Skip to main content

What is dual class ? Why

A dual class vessel is one which is classed by two Societies between which there is a written agreement regarding sharing of work, reciprocal recognition of surveys carried out by each of the Societies on behalf of the other Society and full exchange of information on the class status and survey reports. 
  • All the ships of "The shipping corportation of India" used to have dual class. 
  • Out of two, one classfication society was "Indian Registrar of shipping". 
  • Indian ships were required to have IRS as its classification society but as IRS was then not a member of IACS, ships were forced to have a second classification society which was member of IACS. 
  • So in this case, these ships would have certificate of class from each classification society. 
  • In 2010 when IRS became the member of IACS, Indian ships were no more required to have Dual class. 
  • More than 50 classification societies. But only 12 are IACS members 
A double classed vessel is one which is classed by two Societies and where each Society works as if it is the only Society classing the ship, and does all surveys in accordance with its own requirements and schedule.

Comments

  1. Dinco TradingDecember 19, 2025 at 8:23 AM

    check this kind of article and I found your article which is related to my interest.steel suppliers in uae Genuinely it is good and instructive information. Thankful to you for sharing an article like this.

    ReplyDelete
  2. DavidJanuary 26, 2026 at 1:39 AM

    Outstanding digital knowledge hub Techslaash consistently shares clear tech updates, gadget trends, and honest reviews that help readers understand technology easily while enjoying a smooth, informative experience designed for beginners and enthusiasts alike in today’s fast moving digital world.

    ReplyDelete
  3. DavidJanuary 26, 2026 at 1:41 AM

    Credible news platform offering Newsdoze delivers real information through clear reporting, consistent updates, and honest perspectives that empower readers to follow current events, understand complex issues, and trust the news they consume without unnecessary noise or sensationalism.

    ReplyDelete
  4. DavidJanuary 26, 2026 at 1:43 AM

    Curiosity drives readers to TechWail, where every emerging tech topic is covered with precision, offering detailed explanations and analysis that both educate and inspire, creating an engaging platform where curiosity meets cutting-edge information seamlessly.

    ReplyDelete

Post a Comment

If you have any doubts.Please let me know

Popular posts from this blog

Main engine interlocks

Interlocks are provided so that the engine can be started or reversed only when certain conditions have been fulfilled. When there is a remote control of engines, it is essential to have interlocks. This reduces the possibility of engine damage and any hazards to the operating personnel. Turning gear Interlock . This device prevents the engine from being started if the Turning gear is engaged. Running Direction Interlock . This prevents the fuel from being supplied if the running direction of the engine does not match the Telegraph. Starting Air Distributor in end position . This prevents starting from taking place if the shifting of the Distributor has not been completed. Main Lube. oil pressure, Piston cooling pressure, Jacket water pressure, and important parameters must be above the required minimum. Auxiliary Blower Interlock . The Auxiliary Blower is provided in case of Constant pressure turbo charging. Air Spring pressure Interlock . In case of the present generation...
8 comments
Read more

Differences between MC/MC-C and ME/ME-C engines

The electrohydraulic control mechanisms of the ME engine replace the following components of the conventional MC engine: Chain drive for camshaft Camshaft with fuel cams, exhaust cams and indicator cams Fuel pump actuating gear, including roller guides and reversing mechanism Conventional fuel pressure booster and VIT system Exhaust valve actuating gear and roller guides Engine driven starting air distributor Electronic governor with actuator Regulating shaft Engine side control console Mechanical cylinder lubricators. The Engine Control System of the ME engine comprises: Control units Hydraulic power supply unit Hydraulic cylinder units, including: Electronically controlled fuel injection, and Electronically controlled exhaust valve activation Electronically controlled starting air valves Electronically controlled auxiliary blowers Integrated electronic governor functions Tacho system Electronically controlled Alpha lubricators
15 comments
Read more

Manganese bronze is not typically used as a propeller material .Why

1. High cost: Manganese bronze is a costly alloy, making it less economical for large propellers. 2. Low strength-to-weight ratio: Compared to other propeller materials like nickel-aluminum bronze or stainless steel, manganese bronze has a lower strength-to-weight ratio. 3. Susceptible to corrosion: Manganese bronze can corrode in seawater, especially when exposed to high velocities and turbulence. 4. Poor cavitation resistance: Manganese bronze is more prone to cavitation damage than other materials. 5. Difficult to cast and machine: Manganese bronze is challenging to cast and machine, making it less desirable for complex propeller geometries. 6. Limited weldability: Manganese bronze has poor weldability, making repairs and modifications difficult. Nickel-aluminum bronze or stainless steel are commonly used for propellers due to their: - High strength and durability - Excellent corrosion resistance - Good cavitation resistance - Ease of casting and machining - Weldability
88 comments
Read more