The Ultra High Pressure Water Jet Coating Removal system uses supersonic jet(s) of water to completely remove tenaciously adhered coatings and debris from almost any part or substrate. It is differentiated from more conventional water cleaning techniques by much higher pressures which require unique pump, hydraulic and control systems. In the case of coatings, the water jet hits the surface with such a force that the coating fractures, spalls, and erodes without causing part damage. In the case of other contamination, the jet enters the smaller holes and crevices to remove all contamination. The energy in the supersonic water jet stream is provided by an intensifier that pumps water pressure in the range of 40,000 to 60,000 psi through one or more small diameter orifices.Removal alternatives are briefly discussed, however the papers major emphasis is in the characterization of the process for removing thermally sprayed coating on jet engine parts. The performance of various nozzle designs are discussed along with system requirement.