The roof saves from emissions. Hermetic.

Large value is attached to urban-industrial environment conservation. By the level of omission "Orsknefteorgsintez" approaches the rates of the modern plants of the European countries, and it's a worthy result of investments and efforts, but the work is still going on. There was practically solved the task of equipment of reservoirs with the pontoon roofs. Huge silver tanks with oil products are seen from afar. Each of them vaporized about 3 litres of hazardous substances per hour, and at pump back of oil products a 10-metres gaseous interlayer squeezed in atmosphere. Taking into consideration, that there are tens of reservoirs at ONOS, it's not hard to count, that ecology suffered greatly. Until recently. Now the situation at some reservoirs is a little bit different: in compliance with increase and decrease of oil level the pontoon roof tightly covers the reservoir, making the air above it practically pure. 
This year there was invested 700 thous Rubles in repair of the pontoon roof of one of the reservoirs.
  Decrease of negative effect of the enterprise is still among priority tasks of the enterprise, and this contributes to the improvement of ecological situation of the town and the region.