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1. WO2007148982 - AN ARRANGEMENT FOR A CYLINDRICAL TANK FOR TRANSPORTATION OF LIQUEFIED GASES AT LOW TEMPERATURE IN A SHIP

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[ EN ]

CLAIMS

1. An arrangement for a horizontal and generally cylindrical tank (2) for transportation of liquefied gases at low temperature onboard ships, wherein the tank (2) is supported in the ship in at least two supports (12), and wherein the tank has an internal reinforcement com-prising a perforated and stiffened bulkhead,

characterized in that the internal reinforcement is comprising two adjacent circular and perforated bulkheads (3), and that a framework system of crossing stiffeners (4-7) is arranged and welded to the bulkheads in the intermediate space.

2. An arrangement according to claim 1,
wherein an aft dome (23) is arranged in conjunction with the two adjacent circular and perforated bulkheads (3) at an aft cargo tank saddle support for enabling the aft dome by internal reinforcements (24, 25) and external brackets (26) in line with bulkheads (3) to transfer transverse and longitudinal forces between cargo tank (2) via intermediate elements (22, 23) to the hull (1), and simultaneously to allowing the aft dome (23) to slide in the vertical direction.

3. An arrangement according to claim 1 or 2,
wherein a forward dome (29) is arranged in conjunction with the two adjacent circular and perforated bulkheads (3) at a forward cargo tank saddle support for enabling the forward dome by internal reinforcements (30) and external brackets (32) in line with bulkheads (3) to transfer transverse forces between cargo tank (2) via intermediate elements (27, 28) to the hull (1), and simultaneously to allowing the forward dome (29) to slide in the vertical and longitudinal directions.

4. An arrangement according to claim 1,
wherein the bulkheads (3) have openings (10) areas of the respective bulkhead limited by the nearest girders (4-7).

5. An arrangement according to claim 1 or 4,
wherein space between the bulkheads (3) is utilized for protective running of pipes and electric cables (9) , and for providing access (8) between the top and bottom of the tank.

6. An arrangement according to claim 1, 4 or 5,
wherein the stiffeners are comprising tangential and radial oriented plates (6, 7).

7. An arrangement according to claim 6,
wherein stiffeners also are comprising vertical and horizontal plates (4, 5).

8. An arrangement according to claim 6 or 7,
wherein at least some of the stiffening plates (4-7) are provided with openings (14).

9. An arrangement according to any one of the preceding claims,
wherein the support system is of the saddle type support (12) with a bearing insulation material (13) in the same length as the distance between the internal bulkheads (3), the 'tween material (13) being locked against movement by flat bar flanges (19) welded to the shell (17) of the tank (2) and reinforced with brackets (16,18) preferably being sniped, sniped brackets (15) also being provided between the shell (17) of tank (2) and the bulkheads (3).

10. An arrangement according to claim 9,
wherein pressure transducers are provided and arranged along the periphery of the support system, the vertical pressure from tank to supports being continuously monitored and re-corded.

11. An arrangement according to any one of the preceding claims,
wherein the tank (2) has a cargo volume in the range of 40.000 - 60.000 m3, and wherein the distance between the adjacent bulkheads (3) at a support preferably is in the range of 1-4 metres.

12. A method for the construction of a generally cylindrical tank for transportation of liquefied gases at low temperatures in ships, which tank (2) is provided with at least two areas for support in the ship (1), each area having internal reinforcement comprising a circular and perforated bulkhead, characterized in that the reinforcement is made in the form of two adjacent perforated bulkheads (3) and is fabricated with oversized diameter and a framework of crossing stiffeners (4-7) welded between the bulkheads (3), whereupon the bulkheads (3) and outer stiffeners (7) are cut to exact diameter and roundness before shell plates (17) of the tank (2) are welded to the bulkheads (3) and outer stiffeners (7).