During the offshore substructure installation phase, jackets are designed to be either self-upending or upended with the assistance of a ballasting system or crane vessel. In order to ensure that the launched jacket can maintain the buoyancy and upend itself at the launch sequence, diaphragm closures are used to seal the jacket legs and skirt sleeves. It is an effective procedure that not only enables the jacket to float in the sea, but also makes it easy to maneuver the installation on site.
Our Diaphragm Closure (DC) is made from highly reinforced rubber and designed to withstand the hydrostatic pressure during jacket flooding operations. Designed and fabricated with the highest quality polymers to ensure efficient, reliable performance, these closures are attached to the legs and skirt sleeves by means of fastening ring/ flanges that also hold the rubber diaphragms. They can be quickly and easily pierced by the pile or by a cutting device to facilitate the installation movement.
DC can be customized to specific project requirements and operating conditions.
Trelleborg’s jacket leg can system is designed to encompass the sealing needs during the installation of an oil and gas/HVDC jacket substructure.
Provide buoyancy during the installation of the substructure
Highly reinforced rubber
Hydrostatic tested to 1.5 times of the operating pressure