Compressed air system for auxiliary engines on board performs some critical functions -starting,stopping & pneumatic controls Figure 1. Starting & Control Air System NC (Normally Closed) valve will remain closed when not activated,as shown.However,whenever activated or energized the valve spool will be pushed against the spring in the direction of the arrow and open. NO […]
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Air Conditioning System on board Figure 1. Air Handling Unit The figure above represents a typical AHU( Air Handling Unit). It’s generally located at accommodation area,a bit away from the compressor unit.As shown in the figure it’s divided into a number of sections. The air draft enters through mixing section & exists through distribution section.
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The figure below represents a typical automatic water level control system for boilers. Fig.1 Automatic water level control system Feed water pump draws feed water from Feed water tank and delivers through the Automatic feed water regulating valve(B) to the boiler. Level transmitter(A) continuously monitors water level in the boiler & sends feedback to the
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Emergency trips are vital for safeguarding the engine in fault or abnormal running conditions & are the last line of defense. Emergency trip/shutdown will be triggered for following cases: There are two independent speed measuring sensors(pick-ups).One for the Control system & the other for the Safety system.If both of them fail,engine will trip. How Emergency Shutdown
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The following lists represent the most common alarms & trip functions incorporated with Aux. Boiler control system.However,these might vary to some extent based on the specific requirements of the Classification society and at the discretion of the maker. Alarms without trip function Alarms with simultaneous burner trip function
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A rotary cup burner utilizes centrifugal force for atomization & propagation of fuel oil inside the furnace.This system is having : Figure 1 – Rotary Cup Burner Primary/Ignition burner The Ignition burner,as its name implies initiates the ignition and needs an external source for the purpose.Two high voltage electrodes with precise gap in between,are fitted
CO2 Total Flooding System Fixed fire extinguishers on board are installed to fight large fires that require complete evacuation of the area engulfed by the fire. CO2 total flooding system is predominantly installed on board cargo vessels to deal with large fires in Engine room as well as in Cargo holds. Advantages of using CO2
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Works on the principle of vapour compression refrigeration system Refrigerant & Temperature Settings Refrigerant(typically used on board contemporary vessels): R 407C Set temperatures for cold rooms (Meat room & Fish room): -18 C Set temperature for chilled room (Vegetables room): 4 C Working Principle & System Components The provision refrigeration plant on board works on
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Cavitation & NPSH are widely talked about terms associated with centrifugal pumps Cavitation & NPSH these two terms are closely interrelated. NPSH is the cause & Cavitation is the effect. NPSH NPSH stands for Net Positive Suction Head. To put it simply – it is the resultant pressure energy or head available at the pump’s
Water carry-over is the most significant factor for cylinder liner wear & cold corrosion Combustion air (Scavenge air,Charge air) drawn in from the surrounding by the Turbocharger passes through the Air Cooler for cooling down.This cooling down increases density as well as mass of the air supplied to the engine cylinders and ensures that there
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