This category contains Marine Technical Articles

Mechanical/Hydraulic Governors -Why fly weights are driven at a higher rotational speed than the engine?

Why fly weights are driven at a higher rotational speed than the engine? * Fly weight equipped governors work on centrifugal force. The centrifugal force acts upwards and the spring force acts downwards. * This difference between the spring and the fly weights is called the governor effect, which is responsible for moving the pilot…

watertightness of watertight bulkhead

How watertightness of watertight bulkhead maintained where bulkheads are pierced by longitudinal beams or pipes

How watertightness of watertight bulkhead maintained where bulkheads are pierced by longitudinal beams or pipes. The watertight bulkheads are provided in the ship for the following purposes; Strength: provide major resistance to hogging, sagging, racking, water pressure etc. Separation – segregates incompatible cargoes and dissimilar compartments. Safety (fire) – provide main vertical zones for the…

Preferential tripping in a marine electrical distribution system

Preferential tripping in a marine electrical distribution system

Preferential tripping in a marine electrical distribution system Preferential tripping in a marine electrical distribution system are designed to disconnect non-essential circuits (e.g. breakers controlling air conditioning, galley power, blowers, refrigeration etc.) in the event of partial overload or partial failure of the supply, with the aim of preventing operation of the main breaker trip and…

Vacuum Sewage System

Vacuum Sewage System General Description The system uses vacuum to transport sewage from toilets and urinals (Collected in a local tank behind the urinal and activated by a float as the level rises) to collecting units. There is a vacuum only ion the piping network and collecting units (Toilets, urinals etc.) remain under atmospheric pressure…

Various statutory Certificates and Documents to be carried on board ships

LIST OF VARIOUS STATUTORY CERTIFICATES & DOCUMENTS TO BE CARRIED ON BOARD SHIPS. CERTIFICATES TO BE CARRIED VALIDITY OF CERTIFICATES CONVENTION SURVEY ISSUANCE Cargo Ships Foreign going (all in original) International Tonnage Certificate (1969) Valid for lifetime unless major change in construction. International Tonnage Convention 1969 Surveyed by Class, measurements are taken, computed. Issued by…