It is needless to say that in order to make another remarkable progress in design and manufacturing, systems integration is important. From this stand point of view, the authors already reported the integrated system called SODAS (System Of Design and Assembling for Shipbuilding) which was based on object oriented concept. The aim of previous SODAS was to implement a product model for hull structure. In this paper, an integrated system including pipe laying is discussed. At first, modeling of piping flow from piping diagram to assembling is shown. And then, modeling of laying pipes in hull structures is also discussed. By using modeling of piping flow and modeling of laying pipes, a product model including hull structures and pipes is implemented.