There are many ways of dealing with an oil spill. Direct mechanical removal from the water surface is in general the preferred way since it is the fastest solution with the least impact on society and environment. The most effective way of mechanical recovery of oil spills is Dynamic oil recovery. Sweeping arms make dynamic oil recovery possible. The oil recovery vessel navigates with the sweeping arms on its sides directly through the oil spot and sweeps it off the water surface. The sweeping arms collect the oil between the arms and the ship’s hull and by moving forward a thicker layer of oil is built up in front of them. The oil flows is guided by the arms and flows towards the skimmers in the inner pontoon of the sweeping arm. The brush- or weir skimmers directly skim the oil off the water surface and pump it into the oil recovery tank of the ship, leaving a clean water surface behind.