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2014-11-12T15:17:43.106+05:30

International Sewage Discharge Connection

The purpose of the International Sewage

Connection is to enable pipes of reception facilities to be connected with the ship's Sewage discharge

pipeline, both lines shall be fitted with a standard discharge connection so that it can be easily

coupled.

bijoy chandrasekharhttps://plus.google.com/1030585643156550759020

2014-11-12T15:13:16.030+05:30

Why Low Expansion Foam Used On Deck And High Expansion On Engine Room?

High expansion foam, since its expansion ratio being high and its density

being low, will be blown off by air if we use it on the deck .
High expansion foam is used in engine room because the engine room being a closed

compartment, the foam can completely fill the same


2014-11-18T14:35:37.788+05:30

Abbreviations You Should Remember For M EO Class IV

Here listing out the important abbreviations and their expansions for maritime

exams. Please use CTL+F to search on this page.

>IMO -International Maritime

Organisation

>ISM -International Safety Management


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2014-10-23T18:18:35.438+05:30

What Is Free Surface Effect? How To Reduce Free Surface Effect?

Free Surface Effect

When a compartment is not completely filled with liquid it

is said to have a free surface that tends to remain horizontal . As the ship inclines,the liquid flows to the

lower side (in the direction of inclination)thereby increasing the inclining moment.


2014-10-20T22:50:30.468+05:30

What Is Virtual Tappet?

Unlike Aux Engines which have a manual tappet toadjust, there must be a tappet clearance for the Main Engine as well. But with the absence of a rocker arm and spring how do we adjust the so

called TAPPET?

The answer lies in the fact that there is no real tappet in the

main engine.

Marine s itehttps://plus.google.com/1079445266033088721793

2014-10-30T08:45:15.596+05:30

Naval Architecture Oral Questions With Answers

Here we have tried our level best to

list almost all probable questions in naval architecture. As it is impossible to answer all questions at a time

we are doing it on timely basis. If you find that we have missed out any questions ,please hint us by

commenting below.


2014-10-13T23:28:13.990+05:30

Change In Center Of Gravity Of Ship According To M ass Added/Removed or Shifting ofmasses

Center of Gravity plays a significant role in the ship's stability.Adding or moving

masses from one point to another in any direction will affect the position of center of gravity

.

How Center of gravity Changes due to adding weights (Loading)

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2014-10-11T14:21:28.381+05:30

Understand Bilge Keel And Its Purpose

Bilge keel is the longitudinal structure that runs along much of the length down to the lower side

of ship' s hull to reduce the rolling motion of the ship

Purpose
>Dampen the rolling

motion of the ship
>Increase longitudinal

strength


2014-10-11T15:13:51.151+05:30

Stiff And Tender Ships

Stiff

Ship
>Those ships with large

metacentric height having a large righting moment at small angle of heel, which is difficult to incline and

which will return to its original position so quickly are called a stiff ships.
> This type of ships does not

offer a comfortable ride, for the time period to return to its original position is very small


2014-10-14T23:45:06.632+05:30

How to Check Starting Air Valve Leakage

While Engine Is Running

> While engine is operating hand

touch the adjacent pipe, if its hotter than others it leaks

In Port


2014-10-11T15:34:36.490+05:30

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Righting moment and Righting Lever

When a ship is inclined at an

angle, the center of gravity remains the same. But the center of buoyancy changes over to a new position,

creating a moment called righting moment.

Righting moment calculation
Consider an instance:
Let the

initial center of gravity of a ship be G and its center of


2014-10-11T15:46:38.509+05:30

What Is Cente r Of Grav ity, Center of Buoyancy And Meta Center Of A Ship

Center Of Gravity
> The weight of the ship is distributed all over its length and is acting

downwards. we can consider that all the weight of the ship is acting downward, through a single point which

is called the Center of Gravity
>You can

simply say that weight of the ship acting downward through one point is called CG
> CG of ships can be calculated through inclination

experiment


2014-10-07T21:35:03.032+05:30

Coefficients of Form And Its Significance

Cofficents of forms are used to understand the

shape or configuration of ship and dimensions of the ships.These are dimension less

quantity.

Waterplane Coefficient (Cw): It is the water plane area

divided by multiplication of length and breadth.
Cw = Aw / B*L


2014-10-11T15:56:05.038+05:30

When a ship is said to be Equilibrium,Stable,Unstable And Neutral equilibrium

Equilibrium

When the ship is in upright position, the force of buoyancy(up thrust) and

the force of gravity(weight) acts through the center of buoyancy B and the Center of gravity G respectively,

in the same vertical line. Then the ship is said to be in equilibrium.

