In-Tank Density Determination Revisited

This paper presents the results for two sets of tank calibration runs which again established the feasibility ofin-tank determination of the density of nuclear process solutions in the field with a precision competitive with that claimed for laboratory determinations of the density of samples taken from a tank. Density was inferred from the differential pressure measured between two bubbler probes immersed in fluid at different heights in the tank. The first set of runs in water provided a calibration factor with a relative standard error of 0.0093%, which was used to infer the density of 2% nitric acid solutions in the same tank. The relative standard errors for four nitric acidsolution runswereO.011%, 0.012%, 0.099, andO.0073%.