Marine

The power output of an internal combustion engine is a crucial factor in determining its performance. Two of the most commonly used methods for measuring this power output are indicated power and brake horsepower. First of all, when we say indicated power it is the total power produced within the cylinder in one complete cycle without considering any losses, and on the other hand, the amount of power available at the dynamometer is called brake power. Let’s take a closer look at the difference between indicated and braking power. Brake power is usually less than indicated power. The difference between indicated and brake power is called friction power. The primary goal of Internal combustion engine design and development is to lower production costs while increasing effici...

The bulbous bow is a game-changing innovation in modern ship design, enhancing both performance and efficiency. Dive into the fascinating world of the bulbous bow, an ingenious innovation that has transformed modern ship design. Explore its hydrodynamic secrets, discover its myriad benefits, and unveil its real-world applications. This article will explore the intricacies of this fascinating feature, delving into its design, benefits, and real-life applications. Are you ready to embark on this captivating voyage? Understanding the Bulbous Bow A bulbous bow is a protruding bulb at the front of a ship’s hull. Unlike a traditional bow, it extends underwater, disrupting the water flow around the vessel. First introduced in the 20th century, this innovative design reduce...

Sewage is a very smelly topic if left undiscussed. This article will help you understand how the maritime industry handles human waste aboard the ship without violating or harassing the environment. Sewage Treatment Plant on Ships How does a sewage treatment plant work on ships? The sewage treatment plant on the ship begins by collecting and segregating the wastewater from each cabin space. There are two types of wastewater being treated aboard; Grey and Black water. On board, the grey water has a separate piping arrangement from the black water. The grey water goes to the grey water holding tank while the black water goes to the black water holding tank. Both are processed by the sewage treatment plant before pumping out to the sea. At the port, sewage cannot be pumped out...

Main components of the vacuum sewage treatment plant on board ship are ejector (for creating vacuum in toilets), pressure switch (to maintain vacuum in the system) and level switch for the operation of treated effluent discharge pump. Working and maintenance of air ejector, pressure switch and level switch are explained below. Operation of Air Ejector The air ejector consists of a jet tube of stainless steel, a check valve and a nozzle of PVC. The driving water for the ejector is supplied from the collecting tank with the help of a pump and the discharge is fed back to the tank. Sewage is pumped from the tank through the nozzle of the ejector creating a venturi effect whereby air and waste are inducted from the toilet piping, mixed with the sewage jet and passed i...

What are the advantages and disadvantages of both electrical and pneumatic control systems on ships ? Electrical Control System Advantages No air compressor and associated machinery required. High efficiency since there is no leakages. Instantaneous response. Very little affected by normal temperature variations. Very accurate. Electric cables are cheap and easy to lay. Disadvantages The system require uninterrupted power supply with no voltage fluctuations. Standby batteries required in case of power failure. There is risk of fire due to overheating. Expensive intrinsically safe / explosion proof equipment may be required. Moisture may cause damage to the system. Damage readily occurs in the event of a fire. Pneumatic Control Syst...

What is meant by Eductor ? Eductor is a simple type of pump which works on the ‘venturi effect’ to pump out air, gas or liquid from a specified area. Eductor require only a motive fluid or driving fluid for its operation, which allows it to use at any part of the ship including hazardous areas. When the driving fluid is passed through the eductor at the required capacity (which depends on the design of the eductor), a low pressure is created inside it. This low pressure or vacuum enables the eductor to suck liquid or gas from a certain area. This liquid or gas is pumped out through the driving fluid discharge. Working Principle of Eductor on Ships Eductor works on Bernoulli’s principle. It states that an increase in the speed of a fluid occurs simultaneously with a reduc...

What is governor ? Governor is a device which controls the speed of engine automatically in the prescribed limits. The governor does its job in two steps. By measuring the speed and By controlling the a amount of fuel supply to the engine. What is the function of governors ? To adjust the rate of fuel supply in such a way as to keep the engine running at a steady speed regardless of the load. To control the engine running at a steady speed under all conditions of load. What is governor droop? When considering the engine and governor combination, the difference between the no load speed and full load speed is called governor droop. Small droop results in rapid swing. Large drop results in slower response to change in s...