In this paper, we proposed two wheeled-type in-pipe modular robotic systems. These modular systems are composed of driving modules (which use mechanisms with articulated elements) and passive modules. The first module (driving module) generates the traction force. The passive module is necessary to carry the control electronic equipment and for the transport of the needed equipment for realization of the in-pipe inspection. The joint disposed (universal join) by the two modules of the robot offers the capacity of orientation of this one.