| 摘要 |
PURPOSE: A damper structure of a closed derrick is provided to protect internal devices, workers, and working environment inside a derrick and a moon pool by compensating and offsetting negative pressure or positive pressure generating in the derrick or the moon pool. CONSTITUTION: A damper structure of a closed derrick(10) comprises a communication duct and an opening/closing damper(35). At least one communication duct is installed in the side surface of the closed derrick. The opening/closing damper is connected to the communication duct and opens and closes the communication duct. The damper structure of the closed derrick allows air to selectively flow in or out to the closed derrick. |
