Emergency main ballast tank blow

When blowing is called in sailor language the complete discharge of ballast tanks of a submarine once it has penetrated the water surface ( at least with the snorkel). The previous partial emptying of the cells, mostly with stored compressed air, ie blowing. The opposite process - as quickly as possible to dive to get to safety before about water bombs - called Alarmtauchen.

Is blown at a Ausblaseeinrichtung which conducts either the exhaust gases of the diesel engine in the ballast tanks or outdoor air by a fan pushes. The former case has the advantage that the exhaust gases of the diesel engine to effect preserving the inner walls of the ballast tanks. Ausblaseeinrichtungen be incorporated to save compressed air. Since a boat begins to rise with only partially emptied diving cells, a significant portion of the cell volume can be blown out ( especially if there is a snorkel).

Blowing is also called the complete discharge of ballast tanks with the help of a Notausblaseeinrichtung. In this case, either stored compressed air or external air is used, but is usually produced by chemical reactions of special gas inflators.

Because of the angle and the rate of climb of the submarine can be very large when blowing out, the crew must make sure that no parts flying around inside the submarine.