Polar vessel having a derrick

Patent metadata

Field	Value
Publication number	US-9376199-B2
Application number	US-201113812015-A
Country	US
Kind code	B2
Filing date	Jun 22, 2011
Priority date	Jul 27, 2010
Publication date	Jun 28, 2016
Grant date	Jun 28, 2016

Abstract

Provided is an arctic ship with a derrick, which can stably maintain an internal environment of an enclosed derrick. The arctic ship with a derrick includes: the derrick forming an enclosed space blocked from outside air; a moonpool coupled to a lower portion of the derrick to communicate with the derrick and blocked from the outside air; and an air supply/exhaust device installed to communicate an inner space of the derrick or the moonpool with the exterior, wherein air condition of the inner space is maintained or controlled at a predetermined range by the air supply/exhaust device.

First claim

What is claimed is:

1. An arctic ship, comprising:
a derrick defining an enclosed space blocked from outside air;
a moonpool coupled to a lower portion of the derrick to communicate with the derrick and blocked from the outside air;
an air supply/exhaust device installed to communicate an inner space of the derrick or the moonpool with a region exterior to the derrick, the air supply/exhaust device comprising a supply unit including a supply fan to supply the outside air to the derrick or the moonpool, and comprising an exhaust unit including an exhaust fan to exhaust the supplied outside air through an upper portion of the derrick;
one or more temperature sensors installed inside of the derrick to monitor an internal temperature of the derrick;
one or more pressure sensors installed inside of the moonpool to monitor an internal pressure of the moonpool; and
a control unit to control the operations of the supply unit and the exhaust unit based on internal temperature and pressure information monitored by the one or more temperature sensors and the one or more pressure sensors,
wherein air condition of the inner space is maintained or controlled at a predetermined range by the air supply/exhaust device, and
wherein the arctic ship has a structure enclosed from the derrick to the moonpool, and compensates or offsets a negative pressure or a positive pressure generated in the enclosed derrick and the moonpool due to influence of waves transferred to the moonpool.

2. The arctic ship according to claim 1 , wherein the supply unit comprises a heater to heat the supplied outside air.

3. The arctic ship according to claim 1 , wherein the supply unit and/or the exhaust unit comprises an open/close valve which opens or closes a flow of supplied or exhausted air.

4. The arctic ship according to claim 1 , wherein the supply unit and/or the exhaust unit comprises a supply louver which prevents the inflow of large particles and rainwater.

5. The arctic ship according to claim 1 , wherein the air supply/exhaust device further comprises an openable/closable air supply port through which the outside air is supplied to the derrick.

6. The arctic ship according to claim 1 , further comprising a heat blower provided inside the derrick to heat air to assist with ventilation.

7. The arctic ship according to claim 1 , wherein the operating speeds of the supply fan and the exhaust fan are changed depending on temperature of the outside air.

8. The arctic ship according to claim 1 , further comprising:
a duct through which the outside air supplied by the supply unit is transferred to the derrick or the moonpool; and
a wire mesh provided at an end of the duct which is coupled to the derrick or the moonpool.

9. The arctic ship according to claim 1 , wherein the air supply/exhaust device comprises a damper unit installed in at least one side of the derrick to selectively supply air to the inside of the derrick or exhaust air from the inside of the derrick.

10. The arctic ship according to claim 9 , wherein the damper unit comprises:
one or more communication ducts communicating an outer space of the derrick with an inner space of the derrick; and
one or more open/close dampers coupled to the communication ducts to open or close the communication ducts.

11. The arctic ship according to claim 10 , further comprising:
a mesh installed in an end of the communication duct within the inner space of the derrick; and
an open/close damper installed adjacent the mesh installed in the end of the communication duct within the inner space of the derrick, and
wherein an end of the communication duct in the outer space of the derrick is inclined downward.

12. The arctic ship according to claim 10 , further comprising:
a fingerboard provided in an upper inner side of the derrick, wherein the damper unit is disposed under the fingerboard.

13. The arctic ship according to claim 1 , wherein the temperature sensors comprise:
a first temperature sensor installed at an upper portion of the derrick;
a second temperature sensor installed at a middle portion of the derrick; and
a third temperature sensor installed at a lower portion of the derrick.

14. The arctic ship according to claim 13 wherein the exhaust unit is disposed in an upper inner side of the derrick, and further comprising:
a fingerboard disposed across a middle inner portion of the derrick,
wherein the first temperature sensor is disposed adjacent to the exhaust unit, the second temperature sensor is disposed above the fingerboard, and the third temperature sensor is disposed under the fingerboard of the derrick.

15. The arctic ship according to claim 1 , further comprising a crown block section disposed at an upper portion of the enclosed derrick such that a crown block is installed and an installation workspace is formed thereinside, and
wherein the air supply/exhaust device is installed in the crown block section such that the installation workspace communicates with the exterior.

16. The arctic ship according to claim 15 , further comprising:
open/close valves installed in the exhaust unit and the supply unit to selectively allow an outside air flow.

17. The arctic ship according to claim 16 , wherein the width of the crown block section is widened upwardly, and the width of the installation workspace is widened upwardly.

18. The arctic ship according to claim 17 , wherein a pair of inclined planes are symmetrically formed on both sides of the crown block section, such that an upper circumference of the crown block section is formed to be wider than a lower circumference thereof.

Assignees

• Choo Keum Dae
• Lee Yu Young
• Choi Jung Yul
• Kang Jung Soo
• Brittin D Scott
• Daewoo Shipbuilding & Marine
• Transocean Sedco Forex Ventures Ltd

Inventors

• Choo Keum Dae
• Lee Yu Young
• Choi Jung Yul
• Kang Jung Soo
• Brittin D Scott

Classifications

• B63B35/4413 Primary

  Floating drilling platforms, e.g. carrying water-oil separating devices · CPC title

• B63J2/02 Primary

  Ventilation; Air-conditioning · CPC title

• E21B15/00

  Supports for the drilling machine, e.g. derricks or masts · CPC title

• B63J2/10

  Ventilating-shafts; Air-scoops (for port-holes B63B19/04) · CPC title

• F24F13/10

  movable, e.g. dampers · CPC title