Posted March 15th, 2013, 06:35 AM
The diesel generators that supply power to the ships are made by some one other then the yard building the ship. A builder, in this case Carnival can specify any diesel generator that they want.
Carnival has also used Kaverner Masa yards in Helsinki for several ships.
From the little I could find, the Wartsila is probably the mains and back ups. The difference being the number of cylinders. Typically the mains are 16 cylinders and the back ups are 10 or 12 depending on the size of the ship.
Going back to the next part of the question, I dont think that anything could be done differently in regards to the engines/generators themselves.
In 2 cases, fire was the main culprit taking out the electrical distribution system. In that case, it doesnt matter how big or how many back ups you have if you cant get the power from them, into the ship.
In the case of the Dream, there was an issue that was found with the back up,during a regularly scheduled inspection. It wasnt a surprise that the mains died, and the back up didnt start. There was never a main power issue other then maybe the back up throwing the main breakers because it was doing something its not supposed to do. (which explains the intermittent power issue reports)From what I am gathering, there is at least 1 if not more then 1 entity that is saying without a working back up, you can not leave port. Whether its St Maarten, IMO, CCL, the insurance underwriter or any other major players I dont know.
Actually, the manufacturer of the main generator and the emergency generator are frequently different. This is due to the fact that the main generators are what is called "medium speed" engines, and the emergencies are more commonly "high speed" engines. Many engine manufacturers specialize in one type. I have seen MAN main engines on ships with Caterpillar emergency engines.
From my reading of the reports, it sounds like the fault was found when the crew was performing a required monthly test of placing the emergency generator on-line (actually powering the emergency bus) for a two hour period. This is normally done midday, when pax count onboard is minimal, as there is a short period when only the emergency circuits are lost during transfer. If there was a mechanical problem with the generator or engine, there would not have been intermittent power interruptions during the night. This was most likely caused by the crew testing the circuits that control the "bus tie" circuit breakers that connect the main power bus with the emergency bus. I believe this is where the fault lies, but again, even with an emergency generator engine that runs, but cannot be connected to the power bus, that is an inop emergency generator, and is a "no sail item".
And you are entirely correct that there is no correlation between the Splendor, Triumph
, and now the Legend with a pod problem, from a manufacturer's or builders perspective. If as you say, the maintenance is not being accomplished, while records are showing it as being completed, that is an entirely different thing.
Some have questioned why Carnival continues to use the same design for many ships, just adding decks of cabins to the same basic hull design they have used for years. These designs met the design requirements of all regulatory agencies AT THE TIME they were built. Now regulations have changed, and all new ships must meet more stringent regulations. Carnival is not alone in this practice.