  We are concerned with a one dimensional flow of a compressible fluid which
may be seen as a simplification of the flow of fluid in a long thin pipe. We
assume that the pipe is on one side ended by a spring. The other side of the
pipe is let open -- there we assume either inflow or outflow boundary
conditions. Such situation can be understood as a toy model for human lungs. We
tackle the question of uniqueness and existence of a strong solution for a
system modelling the above process, special emphasis is laid upon the estimate
of the maximal time of existence.
