| 摘要 |
<p>It is customary that a sewage truck be called when finding or expecting pollution of the contents of a petrol or an oil tank to suck up the entire tank contents and take it to destruction. The invention presumes that the tank contents normally separates in horizontal layers of useless, polluted liquid and fully usable liquid, respectively, and by the invention it is intended to produce a selective sucking up of these fractions to a sewer tank (4) and an extra tank (2), respectively, so that the extra tank (2) receives an immediately reusable product, which may possibly be returned to the tank from where it was sucked. The selective filling of the sewer tank (4) and the extra tank (2) is obtained through establishing a possibility for inspecting the sucked up liquid at its entering the sewer tank and a valve device for facilitating the switch-over referred to.</p> |
