My company is working on a project to develop a methodology of accurately measuring the wetted surface on the upper spring line of a large (i.e., 130’ diameter) cylindrical metal container with a domed top; that is, the spring line represents the departure or aperture of the domed top to the vertical sides of the cylinder. There will be a water source delivering 400-500 gallons per minute on the top of the dome, when required to keep the container cool. The measurement of the wetted surface is to ensure that the water distribution system on the dome is effective at covering the required amount of surface to meet the design cooling requirements. The desired measurement technique/methodology needs to be low tech, and repeatable. I am looking for a coating or paint that could be applied at the spring line, which when wet, changes color and when dry or drier, changes back.
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