• Upending Control Systems

    Your partner for a Lifetime of Lifting!

    Over the last 25 years we have gained the experience to be your trusted partner in the ballasting, leveling and set down of barge launched jacket structures and steel-constructed gravity-based jacket structures.

    We provide safe and reliable products for righting and lowering jackets to the seabed. our complete Upending Control Systems (UCS) include flood and vent valves, tube bundles, the Upending Control Center (UCC), flotation tank release systems, rigging release systems, HPU’s, umbilical and umbilical winches. We also provide template leveling systems for accurate positioning control of subsea drilling templates. 


    Depending on the size and weight of the jacket due to the installation water depth and topside capacity, a typical jacket structure can have more than 100 hydraulically actuated ball valves mounted in air tight compartments within the jacket legs and buoyancy tanks. Coordinating the opening and closing of the flood and vent ball valves to provide accurate active ballasting into each compartment is key to a safe and successful jacket installation. The operation of the upending control system (UCS) is manual from the upending control center (UCC), which is mounted on the jacket above the water line. The upending control center (UCC)is designed to protect the operating equipment from slam forces during launch and is connected by up to 4km of tube bundles to the flood and vent valves.

    Prior to launch, it is critical to ensure the jacket leg and buoyancy tank valves are closed and air tight compartments fully sealed. This is done using a remote pressure monitoring system that can be read from simple pressure gauges or from electrical pressure transducers via a laptop or PLC screen.

    After launch, skilled operators are transferred to the jacket and enter the upending control center (UCC). The upending control center is designed to allow the operator freedom of movement and safe access to control panels throughout the righting of the jacket; from the launch position (shown below) to true vertical. The upending control system (UCS) is equipped with a bull’s eye levelling gauge and an electronic level device to assist with jacket levelling prior to final set down using the installation vessel crane.

    As an alternative to operators boarding the jacket, we offer two options to carry out operations from the installation vessel. The first mounts the upending control center (UCC) on the installation vessel and runs an umbilical (or multiple umbilicals) from the upending control center (UCC)to an interface panel on the jacket. The second mounts the upending control center (UCC) on the jacket and operates the control valves electronically from a remote control station. This method uses a telemetry radio frequency communication system to provide control from a PLC or laptop.


    • Proven and reliable design 
    • Environmentally friendly water-glycol hydraulic control fluid 
    • Ergonomic UCC design housing hydraulic control valves and electric monitoring system 
    • Stored energy system within the upending control center
    • Multiple back-up options available 
    • Remote control capability eliminates the need for personnel on the jacket during set down



    The upending control system is operated using hydraulic power and monitored using an electrical power supply

    • Hydraulic power stored in accumulator banks 
    • Electrical power supplied by multiple battery packs
    • Back-up power provided from an umbilical between the installation vessel and upending control center
    • Solar power for re-charging at sea