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2014-09-28T13:16:28.648+05:30

Principle Of Flotation, Archimedes Principle, Buoyant Force and How Ships Floats

Buoyant Force
> When a body placed in a fluid, the fluid exerts an upward force

which is called buoyant force. The buoyant force is the pressure exerted on the body by the

fluid.
>Pressure increases as the

depth increases, the pressure on the bottom of an object is always larger than the force on the top. So the

net upward force is larger at the bottom


2014-10-05T08:51:55.478+05:30

TPC-Tonnage Per Centimeter immersion

This is the mass that must be added or

removed from a ship in order to change the ship draught by a value of ONE

centimeter.

>TPC varies with the draught and water

density.
>TPC will help us to know

the draught at different loads

Tonnage Per Centimeter

(TPC) = (A) x (d) /100


2014-08-14T09:30:08.690+05:30

Various Rudder Inspections And Tests Carried Out In Dry Dock

Rudder Inspections And Test Carried Out In Dry Dock
Visual inspection of rudder plating for cracks.Air plugs and drain plugs are opened in front of the

class surveyor. when water drains out it indicates crack in the rudder.So crack is detected by air

pressure and applying soap solution.Check for rudder drop using trammel

gauge.Check for jumping clearance, palm coupling bolt tightness and pintle

clearance.

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Vineeth Mhttps://plus.google.com/1120933646625930701900

2014-10-05T08:49:28.029+05:30

Why Concentric Springs Are Fitted For Auxiliary Engine Head?

Concentric springs are helps to open and close the suction and exhaust valve

Following are the reasons for Concentric springs in the exhaust and suction valves
If one spring fails valve will be held up by the other spring.The thickness of springs can be

reduced.Reduce the space required for one large spring.When frequency due to natural vibration of spring is

in harmonic with cam shaft speed, then spring may vibrate axially and surge. This can be


2014-08-14T11:35:59.381+05:30

Lube Oil Tests On Ships

1.TEST FOR DETERMINING FLASH POINT ( PENSKY MARTIN

APPARATUS)
A potion of lub oil sample is slowly

heated at a constant rate, continue stiring.A small flame is directed through a

open shutter at regular temp interval.Now the temp above which the

vapor ignites gives the flash point temp.For new oil its 220'c, if it get

reduced indicate fuel oil contamination.


2014-06-13T10:18:06.196+05:30

Pump Shaft Alignment Method And Procedure

>>> Straight edge and filler gauge

method
Check gap at 12 &6 oclock

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position.Check straight edge at

top.Use shims to adjust the motor height & gap at

12 & 6 oclock position.Then check straight

edge and gap at 3 & 9 oclock position.Use the

motor jack to adjust it.


2014-04-27T01:48:16.007+05:30

Muff Coupling Explained

This coupling

consists of two sleeves one inner and one outer sleeve.The inner sleeve has a bore diameter slightly more

than shaft diameter surface of inner sleeve is tapered and this tapper is matched on the bore of the outer

sleeve.Nut and sealing ring is used to close the annular space at the end of outer

sleeve.


2014-04-21T14:21:57.082+05:30

How to use hydraulic jack in tie rod

The tie rod is put

into position and nut is screwed up hand tight.A sleeve or collar is then placed around the nut.Hydraulic jack is screwed onto thethread above the nut and collar until it sits just above the collar. (If screw the jack tight onto the collar then

it will be impossible to unscrew the jack after tightening).When hydraulic pressure is applied to the jack it pulls the stud

up and pushes the collar down onto the engine. The entire length of tie rod is

stretched.


2014-04-12T19:45:02.559+05:30

Lube oil Properties of main engine crankcase/cylinder,auxiliry engine,aircompressor,refrigeration

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Main Engine Crankcase

oil Propertylow TBNgood

detergencygood thermal and oxidation

steabilitygood water separable

property

Manojhttp://www.blogger.com/profile/097652285778188679150

2014-04-12T17:46:30.170+05:30

Load Lines on Ship

The load lines and

deck line must be painted in white or yellow on a dark background or black on a light background. All lines

are 25 mm thick. Their upper edges mark the level at which they refer.

Manojhttp://www.blogger.com/profile/097652285778188679150

2014-04-02T17:01:47.946+05:30

SOPEP - Ship Oil Pollution Emergency Plan and List of Equipment Requirement.

What is

Shipboard Oil Pollution Emergency Plan (SOPEP) In Marine Ship.
>It isan emergency plan to be followed at the time of oil pollusion
>MARPOL 73/78

Annex 1 Regulation 37 Every ship of 400tons gross tonnage and above and every oil tanker of 150 ton

gross tonnage and above shall carry on board a Shipboard oil Pollution Emergency Plan approved by the

administration.
>The purpose of SOPEP is to provide guidance on the steps to be taken in the

event of oil pollution incident.


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