Trelleborg developed an off-the-shelf range of subsea modular buoys, called Njord NBs, for moderate subsea uplift. Suitable for subsea equipment installation, each buoy core varies in density to suit individual project water depth needs. By simply adding or removing individual units from the nested flotation stack, uplift can easily be adjusted. Njord NBs are engineered to offer a durable, short lead time option to complete our range of subsea buoyancy solutions. The unique nesting design of the individual buoyancy elements enables them to quickly assemble into a rigid structure with a specific uplift. The assemblies are held together and handled by using soft slings. The slings have numerous benefits including corrosion resistance, ease of handling, and no loss of buoyancy when compared to metal hardware. These soft slings are available for all assemblies to quickly and easily secure a nested buoyancy structure together for deployment.
Njord NBs are are manufactured from a low density carbon fiber macrospheres and syntactic foam. The core is then encapsulated in a high density polyethylene shell for impact and abrasion protection needed for the harsh offshore environment. Njord NB assemblies are available at depth ratings from 1,000 to 4,000 meters.