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

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

Pre bunkering and During Bunkering

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

Propeller inspections like cavitations and drop
Rudder, hull
All the sea outlet valves
Condition of Sea chest
All the Cathodes condition
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?

Gravity disc problem
Sludge bowl not closing problem
Incorrect Rpm
Too much feed flow to the purifier.

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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.

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