Harsha Marine Designers

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RT SSI Challenge Two: Synchronizing Platforms & Systems. Read more here: http://bit.ly/2p5IuLg

Shipyard Business Process Assessment Last week I was at one of SSI’s key clients leading a Business Process Assessment (BPA). I have to admit that I really enjoy these BPA processes because it involves virtually every department in th...

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We are there in Mumbai next week from 23rd Sep to 25th Sep, 2015 for INMEX exhibition. Our Stall no is J 18. People interested can meet us during the show.

Harsha Marine Designers Projects For Mechanical and Marine Students

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Spectacular Ship Collision: 'Grand Rodosi' Crushes 'Apollo S' Like A Can October 8, 2010: CCTV footage shows the huge bulk carrier, Grand Rodosi spearing headlong into the side of the tuna boat, Apollo S whilst moored at the wharf...

https://www.youtube.com/watch?v=twnW3RTnt7o&feature=player_embedded

The accident or crash of two big ship inside the sea The accident or crash of two big ship inside the sea

How Variable Geometry Turbocharger for Marine Engines Works?
In order to draw the highest efficiency from marine engines, they must be run at the highest rated RPM. However, with several norms, traffic rules, fuel efficiency factor etc., marine engines cannot always be operated at high speed.
As the RPM of the engine reduces, the air supply from the turbocharger also reduces, starving the combustion space of air and resulting in improper combustion and increased fuel consumption. To counter this problem, auxiliary blowers are fitted. These blowers come into action at particular low loads.
Variable Geometry Turbocharger or Variable Turbine Angle (VTA) Turbocharger is the solution for supplying sufficient scavenge air to marine engine’s cylinder at all load ranges. Let’s find out what is VTA and how does it works.
What is Variable Geometry Turbocharger or VTA?
A VGT or VTA is a turbocharger, wherein movable vanes are replaced for conventional fixed vanes, which can change angles to control the exhaust flow on the turbine blades. This helps the engine control to balance the volume of air with the fuel along the entire engine load range.

Working of VTA
The VGT or VTA consists of nozzle rings equipped with adjustable angle changing vanes.
Each vane is connected to control a ring using a lever, which reduces the thermal hysteresis and increases the positional accuracy.
The vane position or the angle is adjusted by the control ring connected to the electric positional motor via reduction gear.
The control system governs the action of the microprocessor controlled positional motor. The position or angle of vanes is thus altered after comparing the feedback signals of – air pressure after the blower, and exhaust gas temperature before and after the turbocharger.

Advantages of VTA
Works on the entire load range of the engine
Eliminates the need of auxiliary blower
Reduces the fuel consumption
Reduces exhaust smoke emission and hence air pollution
Lower’s CO2 , Nox, and Sox emission
Reduces soot and carbon deposits on combustion and exhaust space
Reduces fouling of engine parts
Improves efficiency of the engine
Economical in operation

What Are Anti Pollution Vessels?
Anti-pollution vessel is a special type of ship which is employed to absorb pollutants from oceanic water during ship accidents or any other incident which has lead to pollution at the sea. The pollutants can include oil spill because of an accident, garbage left behind by vessels, or other kind of floating marine debris resulting from ocean dumping.
Anti-sea pollution ships are designed to carry-out complete 360 ͦ pollution combating operations at the sea. In today’s times, on account of extensive oceanic contamination and pollution even at the coastlines, the need, importance and presence of such vessels has increased manifold.
These anti-pollution ships are equipped with gadgetries and systems which help in recovering back the polluting substances from the sea water. Some of the main equipment includes pumpers, liquid disinfectant substances, oil spill kits, oil booms, and oil dispersants which can be sprayed to clean up the contaminated areas. Alongside to facilitate the process of cleaning contaminated shore areas and remove debris from the sea, there are specific container systems provided which act like bins.
There are various marine companies that specifically focus on providing such anti-pollution vessels to the required oceanic areas. While most of such companies have come up with their anti-pollution ships’ innovation to be used in any oceanic domain or shore, there are also certain companies that have designed their vessels to cater to only a specific location in a particular nation. Anti pollution ships thus help ships involved in an accident to fight oils spill at the sea.
Sepor s.p.A is a company has two such anti-oil pollution ships – the Optimist and the Acqua Azzurra. Both these vessels have been engaged in many de-contaminating operations of the oceans and bear the hallmark of the four decades of the company’s expertise in designing such unique technological systems. Both vessels offer speeds of about 10 knots and while the Optimist is slightly smaller as compared to the Azzurra, its services are par excellent, nonetheless. These vessels help in cleaning oil spill or other form of marine pollution a variety of ways.
In contrast, the Japanese came with the prospect of building an anti-pollution vessel for two of its major water bodies that are sources of vital marine products and commodities for the people. Accordingly, the vessel KAIKI was built, which not only ensures appropriate cleaning operations from time-to-time, but also doubles as an observation vessel. Constructed at the Mitsubishi shipbuilding yard, the vessel is built using alloys of aluminium and is equipped with several state-of-the-art gadgets to help fulfil its observation studies better.
Anti-sea pollution ships and anti-oil pollution ships are the 11th hour measures developed in order to combat the now-visible threats of marine pollution and minimize the effects of marine pollution. Though these vessels cater extensively to the maritime community, there cannot be any denying that the callousness of the marine operators has been instrumental in their creation, in the first place.

The Biggest Nuclear Submarine in the World – Typhoon Class Submarines
The whole concept of submersibles revolves around concealing naval attacks while trying to dismantle the opposition’s forces. Maritime history charts several unique submarine vessels that have played important parts in shaping today’s present – both positively as well as negatively. The Typhoon Class submarine merits an honorary mention, in this context.
Russian Submarines
One of the last remaining vestiges of the former Soviet Union, they are the biggest submarines ever designed and built. Though referred to as Typhoon in English, they are known as Akula (shark) in native Russian. Built in the Severodvinsk shipbuilding yard in the 80s, the biggest submarine is known for its complete stealth and soundlessness while moving under water.
At first, this appears to be quite contradictory with the hugeness of the vessel. But in fact it is this aspect that makes the largest submarine so important in contemporary parlance. The Russian submarines were well advanced for their time and intended to be the absolute retaliatory vessels especially in the Northern oceanic areas prone to sub-zero temperatures. The submarines could attack any approaching vessel under the cover of the ice without having to worry about damages to their torso or to the naval crew inhabiting it.
However the most important feature of the submarines was the sturdiness of the vessel’s hull. The submarines’ hulls were multiply covered in order to enable feasibility for longer underwater sustenance and to provide for the crew’s basic comforts. As compared to the then-conventional submarine designing of narrower-heads, the Russian submarines were broader which added to their overall subtle movements while on water. At the time of their construction, the submarines were intended to be the Soviet answer to the United States’ Ohio Class submersibles.
Submarine Details and Specifications
- Equipped with ballistic projectiles, the six submarines were propelled through two nuclear reactors, generating almost 200 megawatts (MW) of power each
- The maximum displacement offered by each of the six nuclear submarine is around 48,000 tonnes
- The submarines measured 175 metres lengthwise, 23 metres breadth wise with a draft of 12 metres and at speeds ranging up to 27 knots
- Up to 160 people could be housed within a Typhoon Class submarine during its active operational duty extending up to three-to-five months

Different Types of Submarines and Underwater Vessels