Abstract: A tank for transporting liquids, having a baffle system for control of liquid surges produced by acceleration of the tank in transit. Large cylindrical hollow baffles, parallel to the longitudinal tank axis, are mounted between transverse support partitions, the entire assembly being rigidly attached to the walls of the tank vessel. Small relief holes in the cylindrical baffles allow the liquid level in the baffles to change as the tank is filled or drained. Transverse liquid surges are controlled by the cylindrical baffles, which prevent surging of the liquid contained within the baffles, while deflecting and dissipating wave motion and surges of liquid outside the baffles. Longitudinal surges are controlled by the transverse support partitions.