Cavitation of a ship's propeller is phenomena that can greatly reduce a ship propelling efficiency whilst at the same time lead to rapid degradation of the propellor.To learn further about cavitation, we need to get familiar or refresh our knowledge regarding Liquid vapour phases.Solid (ice) Liquid (water) Vapour (steam)The phases of liquid and vapour are influenced by temperature and pressure. Water is normally observed to change its state to the form of vapour when its temperature is raised to above 100 deg C at atmospheric pressure. Water can also vaporise when the … [Read more...]
Ship’s Magnetic Compass – Dry and Wet Compass with their care, maintenance and bubble removal
As per Chapter V of SOLAS 74, as amended, a magnetic compass is a compulsory part of the shipborne navigational equipment. This is in addition to the gyro compass & suitably placed repeaters on the ship. This is so primarily because of the reliable dependence one can place on the magnetic compass, as a standby compass in the event of failure of electrical power on board. The regulation also stipulates that the magnetic compass should be properly adjusted and a table or curve of deviations is available on board at all times.Our intention is only to give you a brief description and … [Read more...]