MLC 2006

 Marine labour convention

• Minimum age to work in onboard- sixteen(16), under eighteen (18) will not allow to work on night watch
• Safe employment agreement
• Rest hours
• Payment of wages
• Paid anual leave
• Repatriation at end of the contract
• Onboard medical care 
• Proper accommodation and food
• Health and safety protection.

Rest hours

Minimum rest hours not exceed than

 14 hours in any 24 hours

 72 hours in any 7 days 

Maximum rest hours shall not less than

10 hours in any 24 hours 

77 hours in any 7 days 

HOW WILL YOU TEST THE CRANK CASE RELIEF VALVE

TESTING OF CRANK CASE RELIEF VALVE

• After engine is stopped,
• Remove the flame trap after that  press up the valve disc and check the the action of opening and closing movement
• the valve should be opened smartly, and closed positively and rapidly.
• the valve must be oil and gas tight
• when engine is running we must only check the oil leakage it will indicate the valve is sealed or not.

FREE SURFACE EFFECT

 FREE SURFACE EFFECT

Definition of free surface effect?

    When a tank or compartment partially filled with liquid, when a ship is inclined. liquid will moves along with ship's inclined  direction. which will reduce the stability of the ship.

How to reduce free surface effect:

• Swash bulkheads 
• Pocketing
• Surface permeability
• Sluice valves 

Swash bulkheads

This types of bulkheads give some additional strength, Which are longitudinal  bulkheads which will restrict the flow of liquid when ship is  inclined  

Pocketing

 fill the tank fully which will reduce the free surface effect

Surface permeability

The object such as machineries, engine and piping systems prevent the moving water  shifting of wedge, these reducing the free surface effect.

Sluice valves

 The large slack tanks are cross connected with sluice valves, it will reduce  the flow of the liquid so that it will reduce free surface effect.

ISPS CODE : SOLAS CHAPTER 11.2 SAFETY MEASURE ENHANCE TO MARITIME SECURITY

 Safety measures enhance to maritime security
ISPS code

Objectives of Ism code:

•  To discover the security threats and take preventive action against the security threats.
• And proper preventive measures are placed 
• Early and efficiently collecting the security level information, and share  the security information.

Three levels of ism code 

Level 1:

•  Minimum appropriate preventive security measures for all the time.

Level 2:

•  Additional protective preventive security measures for period of time.

Level 3:

•   Level 3 is High level protective preventive security measures for limited time.

Level 1:

•  Deck over lightings.
• Crew photo identification 
• Visitors should be identified
• Regular patrolling will carried out.
• rooms which is not in use should be closed and locked by key.
• Certain area should be closed and locked by key

Level 2 

•  In additional to level 1
• Oscillation search will carried out.
• Shore Delivery should be checked properly.
• Visitors will strictly assist.
• Cargo seals should be checked.
• Visitors are restricted to ecr and bridge.
• All crews aware of bomb alert

Level 3:

•  In additional to level 1 and level 2
• Gangway should be lifted.
• Cargo operations can stop with special permission.
• Tight patrolling will carried out.
• Very high level security.
• Crews aware of situation.

AIR COMPRESSORS (why single stage compression is not in use)

Why single stage compression is not in use?

For high pressure reciprocating air compressors are used. Even in reciprocating compressors, a compression ratio of 1:7 is common (more than this the air is getting compressed becomes very hot and will reduce the overall efficiency). Hence, compression is done in a two stage with inter/after cooling arrangements. 

AIR COMPRESSORS

 Uses of Compressed air onboard ships

• For automation and control of main and auxiliary machinery and equipment.
• For starting of Main engines, auxiliary engines, emergency generator engine etc.,
• For pressurizing the hydrophores for domestic fresh water and sanitary water used in accommodation.
• For use in sewage plant for conducting aerobic sewage breakdowns.
• For soot blowing of the boilers.
• For use in fog horns and ships whistles.
• For heaving the life boat up by the use of an air motor.
• Used in pneumatic pumps for oil transfer and pneumatically driven hand tools such as grinder/ chisels/ drills/ spanners/ jacks/ etc.,
• For use as general service air for use in general cleaning & painting operations.

Generally two pressures of air are used: 

1. High pressure air - 30 bar (Used for starting the main/auxiliary engines)
2. Low pressure air - 7 bar (Used for control and service air)