To remove the oil from the whole surface of the basin, the customer decided to install an Oil Skimmer with oil collector tube. To reach the whole surface with the oil collector tube, a tube guide was installed. The skimmer runs 24 hours/day in order to clean the water as good as possible. The oil and small amounts of water, which are delivered by the Oil Skimmer, float into a decanter. The water settles at the bottom of the decanter, while the oil floats on top. The oil floats over a weir into the oil collecting tank, while the water floats back into the cooling water basin. With an electronic speed control, the capacity of the Oil Skimmer is adjusted to the amount of oil on the water surface. Additional protection contacts make sure, that the motor does not become too hot at low speed. To operate the Oil Skimmer in winter times, the Oil Skimmer, the oil chute and the decanter tank are heated. The heating starts at temperatures lower than 3 °C. The level in the oil collecting tank is continuously controlled. When the oil level reaches the maximum level of the oil collecting tank, the Oil Skimmer is switched off and an alarm is shown on the central switchboard of the factory.