Abstract: A method is provided for inspecting a tank for fluid media with an inspection device which records measurement data inside the tank on a base, a wall and/or any upper boundary of the tank. The inspection device is introduced into the tank through an access opening from a sluice chamber of a sluice device which is pre-connected to the tank through a sluice entrance after the access opening has been opened. The inspection device is adapted to the conditions present in the tank, and is transferred back into the sluice device after the measurement data have been recorded.

Abstract: A pig is provided for use in pipelines filled with a flowing fluid. The pig includes a pig body, a drive element which may be a propeller disposed on said pig body which can be rotated by the flowing fluid. The pig also includes a generator unit connected to the drive element through which a movement of the drive element may be converted into electrical energy, and a locking means through which the position and/or the speed of the pig inside the pipeline may be fixed. The generator unit is designed to operate as a motor through which the drive element may be made to rotate and which is designed to set a speed for the pig that is different from the flow velocity of the flowing fluid inside the pipeline and that the pig is provided with an energy storage unit for electrical energy, which is connected to the generator unit.

Abstract: A pig for pipelines, in particular in the form of a cleaning or inspection pig, with a central unit and at least one, in the longitudinal direction of the central unit, front and one rear sealing unit. The pig also includes at least one sensor device comprising a plurality of sensor arms, which is provided in particular for the measurement of a geometry or condition of the pipeline. At least one of the sealing units and preferentially the central unit are produced from a plastic material at least in sections. At least one sensor arm, distant from the central unit, is connected to one of the sealing units.

Abstract: A pig for pipelines, in particular in the form of a cleaning or inspection pig, with a central unit and at least one, in the longitudinal direction of the central unit, front and one rear sealing unit. The pig also includes at least one sensor device comprising a plurality of sensor arms, which is provided in particular for the measurement of a geometry or condition of the pipeline. At least one of the sealing units and preferentially the central unit are produced from a plastic material at least in sections. At least one sensor arm, distant from the central unit, is connected to one of the sealing units.