AUTOMATIC VOLTAGE REGULATOR
Sudden load current surges (eg. Due to motor starting) on a generator causes a
corresponding change in its output voltage. This is due to an internal voltage drop in
the generator winding and effect is called...
RUDDER ANGLE INDICATOR
It is a device which is used to indicate the current position of the rudder blade, normally fitted in the wheelhouse, bridge wings and engine control room.
A rudder angle indicator consists of a feedback...
EMERGENCY GENERATOR
SOLAS Requirements
Emergency generator and ESB should be located above the uppermost continuous deck, not forward of collision of bulkhead.MSB or any machinery space should not interface with the supply control and distribution of emergency...
BRUSHLESS ALTERNATOR
In
this machine slip-rings
and brushes are eliminated and excitation is provided not by conventional direct
current exciter but by a
small alternator.
The a.c. exciter has the unusual arrangement of 3phase output windings on the rotor and magnetic...
SHAFT EARTHING
When steel is immersed in sea water (e.g. a ships hull) small galvanic current are initiated at anodic areas of the metal surface, causing corrosion.
Such corrosion prevail at the stern of a ship, where...
MAIN SWITCH BOARD
Survey of MSB
Proper cleaning to be
carried internally as well as externally normally carried out when board is
completely dead (all generator stopped and prime mover locked off). Inspect for
dirt and dust (electro clean and vacuum...
MARINE DIESEL ENGINES NOTATIONS
There has been too much puzzle
with regards to the notations used for the Marine Diesel Engines. One can
consult the engine manual & find out what such notations means.
However, this article will
provide explanation for...
LATEST SOLAS & MARPOL AMENDMENTS
MARPOL
1) 1st March 2018 – Data collection system for fuel oil consumption on ships.
IMO documents : MARPOL Annnex 6, regulation 22, 5000GT & above.
Entry in to force(EIF) under tacit acceptance procedure : 1st March...
MOTOR STARTING METHOD
Star Delta Starter
This
is means of reducing
starting current of induction motor by initially connecting to the stator winding to ‘STAR’.
Once
the motor comes up to
speed (68%) to be connected
in DELTA.
When
motor start in ‘STAR’
it has the effect
of:
Reducing...
SHORE ELECTRICAL SUPPLY
A shore supply is required so that the ships generators and their prime movers can be shut down for major overhaul during a dry dock period.
Requirements/Checks
There must be a suitable connection box conveniently located...