Built at Zamil Shipyard in the port of Dammam, two floating drydocks, intended for maintenance and repair works of naval crafts in Saudi Arabia, are being commissioned by Constructions Mécaniques de Normandie (CMN), a French naval ship design and construction company.
Mammoet’s Saudi Arabia branch was contracted by CMN to launch the drydocks via float-off operation. Using its vast expertise in marine load-out and float-off operations, Mammoet undertook all engineering, procurement, logistics and execution for the successful float-off of the drydocks.
In the concept stage, the team proposed a solution for the float-off that has never been performed in the Kingdom before. The solution entailed the use of a large floating dock with the capability to perform float-off directly at the jetty. The use of the proposed dock eliminated the traditional offshore float-off and related logistics. This gave the client a commercial advantage that in addition to the costs, saved a significant amount of time.
A thorough transport and marine engineering, multiple risk assessments and warranty surveys were performed to ensure safe and efficient execution. The floating dock, mooring and ballasting equipment were mobilized from UAE along with a specialized team to execute the operation. It was performed in accordance with the requirements of the client, warranty surveyors, shipyard and port authorities and environmental regulations.
Each drydock, weighing 1,450t and measuring 85m long, 34m wide and 11m high, was safely transported from the fabrication facility to the quayside, then loaded out onto the floating dock using a self-propelled modular transporter (SPMT) with 96 axle lines, before being floated off successfully at the right time and tide.