Technical Field Invention relates to a floating structure suitable for refuelling of the following transport: marine vessels, such as yachts, boats, jet skis etc.; aquaplanes; helicopters; cars; trucks and/or other transportation means.

Background Art

United States patent No. 6,786,166 and European patent No. 1224113 discloses a liquefied gas storage barge with concrete floating structure. The floating structure of reinforced and pre-stressed concrete containing tanks for liquefied gas. Said tanks are cylindrical tanks each having a cross-section perpendicular to its longitudinal axes that comprises a preferably circular curved portion corresponding to the bottom of said tank, said portion being preferably a bottom half-circumference resting directly on the concrete bottom of the barge, which barge bottom is in the form of adjacent part- cylindrical troughs, each part-cylindrical trough having the same preferably circular, partially curved section in register with the bottom of each tank.

United states patent No. 3,828,708 discloses a modular pre-stressed concrete marine vessel having plurality of integrally cast longitudinal modules. Each of said longitudinal modules comprising a concrete body; support beams extending vertically between said bottom slab and said deck slab, and parallel to said side walls; wherein said walls, slabs and support beams having a plurality of openings extending longitudinally there- through; a reinforcing steel network positioned within said body for pre-stressing said body.

International patent application publication No. WO2009/131543 discloses an offshore fuel storage facility that includes a spine structure supported on a seabed; and a plurality of floating storage modules moored adjacent the spine structure, each of the floating storage modules capable of storing at least one type of petrochemical product. The facility may also include a fixed platform that houses various support facilities, and at least one jetty that provides docking space for one or more ships to load and unload petroleum and petrochemical products. Summary of the Invention

The object of the invention is to provide a safe and easy maintainable floating structure for refuelling.

Aim of the invention is reached by designing a floating structure for refuelling comprising a hull made of reinforced concrete. The hull can be divided in at least two compartments. Each compartment is provided with at least one access hatch.

The floating structure comprises a fuel tank arranged in the compartment of the hull. The fuel tank is arranged so that between walls of the compartment and fuel tank a space is maintained, therefore the fuel tank can be inspected during its use. This feature substantially increases a serviceability of the floating structure. Service personal can inspect the fuel tank in any moment. The fuel tank can be made of steel, stainless steel or composite material. The fuel tank can store petrol, diesel, gas or any other petroleum products.

The floating structure further may comprise at least one ballast tank arranged in one of the compartments and configured to keep the floating structure in a predetermined level, and an engine room for providing a power supply for the floating structure. A power source in the engine room can be diesel generator, electric batteries, fuel cells or any other means of power source. The ballast tanks are part of ballast-drainage system for trimming the floating structure. The ballast-drainage system further may comprise a pump, pipe system, valves and filters.

One of the compartments is configured to be a cofferdam that is arranged between two compartments comprising fuel tanks in order to prevent two different fuels from mixing with each other. If the floating structure comprises a fuel tank of petrol and another tank of diesel, then between these two fuel tank compartments another compartment - cofferdam - is provided.

The hull is designed to have a necessary strength to fulfil its' functions. Necessary strength is provided due to accurate fulfilment of rules and requirements of classification societies.

The floating structure comprises a mooring arrangement such as the following, but not limited to: piles, anchors, ropes etc.

The floating structure is provided with fuel piping system. It may comprise pipes for fuel delivery and/or for vapour extraction from the fuel tank and/or for the fuel tank ventilation. Brief description of the drawings

Fig. 1 illustrates a floating structure comprising a hull 1, three fuel tanks 2, two ballast tanks 3, an engine room 4 and a cofferdam 5, steel armature 7 and the elevated upper deck 10.

Fig. 2A is a top view of the floating structure without an upper deck 10 (shown in Fig. 2B and Fig. 2C) for ease of understanding.

Fig. 2B is a section view of the floating structure in a longitudinal direction.

Fig. 2C is a section view of the floating structure in a transversal direction.

Fig 3 illustrates the floating structure with an upper deck 10. The hull 1 is displayed in a section view for the ease of understanding.

Fig. 4 is a section view of the floating structure in a longitudinal direction showing compartments 6 and fuel tanks 2.

A floating structure for refuelling comprising a hull 1 made of reinforced concrete. Said concrete comprises steel armature 7 (Fig. 1). The hull 1 is divided in seven compartments 6. Three of seven compartments 6 are arranged to accommodate fuel tanks 2. Each fuel tank 2 is arranged so that between inner walls of the compartment 6 and the fuel tank 1 a space A is maintained. Therefore, each fuel tank 2 can be inspected during its use (see Fig. 1 - Fig. 4).

The floating structure further comprises ballast tanks 3 arranged in two compartments 6 and configured to keep the floating structure in a predetermined level.

One of the compartments 6 is configured to accommodate an engine room 4 for providing a power supply to the floating structure.

Another compartment 6 is configured to be as a cofferdam 5. The cofferdam 5 is arranged between two compartments 6 comprising fuel tanks 2 in order to prevent two different fuels from mixing with each other.

Another embodiment of the floating structure comprises service facilities 11 and 12 on the upper deck 10 of the floating structure (see Fig. 3). A fuel contained in the fuel tanks 2 is fed to the fuelling stations 12 by means of pipelines and pumps 13.

While the inventions have been described with reference to certain embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the invention. Therefore, it is intended that the inventions not be limited to the particular embodiments disclosed herein.