How it works
AOD involves a process which consists of several key stages. First, Stork conducts an inspection survey using thermal imaging cameras to see the sand accumulated inside the live production separator. A jetting unit then injects high volume, high pressure water into the separator to agitate and fluidise the sand.
The sand slurry is removed and taken to a Solids Separation Package, where it is course filtered and the pressure is reduced to 4.5 Bar. A Spin Filter and Hydrocyclone Vessel then separate the solids from the water.
In the Spin Filter, denser solid material is removed and deposited in the Sandwash Tank. The remaining lower density material is re-pressurized and passed into the Hydrocyclone Vessel where further solids are removed.
The removed sands are collected in the Sandwash Tank to be washed using a solvent and mechanical agitation to less than 1% oil content. Once completed, the sand is both clean and environmentally safe for disposal overboard.
The AOD system ensures that offshore sand disposals are in line with environmental diskharge limits while eliminating the cost of onshore waste clean-up.