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1. (WO2007004896) VESSEL FOR TRANSPORT OF COMPRESSED NATURAL GAS
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175335-EH

Claims

1. Vessel comprising a number of composite storage tanks for transport of compressed natural gas (CNG) or a combination of gas and liquid, which tanks have an elongated, cylindrical intermediate section and a lower end and an upper end, the tanks being arranged side-by-side vertically standing in the vessel,
characterized in that the hull, the bulkheads and the deck of the vessel form a closed space enveloping all tanks except from the upper end of each tank or selected tanks, for which tanks the upper end extends sealingly out of the closed space, all feed-throughs in the tanks with couplings for loading and unloading are outside of the closed space, at the upper end of the tanks, and
the tanks are supported such that each tank can expand or contract freely within the operating range of the tanks with respect to pressure and temperature.

2. Vessel according to claim 1,
characterized in that each tank has a height of about 30 m and diameter of about 3 m, and half-sphere-formed upper and lower ends.

3. Vessel according to claim 1,
characterized in that each tank extends in vertical direction from the bottom of the vessel to deck level or above deck level.

4. Vessel according to claim 1,
characterized in that the storage tanks are fixedly supported in the lower end.

5. Vessel according to claim 1,
characterized in that all manifolds, valves and connections for loading and unloading of the tanks are outside the closed space, in open area at deck level on the vessel.

6. Vessel according to claim 1,
characterized in that a concentric and multi-functional double pipe with perforated outer pipe extends down to the bottom of each tank for loading, unloading and flushing of the inner surface of the tank, respectively.

7. Vessel according to claim 1, characterized in that the storage tanks are single-standing and each tank can be replaced by lifting it up vertically from the vessel through a socket extending up above the deck level of the vessel.

8. Vessel according to claim 1,
characterized in that the tanks have resilient, flexible sealing in the upper end, for sealing between the closed space and deck level.