Ventilation apparatus of a drillship

Patent metadata

Field	Value
Publication number	US-9862474-B2
Application number	US-201113811985-A
Country	US
Kind code	B2
Filing date	Jun 22, 2011
Priority date	Jul 27, 2010
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

Abstract

Provided is a ventilating apparatus for a drill ship, which allows a drill ship sailing around an arctic region to maintain appropriate temperature and pressure. The ventilating apparatus for the drill ship includes: a derrick forming an enclosed space blocked from the exterior; a moonpool formed under the derrick; an air supply device supplying outside air to the moonpool or the derrick; and an air exhaust device exhausting the supplied outside air out of the top of the derrick.

First claim

What is claimed is:

1. An arctic drill ship, comprising:
a propulsion system to sail the artic drill ship about the sea;
a ship deck;
a derrick installed on the ship deck;
a moonpool formed under the derrick which is in contact with seawater and exposed to sea waves, and wherein the derrick and the moonpool collectively form a compartment within the artic drill ship that extends from the derrick to a surface of the sea and defines an enclosed space blocked from an exterior environment, the enclosed space of the compartment being susceptible to air pressure fluctuations arising from interaction of the sea waves with the moonpool throughout drilling operations; and
a ventilation apparatus, the ventilation apparatus including:
an air supply device arranged to supply outside air to the enclosed space of the compartment collectively formed by the derrick and the moonpool, the air supply device coupled to a moonpool area defined by the moonpool at a lower end of the enclosed space;
an air exhaust device arranged to exhaust the supplied outside air out of the enclosed space through a top end of the derrick opposite the moonpool area; and
a pressure regulating damper provided in a side of the derrick between the top end and the moonpool area which supplies air to or exhausts air from the enclosed space to prevent rapid pressure variation such that the internal air pressure within the compartment collectively formed by the derrick and the moonpool is constantly maintained despite the interaction of the sea waves with the moonpool throughout drilling operations.

2. The artic drill ship according to claim 1 , wherein the air supply device comprises a heater to heat the outside air.

3. The artic drill ship according to claim 1 , wherein the air supply device comprises a shut-off damper to shut off an air flow when an emergency situation occurs while the artic drill ship is sailing.

4. The artic drill ship according to claim 1 , wherein the air supply device comprises a supply louver to prevent an inflow of particles other than air.

5. The artic drill ship according to claim 1 , wherein the derrick comprises an openable or closable air supply port through which the outside air is supplied.

6. The artic drill ship according to claim 1 , further comprising a heat blower provided inside the derrick to heat air for effective ventilation.

7. The artic drill ship according to claim 1 , wherein the air exhaust device comprises an exhaust louver.

8. The artic drill ship according to claim 1 , wherein,
a supply fan is installed in the air supply device,
an exhaust fan is installed in the air exhaust device, and
the operating speeds of the supply fan and the exhaust fan are changed depending on temperature of the outside air.

9. The artic drill ship according to claim 1 , wherein the air supply device supplies the outside air to at least one of the moonpool and the derrick through a duct, and wherein a wire mesh is provided at an end of the duct which is coupled to the at least one of the moonpool and the derrick.

10. An arctic drill ship, comprising:
a ship deck;
a derrick installed on the ship deck;
a moonpool formed under the derrick which is in contact with seawater and exposed to sea waves, and wherein the derrick and the moonpool collectively form a compartment within the artic drill ship that extends from the derrick to a surface of the sea and defines an enclosed space blocked from an exterior environment, the enclosed space of the compartment being susceptible to air pressure fluctuations arising from interaction of the sea waves with the moonpool throughout drilling operations; and
a ventilation apparatus, the ventilation apparatus including:
an air supply device arranged to supply outside air to the enclosed space of the compartment collectively formed by the derrick and the moonpool, the air supply device coupled to a moonpool area defined by the moonpool at a lower end of the enclosed space;
an air exhaust device arranged to exhaust the supplied outside air out of the enclosed space through a top end of the derrick opposite the moonpool area; and
a pressure regulating damper provided in a side of the derrick between the top end and the moonpool area which supplies air to or exhausts air from the enclosed space to prevent rapid pressure variation such that the internal air pressure within the compartment collectively formed by the derrick and the moonpool is constantly maintained despite the interaction of the sea waves with the moonpool throughout drilling operations.

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

• B63J2/10

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

• B63B35/4413 Primary

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

• B63J2/02 Primary

  Ventilation; Air-conditioning · CPC title