I believe that many of you have heard about PID, Temperature Control Valve (TCV), valve controller, step up controller etc. onboard vessel during your career. I know from my experience that many of the young engineers encounter problems to understand what exactly are those machinery items and how did they work. So, in this post…
Many of you might have worked on vessel equipped with Hyundai HAT series Air Circuit Breakers which proves to be very reliable and efficient but…like any other machineries it requires periodical checks and maintenance. If this is not properly done the result it might be a failing UVT coil or breaker fail to close when…
Either directly, through the piezoelectric effect, or indirectly, through the measurement of elongation, forces and pressures can be determined. Since elongation measurement is only possible for alternating quantities, it is only utilized for the monitoring of vibrations. Hook’s Law of material elongation and an equation regarding the dependence of the resistance of a straight conductor…
On automated ships, a wide variety of sensors, actuators, controllers and controls, indicators, and alarms are supplied for use in monitoring and operating the engine system. Electrical signals are used to convey the values that have been measured so that they can be shown in a location that is physically separated from the point of…
Many of you might have worked on vessel equipped with Hyundai HAT series Air Circuit Breakers which proves to be very reliable and efficient but…like any other machineries it requires periodical checks and maintenance. If this is not properly done the result it might be a failing UVT coil or breaker fail to close when…
I believe that many of you have attended, at least once in your career, a Dry Dock period and noticed that during this time, because of the amount of planned maintenance to the vessel machineries, it is necessary for the vessel to be connected to the yard power supply. Usually, Chief Engineer together with the…
An insulated system is one that is completely electrically isolated from the earth or in our case the hull of the vessel.The supply neutral point is connected to earth in an earthed system and main low voltage (LV) (440 V AC) systems are generally shielded from the ship’s hull. Ashore, similar systems are earthed to…
Onboard vessels, modern power management systems make it less likely for power to go out for no reason, but engineers must be familiar with the specific procedures, where to find the instructions and procedures, and ready to act in case of automation failure. In case of a problem with power main diesel generators or in…
A turning propeller is electrically insulated from the hull by the lubricating oil film in the bearings. Electrical potential is generated between the shaft and the hull and as a result the cathodic protection of the ship will not protect the propeller. Electrical potential can cause currents in the bearings resulting in pitting of the…
Most of the emergency power requirements are supplied by the emergency 24V system which consists of a battery distribution board backed up by a separate 24V battery. This provides a smooth changeover to a constant power source upon loss of the ship’s main or emergency power. When the emergency source of electrical power is an…