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International Regulations for Preventing Collisions at Sea

COLREG part 1

COLREG part 2

COLREG Annex

Guidelines

8.1 NAVIGATION

What do you know about interaction? Gave 2 ship models.

Interaction is the reaction of the ship’s hull to pressure exerted on its underwater volume.

Describe the risks if the overtaking vessel is too close?
● The most important one would be a risk of a close quarter’s situation resulting in a collision caused by the interaction of both vesse…[Read more]

What is screw race? Which is more prominent – screw race or transverse thrust?
What is wake current, frictional wake and girthing?

SCREW RACE
When the engines are working ahead, it causes the propeller to drive a spiral flow of water towards the rudder. The spiral flow of water is known as a screw race.
SPIRAL motion of water when propeller b…[Read more]

Maintanence of LSA equipments as a chief officer
III/20 and III/36
Refer excel sheet
How do you carry out maintenance of lifeboat davit?
Msc circular 1205 – for manual (includes list of checks weekly and monthly)
Maintenance of l/b davit (msc 1093)
1) Davit structure – corrosion, misalignment, deformation, excessive freeplay
2) Wires and she…[Read more]

Solas II 2-2/ carriage of dg – DOC
– solas VI/2
General principles of loading docs required
– necessary for proper stowage and safe carriage
Cargo units – special properties of cargo,
Css code 1.9
Prior to shipment the shipper should provide all necessary information about the cargo to
enable the shipowner or ship operator to ensure that:
– t…[Read more]

Purpose: Reduce CO2 emissions.

DNVGL guide

EUMRV: Eu(rope) Monitoring Reporting Verification

Date: 1 Jan 2018

Ships: > 5,000 gross tonnage (GT)

Area: EU, calling any EU ports.

Report details:
– Amount and emission factor for each type of fuel consumed in total
– Total CO2 emitted and additionally differentiated to aggregated CO2 emitted
-…[Read more]

1. Air compressor
2. Air circuit breaker
3. Boiler & gauge glass
4. Boiler ACC
5. Boiler burners
6. Boiler circulating pump
7. Boiler safety valve
8. Bedplate
9. Bilge diagram & screw down valve
10. Centrifugal pump
11. Container midsection
12. Control for jacket cooling & boiler water level
13. Crankcase relief valve
14. Cylinder liner

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Free Surface Effect Of Ships:
When any tank or a compartment is partially filled, the motion of the liquid (due to the ship’s rolling and pitching motions) would reduce the stability of the ship. Why? Because, when the ship is inclined, the liquid in the tank shifts to the lower side of the tank, as shown in the following figure.

Figure 1: F…[Read more]

Daily checks 

• Check the lubrication
• Check the noise level by operating the crane without load
• Check the heat generation
• Check all the limits and trips are working properly
• Check the contact areas of electrical equipment
• Check the brake operation
• Check condition of clamp in the hook

2)PMS 

• Overhauling of motor

…

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Zener Diode
Definition: A heavily doped semiconductor diode which is designed to operate in reverse direction is known as the Zener diode.

Diodes generally are known as a device that allows the flow of current in one direction (forward biased) and offers resistance to the flow of current when used in reverse bias. Zener Diode  on the othe…[Read more]

The Important safety devices fitted on main switch board are:

• Circuit breakers: A circuit breaker is an auto shut down device which activates during an abnormality in the electrical circuit. Especially during overloading or short circuit, the circuit breaker opens the supplied circuit from MSB and thus protects the same. Different circuit b…

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Factors that affect insulation 

1) Moisture

• Leakage current increases

2) Dust, oil, deposits on end of winding and connections

• Cause insulation burn out overtime
• Reduce heat dissipation, dust clog 
• Ventilation duct and restrict free flow of air
• Increase machine temperature and cause thermal degradation on i…

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Ppe 

must be of correct insulating class 

• • 1. electrically insulating safety helmet
    2. insulating rubber gloves

must satisfy international IEC standards, subjected to dielectrical, mechanical resistance and ageing test.to check if easily broken

• • 1. Insulating gloves
    2. Pneumatic glove tester, 

    <…

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1. Air Circuit Breaker (ACB) is used to provide Overcurrent and short-circuit protection. 
2. Air as an arc extinguishing medium.

Air Circuit Breaker Working

1. Air Circuit breakers generally have two pairs of contacts.
2.  The main pair of contacts (1) carries the current at normal load and these contacts are made of copper metal. 

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