Automatic cleaned drain piping system on crosshead type two-stroke engines, having a slow rotating centreless flexible spiral auger fixed mounted in the piping system

An automatic cleaning system comprising a rotating flexible centerless spiral auger fixed mounted in a piping system, the piping system comprising drain piping draining from piston rod stuffing boxes of an engine, drain piping draining from scavenge air space and piston underside space of the engine, and drain piping draining from scavenge air receiver of the engine, wherein the centerless flexible spiral auger fixed mounted in a pipe of at least one of the drain piping of the piping system, where a main transport through the piping system is the free flow of liquid which flows in the hollow part of the centerless flexible auger and in the space between the auger and the inner diameter of the pipe.