A series of test has been carried out on the lining to cast iron pipes. In this series jets of different shape and pressure were directed at the lining surface for a one-minute time frame, at varying angles of attack. Based on the results of these tests it was found that even the lowest pressure could induce some damage, but that this damage was exacerbated when the jet angle was aimed directly perpendicular to the surface. In addition damage was significantly increased when the jets impacted perpendicular to the surface, and was reduced as this angle of impact was lowered, bringing the jet attack closer to the axis of the pipe. © BHR Group 2008 Water Jetting 19.