The Pattern 263 Series of Freighters is the result of a cooperation of Silverport Dockyards Limited with Avisronian technology firms, especially Lockwell Defence and the Avisronian Federal Energy Agency. The aim of the Pattern 263 Series was to develop an efficient freighter suited for either Dry Bulk and Liquid Bulk, capable of entering and operating in harbours of less developed nations, either conventionally powered or nuclear-powered.

The Pattern 263 Series is the first class of vessel in SDY's Catalogues, which exceeds the maximum length of 285 metres, which is the length of the main docks in Silverport, thus being constructed abroad: In Avisronia.

The aim was to develop a freighter hull, that can be built for different applications, namely as either a Dry Bulk and Liquid Bulk Vessel, differing in their engine compartments and technical details.

The Pattern 264 Series, following on this project, is the short-hulled version of that concept.

We highly recommend to operate vessels of the Models A and C with nuclear technicians onboard.

Pattern 263 Model A

The Model A is the dry bulk carrying and nuclear-powered origin of the entire Pattern 263 Series, the initial hull to end all hulls. It was constructed as a part of the Pattern 263 Project, but its origins reach back to the days of the Caillte Maritime Solutions Engineering Office of Wembury, which went defunct in 1993, with their documents taken over by SDY as part of the inheritance of Fynn Caillte of the Tribe of Cork.

Like its fellow models, it is a classical monohull design built of steel with a double hull.

The reactor compartments, one on either end of the vessel, is armoured for security reasons, the Pressurized Water Reactors working in their basic principles like any other nuclear reactor, whether they are found on shore or other vessels. Their lifespan before the fuel needs to be changed is estimated to be around 30 years, but regular maintenance is highly recommended. The superstructure sits near the aft.

Due to their gigantic size, the Pattern 263 Model A is limited to deepwater ports or ports with offshore shiploaders, although the lightering of material to and from smaller vessels, like river barges, is a possibility as well.

Such deliveries are supported by a pair of two off-loading cranes, one before the superstructure, the other on the bow. These twenty metre high cranes, with a sixty metre long boom, can reach into every nook and cranny of the cargo holds.

Pattern 263 Model B

Model B is basically the same vessel as Model A, but with one important difference: Instead of being powered by nuclear reactors, the Model B is powered by a diesel generator, which provides less power, less speed and less costs for the owner, being cheaper in upkeep. The Model B's diesel generator is mounted aft, below the superstructure. A heavy two-stroke crosshead Diesel generator provides all the necessary power, providing 30,000 kW of power for all ship operations, from the coffee maker to the single shaft. These engines, when run at their highest speed, consume around 100 tons of heavy fuel oil per day.

Due to the gigantic amount of cargo carried by one Pattern 263, however, the emissions in carbon-dioxide are lower then with a fleet of smaller vessels if calculated in emissions by ton of cargo.

There are a few other, smaller technical differences, like for example the Model B only carrying one crane, the bow crane, but in general, the Models A and B are similar to each other.

Pattern 263 Model C

C's life actually began by accident and by misinterpretation. Upon review of the plans, one of the engineers, originally working on the Pattern 256 Tanker, spoke about the cargo holds being tanks – while the Models A and B can be loaded with liquid bulk, they should not be loaded with liquid bulk.

That is, what the Pattern 263 Models C and D are for. Using that misinterpretation of the engineer as an inspiration, Yard 15 explored the possibility of indeed replacing the cargo holds with tanks, coming up with a design working quite well.

The Model C is the Nuclear-powered variant of the Pattern 263's Liquid Bulk Carriers, with two Lockwell Defense SR7 Nuclear Reactors at either end of the vessel, with twenty tanks having a capacity 500 million litres, or 3.14 million barrels, of either oil or gas.

For loading and offloading, the Model C is equipped with twenty cargo pumps, one for each tank, which can be connected to marine loading arms for loading and offloading. Due to security reasons, the Model C is equipped with an inert gas system, which ensures, that the gas or oil onboard does not ignite by accident (which would be very, very bad), as well as tank cleaning system for each tank.

Pattern 263 Model D

Model D is the Diesel-powered Pattern 263 Liquid Bulk Carrier, basically the same vessel as Model C with a diesel generator. With less power, less speed and less operating costs, the Model D has its reason for existence.

The Model D is equipped similarly to the Model C, with the major difference of the Model D having an own, crane-mounted marine loading arm, which enables the Model D to unload the cargo by itself, for when really no harbour or other facilities are available.

This also enables the Model D to be used as an oiler.

Pattern 263 Model E

Model E is the Floating Production Storage and Offloading Unit, developed from the Model D. It basically is a floating offshore oil refinery and storage tank.

Due to the need for technical equipment for refinery purposes, the rear tanks have been removed and replaced by said equipment, powered by the Diesel generator staying where it was. However, the engines do not produce enough power to power both engines and refinery equipment at the same time.

The Pattern 263 Model E has a production capacity of 25,000 barrels of oil per day and 4.5 million cubic metres of gas per day, a storage capacity of 300 million litres (or 1.88 million barrels) and can support four tanker offloading buoys, as well as draw oil or gas from eight well centres by injection lines.

Model E can be powered by a fraction of the own produce.

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