Pressure is no longer predetermined as a test parameter. Instead, the power density of the flushing jet is used. Pressure is a parameter very prone to rapid variation. There are local losses between pressure measurement and the nozzle insert. Differences in manufacturing (also within the tolerance limits) already result in varying pressure curve progressions. In contrast, the flow rate is regarded as non-varying in the entire system, because water is practically incompressible.

Other tolerances can be found in the diameters of the nozzle inserts, but they are offset by presetting the power density of the flushing jet. For the actual existing nozzle diameter and the given flushing jet power density, the associated flow rate that has to be kept during the entire test is calculated taking into account the jet angle. This approach ensures the achievement of reproducible results.

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