High Voltage System On Ship | Safeties | Advantage | Disadavantage

               In marine field, above 1000V (>1000V) is considered as high voltage (HV) and below or equal to which is low voltage(LV). High voltage system are normally used where there is a high electrical power demand such as electric propulsion, bow thrusters etc . Benefits of this system is related to Ohms law, for a given power, current gets reduced as the voltage is increased. 

Piston In Marine Diesel Engines:Types, Material, Diagram,Crosshead and Trunk piston engines

                    Pistons are key components of marine engines. It work by transferring the force output of expanding gas in the cylinder to a crankshaft. Pistons are directly exposed to heat and gas load, so the material of the piston is not only thick enough to bear the mechanical load but also thin enough to minimize the thermal stress.

Holding Down Bolts And Chocks In Marine Engines

Holding Down Bolts And Chocks In Marine Engines
         Marine Engine is a massive structure so its very important to securely fix the engine into the ship hull. The floor where main engine is situated is strengthened by additional bars and griders. The bedplate which is the base of the engine is attached to the tanktop by holding down bolts and chocks. 

Actual Valve Timing Diagrams of 2 Stroke And 4 Stroke Marine Diesel Engines

Valve Timing Diagram
  Valve timing diagram is the graphical representation of opening and closing of inlet and exhaust valve according to the piston movement in two stroke and four stroke engines. It shows the crank angle of exhaust valve opening, exhaust valve closing, Inlet valve opening, inlet valve closing, fuel injection starts and fuel injection ends in a full cycle of the operation

Actual PV Diagrams Of 4 stroke And 2 stroke Marine Diesel Engines

              The pressure-volume (PV) diagram is drawn by measuring the pressure inside the cylinder, and plotting its value against the angle of the crankshaft,over a complete engine cycle 

Types Of Turbocharging In Marine Engines | Constant Pressure Type and Pulse Type Turbocharging

There are two types of turbocharging Constant pressure type and Pulse type turbocharging

Types Of Turbochargers In Marine Diesel Engines | Axial Flow And Radial Flow TurboChargers

Types Of Turbochargers In Marine Diesel Engines
         Based on the exhaust gas flow, there are two type of turbochargers: Axial- flow turbo chargers and Radial turbo chargers.

Why Pulse Type Turbochargers Are Used in Auxiliary Engine Not In Main Engine

  Why Pulse Type Turbocharging is Used in Auxiliary Engine
> As you know that pulse type turbochargers are required high velocity pressure pulse waves to rotate the turbine. In Auxiliary Engines exhaust valves rapidly open, exhaust gas leaves the cylinder at a higher velocity in small piping. which hits the turbine blades and make it rotate. So pulse type turbocharger is suitable for auxiliary engines

All About Collision Bulkhead, Purpose, SOLAS Regulations and Its Position

What is collision Bulkhead?
> Collision Bulkhead is a  heavy duty water tight bulkhead in the forepart of the vessel to withstand damage after impact from collision. 
> It is the foremost major watertight bulkhead, which extends from bottom to main deck(upper deck). 
> It is at a distance of L/20  from forward perpendicular.

SOLAS Life Raft Requirements And Safeties

General Life Raft Requirements 

> Designed in a way that it should afloat 30 Days in any sea conditions.
> Construction of the life raft and its fittings must withstand towing at a speed of 3 knots in calm water with full loading by people and equipment and with one of its sea anchors.