Crane Storage, Mobilization and Installation for Offshore Transporter Vessels

Core was commissioned by Hornbeck Offshore, a leading provider of marine transportation services, to receive, store and install heavy-lift cranes for use on newly constructed offshore supply and installation vessels. This is an ongoing project and required Core’s team to engineer specific solutions for receiving and transporting the cranes to storage as well as moving them dockside for installation.

The first crane was received in January 2015. Each crane weighs approximately 550 tons and has a lifting capacity of 250 tons. We first have to use our heavy-lift capabilities to lift and position Hornbeck’s cranes onto a remote-controlled transporter — specifically, the transporter has 44 lines (set doublewide at two lines by 22 lines), creating an overall bed size of 101 feet by 17.5 feet. Once loaded onto the transporter, the cranes must be moved to storage where they are positioned on custom stands that work in concert with the vertical mobility of the transporter. With the vertical mobility of the transporters, we are able to first jack up and then lower each crane onto the stand for storage.

As of April 2017, Core has received two of Hornbeck’s new vessels for crane installation. When each vessel is received, our team loads the crane back onto the transporter, which is then brought dockside for vessel installation. This primarily involves lifting, placing and welding each crane on the vessel’s pedestal. Once complete, Hornbeck is able to deploy these offshore supply and installation vessels for subsea installation work and for use in supplying offshore oil and gas installations.

Decommissioning of Hero Demolition’s Safe Britannia

In July 2016, Hero Demolition Corporation hired Core for our deepwater port facility as well as operational capacity to execute a project involving their accommodation semisubmersible, the Safe Britannia. They docked the rig at our private port facility to remove and scrap the underwater thrusters, lowering the overall weight of the rig for total decommissioning at another facility with shallower water depth.

The Safe Britannia had an overall underwater depth of 40 feet, nine of which were made up of the thrusters. Core first procured specialized underwater welding services to remove the anchor guards from the thrusters, which were then scrapped. The thrusters were later removed from the rig, unloaded and stored at Core until a buyer was found. Core’s team for this project included welders, riggers, crane operators and other staff to plan and execute the work.

Receiving and Long-Term Storage of Equipment for Subsea 7

Subsea 7 is a seabed-to-surface engineering, construction and services contractor for the offshore energy industry. In 2006, Subsea 7 contracted with Core for long-term shore-based services as well as storage, maintenance and mobilization of project equipment. In March 2016, Subsea 7 needed support to prepare the FMOG Holstein for three oilfield projects in the Gulf of Mexico.

Core received 13 large reels from Subsea 7, weighing between 150 and 250 tons, and stored them dockside while assisting with hydraulic and installation testing on the reels before their deployment to the Gulf. After storing and preserving the reels, Core assisted in mobilization and loading of the equipment onto installation vessels to support each of Subsea 7’s projects.