Air Compressor

<a An air compressor is a device used to compress atmospheric air taken in through inlet valves and compressed to a high pressure, the compressed air being used for various purposes such as cleaning, spray painting, pneumatic operations, starting the main engine, etc. Air compressors force air into a tank, increasing its pressure. When the…

Sonar

<!– wp:paragraph Sonar or Sound Navigation Ranging is a technology which involves the use of sound to detect vessels and other objects underwater or on the surface to aid navigation and avoid collisions. Sonar are of two types: active sonar and passive sonar. Active sonar emits pulses of sounds and listen to echoes from other…

Incineration

Incineration is a waste treatment process that involves the burning of solid waste in an incinerator. The burning process produces ash, heat and flue gases. Incinerators are very effective in reducing the volume of waste used for landfills and very popular in countries where land is scarce. The waste is usually compressed before being delivered…

Refrigeration

Refrigeration is defined as the science of providing and maintaining temperature below that of atmospheric temperature. It means continuous extraction of heat from a body which is already below atmospheric temperature. Refrigeration involves cooling a space, substance or system to lower its temperature or maintain that temperature below its ambient temperature. Energy in the form…

Stern Tubes

<a The stern tube is a hollow tube located at the lower stern part of the ship carrying the tail shaft and connecting it to the propeller,bearing for the tail shaft, lubrication arrangement and sealing arrangement. The propeller shaft or tail shaft is supported in a stern tube bearing. The bearing being at the end…

Deep Submergence Rescue Vehicles

<a A Deep Submergence Rescue Vehicle or DSRV is a marine vessel used for rescuing crew from downed submarines and other clandestine missions. These are specialized vessels that require highly skilled professionals to operate these vessels and successfully carry out complex rescue missions. There are a number of countries that operate DSRVs with different designations…

Heat Exchangers

Heat exchangers are devices used to transfer heat between two or more fluids. They are used for both heating and cooling processes. The fluids may be separated by a solid wall to prevent mixing or may be in direct contact. They are widely used in refrigeration, chemical/ petrochemical processing plants, power stations, refineries and sewage…

Electric Ferry begins operations.

An electric ferry developed in Denmark has began commercial operations. Named the ‘ Ellen’, the ferry which is said to be the world’s largest ferry completed it’s maiden journey in August 2019. The ferry is powered entirely by lithium ion batteries and has been praised by passengers and crew as far less polluting to the…

Propeller and Rudder.

A propeller is a device with a rotating hub and radiating blades made of bronze and brass. It transforms rotary power into linear thrust by acting on a working fluid like water or air thus moving a ship forward. The rotational motion of the blades is converted to thrust by creating a pressure difference between…

Purifiers and Clarifiers.

These are two centrifuges used onboard ships to separate two liquids with different densities from one another in the case of purifiers or to separate impurities from water in the case of clarifiers. Operations. They contain discs stacked up together numbering 150, separated from each other by a very small gap. A series of holes…