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.
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
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
Abnormal decrease in Cascade tank water level
·
White smoke from funnel
White smoke from funnel
·
Less production of Steam
Less production of Steam
·
Exhaust Gas temperature going low.
Exhaust Gas temperature going low.
·
Rise in the level of soot collecting tank
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.
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
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.
Start from the bottom. Check for any sign color
change of lube oil. Search for any metal particles etc.
3)
Look towards the main bearing and see if any
metal paste or particles are coming.
Look towards the main bearing and see if any
metal paste or particles are coming.
4)
Bottom bearing clearance can be checked here.
Bottom bearing clearance can be checked here.
5)
Then we can take clearance crank bearing.
Then we can take clearance crank bearing.
6)
Check for any loose bolts.
Check for any loose bolts.
7)
Check on crank pin for any signs of crack.
Check on crank pin for any signs of crack.
8)
Check the condition of crosshead guides and
their clearances.
Check the condition of crosshead guides and
their clearances.
9)
Piston Rod needs to be checked for any signs of
scoring or deep scratches.
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.
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.
High level Alarm of all fuel tanks has been
checked.
2)
Pre Bunker meeting has been carried out.
Pre Bunker meeting has been carried out.
3)
The required amount of SOPEP kit is placed near
the bunker manifold.
The required amount of SOPEP kit is placed near
the bunker manifold.
4)
All the deck scuppers have already been checked
and plugged.
All the deck scuppers have already been checked
and plugged.
5)
Flag on the Ships is hoisted.
Flag on the Ships is hoisted.
6)
Emergency phone numbers are displayed at desired
location.
Emergency phone numbers are displayed at desired
location.
7)
Bunker hose is in good condition and properly
tightened.
Bunker hose is in good condition and properly
tightened.
During Bunkering
1)
Mooring ropes and distance bunker barge from
ship is well maintained.
Mooring ropes and distance bunker barge from
ship is well maintained.
2)
Check on both sides, that no oil is visible on
water.
Check on both sides, that no oil is visible on
water.
3)
Time to time sounding of tanks, manually.
Time to time sounding of tanks, manually.
4)
At the end of bunkering, blow air from the
bunkering hose to clean it.
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
Propeller inspections like cavitations and drop
2)
Rudder, hull
Rudder, hull
3)
All the sea outlet valves
All the sea outlet valves
4)
Condition of Sea chest
Condition of Sea chest
5)
All the Cathodes condition
All the Cathodes condition
6)
Condition of Thrusters if any
Condition of Thrusters if any
What is the composition of
inert gas in terms of Percentage?
·
2-4% of Oxygen
2-4% of Oxygen
·
.2-.4% of Sulphur dioxide
.2-.4% of Sulphur dioxide
·
12-14% Carbon dioxide
12-14% Carbon dioxide
·
80% Nitrogen
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.
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
Gravity disc problem
2)
Sludge bowl not closing problem
Sludge bowl not closing problem
3)
Incorrect Rpm
Incorrect Rpm
4)
Too much feed flow to the purifier.
Too much feed flow to the purifier.
