Marine Engineering Practice Questions and Answers-Part 2

This is
our second article in the Marine Engineering Practice Series which deals in
questions related to the troubleshooting of the ship machinery etc. Plus some
of the questions that might be asked to you when you are preparing for your officer
exam have also been discussed.

Here is
the first article in this series: Read here

How will you come to know that
EGB is leaking?           

·        
Abnormal decrease in Cascade tank water level
·        
White smoke from funnel
·        
Less production of Steam
·        
Exhaust Gas temperature going low.
·        
Rise in the level of soot collecting tank

How to check leakage in lube
oil cooler shell and tube type      

Tube leakage can result from
corrosion. This can be checked for, or identified, by having the shell side of
the cooler circulated while the cooling water is shut off and the end covers
removed. Any seepage into the tubes will indicate the leak. It is also possible
to introduce fluorescent dyes into the shell-side liquid: any seepage will show
under an ultraviolet light as a bright green glow. Leaking tubes can be
temporarily plugged at each end or removed and replaced with a new tube.

Main Engine Crankcase inspection
and what all checks to be done

1)                 
After the engine shutdown. Open doors after half
hour
2)                
Start from the bottom. Check for any sign color
change of lube oil. Search for any metal particles etc.
Ship Machinery
3)                
Look towards the main bearing and see if any
metal paste or particles are coming.
4)                
Bottom bearing clearance can be checked here.
5)                
Then we can take clearance crank bearing.
6)                
Check for any loose bolts.
7)                
Check on crank pin for any signs of crack.
8)               
Check the condition of crosshead guides and
their clearances.
9)                
Piston Rod needs to be checked for any signs of
scoring or deep scratches.
10)            
Run the lubrication pump to see the flow of oil.

Pre bunkering and During Bunkering
Safeties

Pre bunkering:
1)                 
High level Alarm of all fuel tanks has been
checked.
2)                
Pre Bunker meeting has been carried out.
3)                
The required amount of SOPEP kit is placed near
the bunker manifold.
4)                
All the deck scuppers have already been checked
and plugged.
5)                
Flag on the Ships is hoisted.
6)                
Emergency phone numbers are displayed at desired
location.
7)                
Bunker hose is in good condition and properly
tightened.
During Bunkering
1)                 
Mooring ropes and distance bunker barge from
ship is well maintained.
2)                
Check on both sides, that no oil is visible on
water.
3)                
Time to time sounding of tanks, manually.
4)                
At the end of bunkering, blow air from the
bunkering hose to clean it.

What Inspections to be carried
out in a Dry Dock of a Ship?     

1)                 
Propeller inspections like cavitations and drop
2)                
Rudder, hull
3)                
All the sea outlet valves
4)                
Condition of Sea chest
5)                
All the Cathodes condition
6)                
Condition of Thrusters if any

What is the composition of
inert gas in terms of Percentage?

·        
2-4% of Oxygen
·        
.2-.4% of Sulphur dioxide
·        
12-14% Carbon dioxide
·        
80% Nitrogen

Function of Inducer, impeller,
diffuser and volute casing in Turbocharger

Function of inducer is to have
sockless air flow at the entry of turbocharger. Inducer is to convert the
pressure energy into kinetic energy. Volute Casing as name suggest, the air
will come, and will get rotary motion through the impeller of the blow and will
be forced forward towards the diffuser. Diffuser helps in converting the K.E at
the inlet to P.E at inlet.

Reasons for oil coming out from
water side in purifier and remedy?

1)     
Gravity disc problem
2)    
Sludge bowl not closing problem
3)    
Incorrect Rpm
4)     
Too much feed flow to the purifier.

You Might Like to Read These Posts Too:

Mark Eriscson

Love to write about topics related to maritime sector. Was born in sailor's family, so love to ride on those high seas. In free time i would like to go for a good sunbath and some soothing guitar music. Want to have my own boat one day.

Leave a Reply

Your email address will not be published. Required fields are marked *

Special Topics For You

Read these

Marine Main Engine Alarms And Trips Here get to know about all the main engine alarms and Trips that we have for the main engine. Most of the times, this questions is asked by the oral...
Control of Emission from Ships Exhaust Smoke This article discusses about as how to control the emissions from the ships, thus reducing the air pollution caused by them. Annex 6 of MARPOL is al...
Naval Architecture Terminology and Coefficients of... The ship is defined in terms of its size and the shape. This is required to find out it’s characteristics for stability, resistance, power needed to...
Main Engine Exhaust Valve Parts, Working and Overh... Marine Diesel Engine nowadays employs the hydraulic mechanism of opening and closing the exhaust valve. Just like other machineries, it also require...
Every Day checks in Engine Room Rounds from Funnel... When a duty engineer is taking rounds, half of the problems or troubleshooting can be done by them, if they check the items below given properly. Th...
How to Start and Stop Fresh Water Generator Fresh water generator as name suggest is an machinery onboard which is used to generate fresh water for various purposes like drinking, washing etc....
Marine Sewage Treatment Plants, Regulations and Wo... Get to know about the marine sewage treatment plants working, types and regulations concerning the discharging of sewage in to the sea. The importan...
Marine Engineering Practice MEP Questions and Answ... In this article get to know about boiler burner maintenance, fuel injector testing, CO2 line testing, cylinder head testing and HP cut out problems ...
error: Content is protected !!