Experimental Research on Water Column Oscillations in Moonpool of a Drillship in Downtime Period
Sivabalan Ponnappan1, MSP Raju2
1Sivabalan Ponnappan, Naval Architecture and Offshore Engineering, AMET University, Chennai, Tamilnadu, India.
2MSP Raju, Naval Architecture and Offshore Engineering, AMET University, Chennai, Tamilnadu, India. 

Manuscript received on November 20, 2019. | Revised Manuscript received on November 28, 2019. | Manuscript published on 30 November, 2019. | PP: 7152-7155 | Volume-8 Issue-4, November 2019. | Retrieval Number: D5254118419/2019©BEIESP | DOI: 10.35940/ijrte.D5254.118419

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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)

Abstract: A drillship is a kind of merchant vessel with a self-propulsion unit and drilling equipment used for oil exploration. The major difference with the merchant vessel is the moonpool. A moonpool is a vertical opening from the continuous deck to the keel plate of the vessel for drilling operations and other applications like the launching of measuring instruments. This moonpool opening allowing the entry of water into the vessel. The water motion within the moonpool is mostly related to the encountering wave frequency, the geometry of the moonpool and the draft condition of the vessel. The major amplitude of the water particle motion within the moonpool, either may be in the sloshing mode or in piston mode. This water motion leads to the entry of green water on the deck during the rough weather condition. This is known as the downtime period of a drillship, during this time the operation of the drillship is in off-mode. This paper presents the study about the downtime period of drillship experimentally with rectangular moonpool.
Keywords: Drillship, Moonpool, Piston Mode, Sloshing Mode.
Scope of the Article:  Operational Research.