, gland bolt,bonnet,gland packing,stem, seat,body,flange stem nut,disk,disk

Reciprocating Pump(PIston Type)- Bilge pump Gear Pump-Fuel oil and lube oil purpose Screw Pump- main engine lubrication & fueloil transfer Centrifugal Pump - Sea water And Fresh water circulation,cargo pump on tanker

priming is a process for removing air from Pump System(Centrifugal Pump).

check Pressure,load(motor AMP), vibration, Leakage from gland or seals, temprature of motor

joints gasket and packings are used for prevent leakeges from between two parts like pipe flange,valve cover,valve body,cylinder head etc,

Rubber,copressed sheet, cork, felt, sponge, plastic,thermal meterial

oil is use for As Fuel- diesel, low sulpher fuel oil, heavy fuel oil As Lubrication- ME, AE, Compressor, purifiers As power Transmission- hydraulic operation, crane operation, mooring winch,windlass As Heating mediumQ. type of filter use on board filter are used for fuel and lube oil cleaning Strainer - for removing large solid particals Auto clean filter- for removing solid particle by self cleaning fetures Centrifugal purifier-for removing tiny solid particale,water, sludge

it is used for domestic water supply by pressurize tanks.

Boiler is used for steam generation,and steam use for fuel oil heating, oil purification, domestic air and water heating, cargo heating on oil tanker. Type of tanker1.water tube type- high pressure 2. smoke tube type-Low pressure

2safety valve - 2 gauge glass - steam stop valve -feed check valve - pressure gauge - blow off cock - man hole door

Water level in boiler and hot well - steam pressure - leakegs from joints - feed pump operation

OWS remove oil traces from bilge water. it is important machine according MARPOL rule . water discharge allow automaticaly by monitor system if Oil content below 15PPM

it is system fitted onboard according MARPOL Rule for treat and discharge of human waste. it have 3 chamber-aeration chamber, settling chamber, clorination chamber

it is machine that is use for getting compressed air up to 30 bar

Air suction filter Low pressure safety valve high pressure safety valve Low pressure stage pressure gauge high pressure stage pressure gauge lube oil gauge pressure gauge discharge pressure gauge thermometer lube oil pump lube oil filter thermostate solenoied valve busting disc

check lube oil level - open discharge And air bottel filling valve - open cooling water inlet and outlet valve - check unloder are open - start motor

oil level -temprature -discharge pressure -cooling water supply - abnormalities(vibration and sound)

1. Starting Air For M/E, A/E (20-30 Bar)

2. Servive Air(7 Bar) cleaning, tools operations, gangway motor, penumatic machinery 3 controled air(7 Bar)

Filling valve, M/E Starting Supply, A/E Starting Supply, service air supply,controled air supply, Drain Valve, Pressure Gauge, Man hole door,Relief Valve, Fusible Plug.

For Turning- Reduce The Diameter OF work Piece Facing- Reduce the Length of work Piece Knurling- Making Grip on rod Parting- Cutting in two parts Threading- Thread Making Drilling- Making Axile hole in ciculer rod Boring- enlarging the axile hole dia Chamfring- removing sharp edge

Motor, Fly Wheel, V belt,Engage and disengage lever, step cone pully, fly wheel gaurd , gear box, reverse & forward switch, head stock, spindel sleeve,driver plate, three jaw chuck, live center, carriege, tool post, compound rest, thread dial indicator, cross feed lever, half nut lever, handwheel, apron,lead screw, feed rod, dead center, tail stock , bed, set over screw,chip tray ,

Use Proper PPE ( safety Goggels) never use Hand Gloves , proper Centring work of workpice (no bubbling), tight tool, correct position of tool

welding is a fabrication process that joining meterials causing fusion or melting the meterial. Welding type - Arc welding, gas welding,fusion welding safety precaution- PPE( Flame proof Boiler Suit, Spat, Leather Apron, Leather gloves, welding Helmet(60X110M)

Electrod holder, electrod,welding cable, earth clamp, electrode dry case, welding machine,

Gas Welding- welding torch, pressuregauge and regulator, oxygen and acytelen tube, flash back arrestor,oxygen and acytilin cylinder, spark lighter, appretus wrench Gas Cutting- torch, pressure gauge and regulator, oxygen and LPG, flash back arrestor,oxygen and acytilin cylinder, spark lighter, appretus wrench

lagging is insulagting material wrapped around pipes,tanks to prevent heat loss. Insulation Material- Glasswool, rock wool, shredded paperm plaster of paris, cement bricks