As marine resources have been actively explored. a large number of offshore drilling platforms such as drillships and semi-submersible rigs have been built in many shipyards. The drilling system is the key feature that defines the characteristics of the platform. The operation of the drilling system is usually focused on the tubular handling. https://www.diegojavierfares.com/deal-alert-Has-the-Tribulation-Begun-Study-Guide-Avoiding-Confusion-and-Redeeming-the-Time-in-These-Last-Days-must-buy/